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Defect Atlas — Sculpture & Monuments

A practical guide to recognising and describing common conditions and defects encountered on sculpture, monuments, memorials, carved elements, commemorative structures, plinths, bases, inscriptions and associated settings during conservation surveys.

Using this volume

This volume of the Defect Atlas is a recognition and description aid for surveyors recording sculpture, monuments, memorials, carved elements, commemorative structures, plinths, bases, inscriptions and their immediate settings. It supports consistent terminology and cautious observation, not diagnosis, treatment or specification.

The atlas helps users:

  • recognise common conditions encountered on sculpture and monuments;
  • describe what is visible in clear, neutral language;
  • avoid unsupported diagnosis of cause, severity or urgency;
  • identify situations where specialist conservation, sculpture or structural review may be appropriate.

The atlas does not:

  • confirm causes of deterioration, movement or loss;
  • prescribe cleaning, repair, consolidation, relocation or replacement;
  • replace material testing, monitoring or instrumented investigation;
  • replace specialist conservation, sculpture, masonry or structural engineering advice.
Where this sits

A practical survey resource, not a terminology reference

The Defect Atlas is part of Survey Resources — practical guides that support recording in the field. It is not part of the Reference Library, which holds curated terminology and material definitions, and it is separate from project-specific references held within individual projects.

Defect categories

Entries are grouped informally under the broad themes below. Many conditions span more than one theme; record what is observed rather than forcing a single category.

  • Surface loss and weathering (8)

    Loss of original surface, modelling and tooling on carved or cast sculptural fabric, including erosion, granular disintegration, sugaring, scaling and flaking.

  • Cracking and fracture (6)

    Linear discontinuities through sculptural fabric, ranging from hairline cracks to open fractures and detached or missing fragments.

  • Structural stability (5)

    Visible indicators that a monument, sculpture or its plinth may be moving, leaning, displaced or no longer securely seated.

  • Biological growth and deposits (5)

    Colonisation by lichen, algae, moss and higher plants, together with bird guano and other biological deposits on sculptural and commemorative fabric.

  • Staining and environmental soiling (6)

    Atmospheric soiling, black crust, water run-off staining, metallic staining and salt-related discolouration on sculpture, monuments and adjacent fabric.

  • Inscriptions and carved detail (5)

    Conditions affecting legibility and integrity of inscriptions, lettering, carved ornament, applied lettering and decorative finishes.

  • Previous repairs and fills (6)

    Earlier interventions visible in the fabric, including fills, adhesive repairs, replacement elements, cleaning effects and incompatible repair materials.

  • Metal fixings and armatures (4)

    Conditions associated with embedded dowels, cramps, armatures and external fixings, including corrosion staining and damage around the fixing zone.

  • Setting, plinth and base issues (5)

    Conditions at the plinth, base, surround and immediate setting, including bedding failure, ground level change, vegetation and water management.

  • Visitor, impact and accidental damage (6)

    Damage associated with visitor contact, accidental impact, graffiti, candle and wax deposits, and public safety observations at accessible monuments.

Individual defect entries

56 entries. Use cautious language throughout: describe what is visible, and reserve interpretation for sections explicitly identified as such.

Surface loss and weathering

Surface erosion

Description

General loss of the original worked surface across an area of the sculpture or monument.

Typical appearance

Rounded, recessed or roughened surface; loss of tooling marks, drapery folds or modelling crispness compared with sheltered areas.

Possible contributing factors

Prolonged weathering, rainwater run-off pathways and exposure orientation can be associated.

Recording prompts
  • extent of erosion across the figure or element
  • comparison between exposed and sheltered surfaces
  • approximate depth of loss where measurable
  • any associated loss of carved or modelled detail
Example observation wording

Surface erosion was recorded across the upward-facing surfaces of the figure, with loss of original tooling and softening of drapery folds.

Granular disintegration

Description

Loss of surface coherence with grains of material detaching or readily dislodged.

Typical appearance

Friable, sandy or powdery surface; loose granules visible on horizontal surfaces and at the base.

Possible contributing factors

Weathering of the binder, salt activity and moisture cycling can be associated.

Recording prompts
  • extent of friable surface
  • presence of detached grains at the base or on ledges
  • areas of locally sound material adjacent
  • any apparent association with damp or salt deposits
Example observation wording

Granular disintegration was observed on the lower part of the torso, with loose grains accumulating on the plinth below.

Specialist review prompt

Consider specialist review where granular disintegration is extensive, progressive or affecting carved detail of cultural significance.

Sugaring

Description

Fine-scale loss of surface coherence producing a granular, sugar-like texture on certain marbles and crystalline stones.

Typical appearance

Matt, granular surface with loss of polish and modelling crispness; fine crystals visible at close range.

Possible contributing factors

Thermal cycling, atmospheric exposure and inherent mineralogy of crystalline stones can be associated.

Recording prompts
  • extent of sugared surface relative to sound areas
  • loss of polish or original finish
  • presence on exposed compared with sheltered faces
  • any associated loss of carved detail
Example observation wording

Sugaring was recorded on exposed marble surfaces of the figure, with associated loss of polish and softening of facial features.

Specialist review prompt

Consider specialist review where sugaring affects significant carved detail or appears to be progressing.

Scaling

Description

Loss of thicker surface layers, often as discrete plates lifting from the underlying body.

Typical appearance

Detached or detaching plates of material, sometimes with hollow-sounding surfaces and visible cavities behind.

Possible contributing factors

Salt crystallisation behind the surface, moisture cycling and the presence of a denser weathering crust can be associated.

Recording prompts
  • size and thickness of scales
  • whether scales remain partly attached
  • presence of cavities or voids behind the surface
  • any associated salt deposits
Example observation wording

Scaling was observed on the lower drapery, with detached plates up to 5 mm thick and a hollow sound on light tapping in adjacent areas.

Specialist review prompt

Consider specialist review where scaling is extensive or where detachment appears imminent on significant carved areas.

Flaking

Description

Detachment of thin surface layers from the body of the sculpture or monument.

Typical appearance

Thin, lifting or detached flakes; freshly exposed body visible beneath where flakes have been lost.

Possible contributing factors

Moisture cycling, salt activity and surface weathering of the original skin can be associated.

Recording prompts
  • extent of flaking across the element
  • thickness of flakes where visible
  • presence of detached fragments at the base
  • any concentration in a particular orientation
Example observation wording

Flaking was recorded across the upper face of the pediment, with thin scales typically 1–2 mm thick.

Delamination

Description

Separation of the surface from the underlying body along an internal plane within the material.

Typical appearance

Visible internal separation, hollow-sounding areas, sometimes stepped loss exposing successive layers.

Possible contributing factors

Bedding planes within the original stone, prolonged moisture exposure and freeze–thaw action can be associated.

Recording prompts
  • extent and orientation of delaminated areas
  • whether delamination follows bedding planes
  • depth of separation where visible
  • presence of associated cracking
Example observation wording

Delamination was observed on the rear of the figure, with separation extending approximately 120 mm along a horizontal plane.

Specialist review prompt

Consider specialist review where delamination affects load-bearing elements or significant sculpted detail.

Pitting

Description

Small, discrete cavities in the surface, isolated or clustered, sometimes obscured by deposits.

Typical appearance

Pinpoint to small-diameter pits across the surface, sometimes with associated darkening or staining.

Possible contributing factors

Selective weathering of softer inclusions, atmospheric pollutants and salt activity can be associated.

Recording prompts
  • distribution and approximate density of pits
  • size range of pits
  • presence on particular faces or materials
  • any associated soiling within the pits
Example observation wording

Pitting was recorded across the polished surfaces of the granite plinth, with clustered pits 1–3 mm in diameter.

Softened modelling

Description

Loss of crispness in modelled or carved surfaces such that original detail is reduced in definition.

Typical appearance

Rounded edges to drapery, hair, features or ornament; loss of tooling and carving marks; overall less defined silhouette.

Possible contributing factors

Long-term weathering, cleaning history and surface loss processes can be associated.

Recording prompts
  • elements most affected by loss of definition
  • comparison with sheltered or recently cleaned areas
  • approximate depth of surface lost
  • evidence of progressive change since earlier records
Example observation wording

Softened modelling was observed on the facial features of the figure, with loss of definition to the eyes, mouth and surrounding modelling.

Cracking and fracture

Hairline cracking

Description

Fine cracks visible at close range but with no measurable opening.

Typical appearance

Thin linear marks, sometimes following bedding or veining, occasionally with associated staining.

Possible contributing factors

Thermal cycling, minor movement and inherent weaknesses in the material can be associated.

Recording prompts
  • location and orientation of cracks
  • approximate length
  • whether cracks appear stable or open at any point
  • any associated staining indicating moisture pathways
Example observation wording

Hairline cracking was recorded across the right shoulder of the figure, extending approximately 80 mm and following the original bedding plane.

Open cracking

Description

Cracks with a measurable opening across part or all of their length.

Typical appearance

Visible linear gap, sometimes with vegetation, debris or salt deposits within, occasionally with associated staining.

Possible contributing factors

Past movement, freeze–thaw action, internal corrosion of embedded metal and impact can be associated.

Recording prompts
  • length and approximate width of crack
  • whether the crack passes through to the rear face where visible
  • presence of debris, vegetation or salts within the crack
  • any associated displacement at the crack
Example observation wording

Open cracking was observed across the upper drapery, with a crack approximately 220 mm long and up to 2 mm wide at its centre.

Specialist review prompt

Consider specialist review where open cracking is extensive, follows fixing locations or appears to be progressing.

Fracture

Description

A discontinuity passing through the full thickness of an element such that the fabric is divided.

Typical appearance

Distinct break running through the section, sometimes with associated displacement or earlier repair material at the join.

Possible contributing factors

Impact, internal stress, embedded metal corrosion and earlier failed repairs can be associated.

Recording prompts
  • location and orientation of fracture
  • evidence of displacement across the fracture
  • presence of any earlier repair at the fracture
  • whether the fracture is supported by adjacent fabric
Example observation wording

A fracture was recorded through the right arm of the figure, with the lower portion supported by an earlier metal pin visible at the join.

Specialist review prompt

Consider specialist conservation review for any fracture through a sculptural element, particularly where embedded fixings or significant carving are affected.

Spalling

Description

Detachment of a discrete piece of material leaving a recessed area exposing fresh fabric.

Typical appearance

Localised cavity with relatively fresh-looking exposed material; sometimes with detached fragment nearby.

Possible contributing factors

Frost action, salt crystallisation, internal corrosion of fixings and inherent weaknesses can be associated.

Recording prompts
  • size and depth of spalled area
  • whether the detached fragment survives
  • any associated cracking radiating from the spall
  • presence of corroded metal at the spall location
Example observation wording

Spalling was recorded at the base of the column, with a loss approximately 80 mm across and 30 mm deep adjacent to an embedded iron cramp.

Specialist review prompt

Consider specialist review where spalling is associated with embedded metalwork or affects load-bearing or commemorative elements.

Detached fragment

Description

A piece of original fabric that has separated from the element but remains on or near the monument.

Typical appearance

Loose fragment resting on a ledge, the plinth or the ground; recess in the original element from which it has come, where identifiable.

Possible contributing factors

Cracking, fracture, impact, fixing failure and weathering of bedding can be associated.

Recording prompts
  • location, size and weight of fragment
  • matching recess on the parent element if identifiable
  • condition of the fragment and the exposed surface
  • whether the fragment is in a position posing safety concerns
Example observation wording

A detached fragment was recorded resting on the plinth, approximately 150 mm long, matching a recess on the lower drapery of the figure.

Specialist review prompt

Consider specialist review for any detached fragment, particularly where original to a sculpted element of significance.

Missing fragment

Description

An area of original fabric that has been lost and is no longer present at the monument.

Typical appearance

Recessed area, sometimes with relatively fresh fracture surfaces; absence of an element visible in earlier records.

Possible contributing factors

Past damage, vandalism, theft and uncollected detached fragments can be associated.

Recording prompts
  • location, size and apparent character of the lost area
  • comparison with earlier photographs or records if available
  • evidence of the timing of loss from fracture surface condition
  • any safety implications of the loss
Example observation wording

A missing fragment was recorded at the tip of the sceptre, with a fracture surface showing weathering consistent with longer-standing loss.

Structural stability

Leaning monument

Description

Departure of the monument from vertical or from its intended alignment.

Typical appearance

Visible tilt of the shaft, figure or assembly; opening of joints on one side; departure from adjacent vertical features.

Possible contributing factors

Ground movement, base failure, bedding loss, root action and ground level change can be associated.

Recording prompts
  • direction and approximate angle of lean where measurable
  • comparison with adjacent vertical features
  • evidence of associated joint opening or base displacement
  • any indication of recent change
Example observation wording

A leaning monument was recorded, with the shaft approximately 25 mm out of plumb to the south at the head, and an associated open joint on the north side of the base.

Specialist review prompt

Consider specialist structural review for any leaning monument, particularly where the lean is significant, progressive or in a publicly accessible location.

Displaced element

Description

An element of the assembly that has moved from its original position.

Typical appearance

Visible offset between adjacent components, overhanging or stepped profile, opening at the original bedding line.

Possible contributing factors

Movement of bedding, impact, fixing failure and ground movement can be associated.

Recording prompts
  • element affected and direction of displacement
  • approximate offset where measurable
  • associated condition of bedding and fixings where visible
  • any safety implications
Example observation wording

A displaced element was recorded at the upper cornice, with one section offset approximately 15 mm to the east from the adjacent stones.

Specialist review prompt

Consider specialist review for any displaced element, particularly where the displacement affects stability or safety.

Unstable plinth indicator

Description

Visible signs that the plinth or base may no longer be securely seated.

Typical appearance

Open joint at the plinth bed, visible movement when assessed at safe distance, gaps between plinth and surround, displaced cover stones.

Possible contributing factors

Failed bedding mortar, ground movement, root action, water washout and earlier disturbance can be associated.

Recording prompts
  • evidence of opening at the plinth bed and its extent
  • presence of debris or vegetation within open joints
  • any indication of recent movement
  • condition of surrounding paving or ground
Example observation wording

An unstable plinth indicator was recorded as an open joint at the bed of the plinth, approximately 6 mm wide along the north face.

Specialist review prompt

Consider specialist structural and conservation review for any monument where plinth stability is uncertain, before further close inspection or any contact.

Open joint at base

Description

Visible separation at the bedding joint between the monument and its base or surround.

Typical appearance

Linear gap at the junction, sometimes with debris, vegetation or water within.

Possible contributing factors

Loss of bedding mortar, ground movement, freeze–thaw cycling and earlier disturbance can be associated.

Recording prompts
  • length and width of open joint
  • extent around the perimeter
  • presence of debris, vegetation or water
  • any evidence of associated movement above
Example observation wording

An open joint at the base was recorded along the south face of the plinth, approximately 4 mm wide and extending for 400 mm.

Failed bedding at plinth

Description

Visible loss or breakdown of the bedding mortar between plinth components.

Typical appearance

Voids, missing mortar, friable or eroded mortar visible at the bedding joint; sometimes with debris washed out below.

Possible contributing factors

Original mortar weathering, salt activity, freeze–thaw and water ingress can be associated.

Recording prompts
  • extent of missing or friable mortar
  • depth of loss where visible
  • any associated movement between components
  • presence of moisture or staining at the joint
Example observation wording

Failed bedding at the plinth was recorded along the east face, with mortar lost to a depth of approximately 30 mm over a length of 600 mm.

Specialist review prompt

Consider specialist masonry and conservation review where bedding failure affects stability or where significant lengths of bedding are no longer effective.

Biological growth and deposits

Lichen colonisation

Description

Colonisation of stone or other sculptural surfaces by lichens of varying colour and habit.

Typical appearance

Patches of crustose, foliose or fruticose lichen in white, grey, yellow, orange or black, often following exposure patterns.

Possible contributing factors

Atmospheric conditions, surface texture, orientation and moisture availability can be associated.

Recording prompts
  • approximate extent of colonisation
  • types of lichen where identifiable
  • areas of original surface obscured
  • any apparent association with surface change beneath
Example observation wording

Lichen colonisation was recorded across the upper surfaces of the monument, with mixed crustose and foliose lichens covering approximately 30% of the assessable area.

Algae staining

Description

Discolouration of surfaces by algal growth, typically appearing as green or dark patches.

Typical appearance

Green, dark green or black film, often on shaded or persistently damp surfaces; sometimes following water run-off pathways.

Possible contributing factors

Sustained moisture, sheltered orientation and proximity to vegetation can be associated.

Recording prompts
  • extent and location of staining
  • relationship to water run-off pathways
  • comparison between damp and dry areas
  • any apparent association with surface change
Example observation wording

Algae staining was recorded on the north face of the plinth, forming a dark green film below the cornice drip line.

Moss growth

Description

Establishment of mosses on horizontal surfaces, in joints or within recesses.

Typical appearance

Cushioned or matted green growth on ledges, within joints and at the base; sometimes with associated debris retention.

Possible contributing factors

Moisture retention, sheltered orientation and debris accumulation can be associated.

Recording prompts
  • location and extent of moss growth
  • depth of any organic mat
  • associated water retention
  • any apparent effect on the substrate or joint
Example observation wording

Moss growth was recorded along the upper edge of the plinth, with a continuous mat retained on the horizontal surface.

Higher plant growth

Description

Growth of grasses, herbs, shrubs or self-seeded saplings on or immediately around the monument.

Typical appearance

Visible plant material rooted in joints, at the plinth bed or in surrounding paving; sometimes with associated displacement.

Possible contributing factors

Debris accumulation in joints, soil ingress and lack of maintenance can be associated.

Recording prompts
  • species or growth habit where identifiable
  • location and rooting position
  • evidence of root-related displacement
  • any associated joint opening
Example observation wording

Higher plant growth was recorded at the bedding joint of the plinth, with a self-seeded buddleia rooted in a partly open joint on the east face.

Specialist review prompt

Consider specialist review where established plant growth appears to be displacing fabric or where removal would risk loss of historic material.

Bird guano deposit

Description

Accumulation of bird droppings on sculpted or commemorative surfaces.

Typical appearance

White, grey or dark streaked and crusted deposits on heads, shoulders, upturned surfaces and ledges; sometimes with associated staining and surface change beneath.

Possible contributing factors

Bird perching, nesting and roosting habits and lack of deterrent features can be associated.

Recording prompts
  • extent and location of guano
  • depth of accumulation where visible
  • any associated surface change beneath
  • presence of nesting evidence
Example observation wording

Bird guano deposit was recorded across the head and shoulders of the figure, with a continuous crusted layer up to 4 mm thick.

Specialist review prompt

Consider specialist review where significant guano accumulation may be associated with surface change to historic carving.

Staining and environmental soiling

Atmospheric soiling

Description

Accumulation of airborne particulates on sculptural and commemorative surfaces.

Typical appearance

Grey to dark grey deposit on sheltered surfaces and within recesses; loss of original tone, with cleaner areas where rainwater washes the surface.

Possible contributing factors

Atmospheric pollution, traffic exposure, sheltered orientation and lack of cleaning can be associated.

Recording prompts
  • extent and distribution of soiling
  • relationship to rainwater wash pattern
  • areas of cleaner surface for comparison
  • any associated obscuring of inscription or detail
Example observation wording

Atmospheric soiling was recorded on the sheltered face of the monument, with a dark grey deposit obscuring tooling marks and reducing legibility of carved detail.

Black crust

Description

Hard, dark crust forming on sheltered surfaces, typically composed of accumulated particulates and reaction products.

Typical appearance

Black or dark grey crust, sometimes raised above the surface, often on undercuts and under cornices; cleaner areas where rainwater reaches the surface.

Possible contributing factors

Atmospheric pollution, sustained sheltering from rainwater and surface chemistry of the substrate can be associated.

Recording prompts
  • extent and thickness of crust
  • relationship to sheltered geometry
  • presence of underlying surface change where crust is detaching
  • any cracking, lifting or detachment of the crust
Example observation wording

Black crust was recorded under the cornice of the pediment, with raised areas up to 2 mm thick and localised detachment exposing scaled stone beneath.

Specialist review prompt

Consider specialist conservation review for any cleaning of black crust on sculpted surfaces, particularly where surface change beneath is suspected.

Water run-off staining

Description

Discolouration following the pathways of rainwater across the monument.

Typical appearance

Vertical or diagonal streaks of darker or lighter discolouration following run-off pathways below drip points and joints.

Possible contributing factors

Rainwater pathways, dissolved material from above, atmospheric soiling and surface chemistry can be associated.

Recording prompts
  • location and direction of staining
  • source of run-off where identifiable
  • extent of affected area
  • any associated surface change
Example observation wording

Water run-off staining was recorded below the upper cornice, with dark vertical streaks extending down the face of the plinth.

Iron staining from fixings

Description

Orange-brown discolouration in the area around an embedded or surface ferrous fixing.

Typical appearance

Orange, brown or rust-coloured staining on the substrate, often emanating from a fixing point or following a crack line.

Possible contributing factors

Corrosion of embedded iron or steel cramps, dowels or pins and moisture pathways can be associated.

Recording prompts
  • location of staining and probable source
  • extent and intensity of colour
  • any associated cracking around the fixing
  • evidence of fixing exposure at the surface
Example observation wording

Iron staining from fixings was recorded around an embedded cramp at the upper joint, with an orange-brown halo approximately 80 mm across.

Specialist review prompt

Consider specialist review where iron staining is associated with cracking, spalling or any sign of expansion of the embedded fixing.

Copper staining from adjacent metal

Description

Green or blue-green discolouration on stone or other fabric below copper, bronze or brass elements.

Typical appearance

Green to blue-green streaks or patches below bronze sculptural elements, copper finials, brass plaques or other non-ferrous components.

Possible contributing factors

Rainwater run-off carrying dissolved corrosion products from non-ferrous metal above can be associated.

Recording prompts
  • source of staining and run-off pathway
  • extent and intensity of staining
  • condition of the metal element above
  • any associated surface change to the substrate
Example observation wording

Copper staining from adjacent metal was recorded below the bronze plaque, with green-blue streaks extending down the polished granite of the plinth.

Salt efflorescence

Description

Crystalline salt deposits on the surface of the monument.

Typical appearance

White or pale crystalline crusts, fluffy deposits or fine veiling on the surface, sometimes seasonal.

Possible contributing factors

Soluble salts in the masonry, groundwater, de-icing salts and atmospheric inputs can be associated with deposition through moisture cycling.

Recording prompts
  • location and extent of deposits
  • appearance of the underlying surface
  • any seasonal variation if known
  • presence of associated surface loss
Example observation wording

Salt efflorescence was recorded along the base of the plinth, with intermittent white crystalline deposits up to 300 mm above ground level.

Specialist review prompt

Consider specialist investigation where salt efflorescence is persistent or associated with surface deterioration of sculpted material.

Inscriptions and carved detail

Loss of carved detail

Description

Reduction or loss of original carved or modelled ornament across the monument.

Typical appearance

Softened, partly lost or unreadable carved enrichment, ornament or figurative detail; comparison with earlier records reveals reduction.

Possible contributing factors

Long-term weathering, surface loss processes and cleaning history can be associated.

Recording prompts
  • elements of detail most affected
  • comparison with earlier records where available
  • depth of loss relative to original profile
  • any concentration on particular exposures
Example observation wording

Loss of carved detail was recorded on the floral ornament of the cornice, with original modelling reduced to a softened profile across the south face.

Loss of inscription legibility

Description

Reduction in the readability of an inscription on the monument.

Typical appearance

Shallowed, worn or partly lost letterforms; obscured letters within soiled, eroded or biologically colonised areas.

Possible contributing factors

Weathering, surface loss, soiling and biological colonisation can be associated.

Recording prompts
  • location of affected inscription
  • extent of illegibility (single letters, words, lines)
  • depth of remaining letter strokes where measurable
  • any earlier transcript or photograph available
Example observation wording

Loss of inscription legibility was recorded on the south face of the plinth, with the final two lines partly illegible due to combined surface erosion and lichen colonisation.

Specialist review prompt

Consider specialist recording of any inscription approaching illegibility before further loss, including raking light photography and where appropriate, conservation advice.

Inscription infill loss

Description

Loss of original pigment, lead, paint or applied infill from incised letterforms.

Typical appearance

Partly or wholly empty letter recesses, with traces of original infill surviving in some characters; reduced contrast against the stone.

Possible contributing factors

Weathering, cleaning history and original material durability can be associated.

Recording prompts
  • extent of infill loss across the inscription
  • evidence of original infill material
  • letters retaining most legibility
  • any associated soiling within recesses
Example observation wording

Inscription infill loss was recorded across the dedication panel, with original lead infill surviving in only the upper letters of the first line.

Paint or gilding remnant loss

Description

Loss of historic painted or gilded finish from inscriptions, mouldings or carved enrichment.

Typical appearance

Patchy survival of paint or gilding in sheltered recesses, with bare stone or substrate across exposed areas.

Possible contributing factors

Weathering, cleaning, surface loss beneath and ageing of the finish can be associated.

Recording prompts
  • extent and location of surviving finish
  • colour, type and condition of remnants
  • evidence of multiple historic schemes
  • vulnerability of remaining traces
Example observation wording

Paint or gilding remnant loss was recorded on the carved coat of arms, with traces of red and gilded finishes surviving only within the deeper recesses.

Specialist review prompt

Consider specialist conservation review before any cleaning or repair where historic paint or gilding traces survive.

Applied lettering loss

Description

Loss of applied bronze, lead, ceramic or other letters or fixings from a dedication or inscription.

Typical appearance

Empty fixing holes, ghost outlines of former letters, partial survival of some characters; sometimes with detached letters retained on site.

Possible contributing factors

Fixing corrosion, vandalism, theft and weathering can be associated.

Recording prompts
  • letters or elements missing
  • evidence of fixing holes and their condition
  • presence of detached letters retained nearby
  • any associated staining at fixings
Example observation wording

Applied lettering loss was recorded on the dedication, with five of the bronze letters missing and matching fixing holes visible in the stone.

Previous repairs and fills

Previous fill failure

Description

Earlier mortar, resin or composite fill that is no longer performing as intended.

Typical appearance

Cracking, shrinkage, detachment or partial loss of the fill; visible gap at the interface with original fabric.

Possible contributing factors

Material incompatibility, original workmanship, weathering and movement can be associated.

Recording prompts
  • location and extent of fill
  • type and apparent age of the repair where assessable
  • nature of the failure (cracking, detachment, loss)
  • condition of adjacent original fabric
Example observation wording

A previous fill failure was recorded on the lower drapery, with a mortar repair cracked across its width and partly detached at the interface with the original stone.

Incompatible repair mortar

Description

Repair mortar that appears denser, harder or more impervious than the original substrate.

Typical appearance

Repair material standing proud or sharply defined against the substrate, often with associated damage to the adjacent original at the interface.

Possible contributing factors

Use of cementitious or hard proprietary mortars on softer historic substrates can be associated.

Recording prompts
  • location and extent of repair
  • appearance and apparent hardness compared with substrate
  • any associated damage to adjacent original
  • evidence of multiple historic repair campaigns
Example observation wording

Incompatible repair mortar was recorded on the upper plinth, with a hard grey patch standing slightly proud of the surrounding stone and associated erosion at the adjacent original surface.

Specialist review prompt

Consider specialist conservation review before any modification of earlier repairs, particularly where removal could damage adjacent original fabric.

Inappropriate adhesive repair

Description

Earlier adhesive bond, often resin-based, used to reattach detached fragments or close cracks.

Typical appearance

Visible glue lines, discoloured residues, sometimes with associated staining of adjacent fabric.

Possible contributing factors

Past use of resins or adhesives not specified for the substrate or exposure conditions can be associated.

Recording prompts
  • location and extent of adhesive repair
  • appearance of the bond and any associated discolouration
  • evidence of failure or movement at the join
  • any associated staining of adjacent material
Example observation wording

An inappropriate adhesive repair was observed at the join of the right arm, with a yellowed resin bead visible along the joint and associated darkening of the adjacent stone.

Specialist review prompt

Consider specialist conservation review of any earlier adhesive repair on sculpted fabric, especially where the bond appears to be ageing or staining the substrate.

Replacement element

Description

A component of the monument that has been replaced with new material in an earlier intervention.

Typical appearance

Differing material, tooling or weathering compared with adjacent original; visible joint at the interface with surviving fabric.

Possible contributing factors

Past damage, programmed maintenance and phased replacement of failed elements can be associated.

Recording prompts
  • location and extent of replacement
  • comparison of material and tooling with original
  • condition of the replacement and the joint
  • any documentation of the earlier intervention
Example observation wording

A replacement element was recorded at the upper cornice, with a single section of differing tooling and slightly varied stone bedded in cementitious mortar.

Overcleaned surface

Description

Areas where earlier cleaning appears to have removed original surface beyond accumulated soiling.

Typical appearance

Pale, abraded or unusually smooth surface, sometimes with sharp transitions to less cleaned areas; loss of tooling crispness in cleaned zones.

Possible contributing factors

Earlier use of inappropriate cleaning methods or abrasive techniques can be associated.

Recording prompts
  • extent and location of affected surface
  • comparison with adjacent uncleaned areas
  • evidence of tool or media marks
  • any associated loss of carved detail
Example observation wording

An overcleaned surface was recorded across the lower plinth, with a pale, abraded appearance and visible loss of original tooling along an irregular boundary.

Specialist review prompt

Consider specialist conservation review before any further cleaning, where evidence suggests earlier cleaning has affected original surface.

Abrasive cleaning marks

Description

Visible patterns left by abrasive media or mechanical cleaning equipment.

Typical appearance

Linear, circular or stippled patterns on the surface; loss of original tooling; sometimes with a slight halo at the boundary of treated areas.

Possible contributing factors

Past use of grit blasting, mechanical brushing or other abrasive techniques can be associated.

Recording prompts
  • type of pattern observed
  • extent and orientation across the element
  • loss of original tooling within affected areas
  • any associated change in colour or texture
Example observation wording

Abrasive cleaning marks were recorded across the rear of the plinth, with a stippled pattern consistent with earlier grit blasting and associated loss of fine tooling.

Metal fixings and armatures

Metal dowel corrosion indicator

Description

Visible evidence that an embedded metal dowel or pin may be corroding within the fabric.

Typical appearance

Linear iron staining, localised cracking, spalling or surface lift in the area of a known or suspected fixing.

Possible contributing factors

Embedded ferrous fixings, water ingress and incompatible bedding can be associated.

Recording prompts
  • location and apparent extent of staining or cracking
  • relationship to known fixing positions if recorded
  • evidence of associated movement or spall
  • presence of moisture pathways above the affected area
Example observation wording

A metal dowel corrosion indicator was recorded as iron staining and a 60 mm crack at the join of the figure to the plinth, consistent with corrosion of an embedded dowel.

Specialist review prompt

Consider specialist conservation and structural review where embedded fixings are suspected of corroding, before any intervention is contemplated.

Armature corrosion staining

Description

Iron staining or surface damage associated with an internal armature or supporting framework.

Typical appearance

Diffuse or linear iron-coloured staining following the apparent route of an armature, sometimes with associated cracking or surface lift.

Possible contributing factors

Internal ferrous armatures, water ingress and breakdown of original protective measures can be associated.

Recording prompts
  • extent and pattern of staining
  • any associated cracking aligned with the armature
  • evidence of expansion or movement
  • history of the element where known
Example observation wording

Armature corrosion staining was recorded along the upper torso of the figure, with a vertical iron stain and an associated hairline crack consistent with an internal supporting member.

Specialist review prompt

Consider specialist conservation review for any sculpture suspected of internal armature corrosion, before further investigation or any contact treatment.

Loss around fixing

Description

Local loss of original material at a fixing point.

Typical appearance

Recessed or broken area immediately around a fixing, sometimes with the fixing partly exposed; associated cracking or spall.

Possible contributing factors

Fixing corrosion, mechanical overload, repeated use of the fixing and weathering can be associated.

Recording prompts
  • location and extent of loss
  • exposure and condition of the fixing
  • any associated cracking
  • implications for security of the fixing
Example observation wording

Loss around a fixing was recorded at the lower bracket, with a 30 mm spall exposing the upper part of a corroded iron cramp.

Specialist review prompt

Consider specialist conservation review where loss around a fixing may compromise the security or stability of a sculpted or commemorative element.

Commemorative plaque loosening

Description

Visible movement of an applied commemorative plaque relative to its host fabric.

Typical appearance

Gap at the perimeter of the plaque, movement when lightly checked at safe distance, associated staining from fixings.

Possible contributing factors

Fixing corrosion, failed bedding, vibration and impact can be associated.

Recording prompts
  • extent and direction of perceived movement
  • condition of visible fixings
  • presence of associated staining
  • any safety implications for visitors
Example observation wording

Commemorative plaque loosening was recorded on the south face, with a gap of approximately 3 mm at the upper edge and visible iron staining at two of the fixings.

Specialist review prompt

Consider specialist review where any commemorative plaque shows signs of loosening, before further handling.

Setting, plinth and base issues

Base vegetation growth

Description

Establishment of grasses, weeds or shrubs against or within the base of the monument.

Typical appearance

Plant growth abutting or rooted in joints at the plinth, sometimes obscuring inscription or carved detail at low level.

Possible contributing factors

Lack of maintenance, soil and debris build-up at the base, and water retention can be associated.

Recording prompts
  • extent and proximity of vegetation to the monument
  • evidence of root penetration into joints
  • any obscuring of inscription or carved detail
  • associated soiling or staining at the base
Example observation wording

Base vegetation growth was recorded around the south and east faces of the plinth, with grass and self-seeded ivy obscuring the lower 200 mm of the inscription panel.

Ground level change around base

Description

Difference between the original and current ground level at the foot of the monument.

Typical appearance

Soil, paving or gravel banked against the base; alternatively, ground lowered away from an originally buried plinth course.

Possible contributing factors

Landscaping changes, accumulated debris, alterations to paving and adjacent groundworks can be associated.

Recording prompts
  • direction and approximate extent of ground level change
  • evidence of originally buried or originally exposed surfaces
  • any associated dampness or staining
  • implications for drainage at the base
Example observation wording

A ground level change around the base was recorded on the north side, with current paving approximately 80 mm above the original plinth chamfer.

Specialist review prompt

Consider specialist review where ground level change appears to be contributing to persistent damp, salts or vegetation issues at the base.

Pooling at base

Description

Evidence of standing water collecting against the base or on associated horizontal surfaces.

Typical appearance

Tide marks, persistent dampness, algal staining, salt deposits and debris accumulation at the base; ponded water observed after rainfall.

Possible contributing factors

Failed drainage, ground level change, settlement of paving and blocked outlets can be associated.

Recording prompts
  • extent and location of evidence of pooling
  • comparison between persistently wet and dry areas
  • associated staining or biological growth
  • condition of any drainage features
Example observation wording

Pooling at the base was indicated by a tide mark approximately 50 mm above paving along the north face of the plinth, with associated algal staining.

Surround paving disturbance

Description

Disturbance, settlement or displacement of paving or kerbs around the monument.

Typical appearance

Uneven, tilted, cracked or missing paving units; trip hazards adjacent to the plinth; gaps between paving and base.

Possible contributing factors

Ground movement, tree root action, vehicle loading and earlier excavation can be associated.

Recording prompts
  • location and extent of disturbed paving
  • evidence of associated movement at the plinth
  • presence of trip hazards or safety concerns
  • any apparent association with vegetation or services
Example observation wording

Surround paving disturbance was recorded on the west side of the monument, with two paving slabs tilted and a 20 mm step formed adjacent to the plinth.

Damp staining at base

Description

Persistent dark or discoloured zone at the base of the monument associated with sustained moisture.

Typical appearance

Darker band of stone along the lower courses, sometimes with associated salt deposits, biological growth or surface change above the paving.

Possible contributing factors

Rising moisture, splash from adjacent paving, blocked drainage and ground level change can be associated.

Recording prompts
  • height and continuity of damp zone
  • associated salts, biological growth or surface loss
  • evidence of moisture pathways
  • any seasonal change if known
Example observation wording

Damp staining at the base was recorded as a continuous darker zone extending approximately 250 mm above paving level around all faces of the plinth.

Specialist review prompt

Consider specialist investigation where persistent damp at the base of a monument is associated with surface loss or salt activity in significant fabric.

Visitor, impact and accidental damage

Visitor abrasion

Description

Wear of original surface associated with repeated visitor contact.

Typical appearance

Polished, lightened or worn zones at handling points, on protruding features, on lower limbs of figures or at accessible inscriptions.

Possible contributing factors

Visitor handling, traditional touching practices and accessibility of features can be associated.

Recording prompts
  • location and extent of worn area
  • comparison with adjacent unworn surface
  • any associated loss of carved detail
  • evidence of progressive wear if known
Example observation wording

Visitor abrasion was recorded on the foot of the figure, with a polished, lightened area approximately 80 mm across and associated softening of the modelling.

Impact chip

Description

A discrete chipped or fractured area resulting from contact or impact.

Typical appearance

Localised loss with relatively fresh fracture surfaces; sometimes with detached fragment retained nearby.

Possible contributing factors

Accidental contact, dropped objects, vehicle proximity and vandalism can be associated.

Recording prompts
  • location, size and depth of chip
  • freshness of fracture surface
  • presence of associated fragments
  • any associated cracking extending beyond the chip
Example observation wording

An impact chip was recorded on the corner of the plinth, approximately 40 mm across and 15 mm deep, with relatively fresh fracture surfaces consistent with recent damage.

Edge loss

Description

Loss of material along the edge or arris of a plinth, cornice or step.

Typical appearance

Rounded, chipped or missing edge; loss of original arris; sometimes with associated cracking.

Possible contributing factors

Repeated contact, weathering, impact and earlier damage can be associated.

Recording prompts
  • location and extent of edge loss
  • depth of loss compared with intended profile
  • any associated cracking
  • evidence of repeated damage in the same area
Example observation wording

Edge loss was recorded along the upper arris of the plinth on the west face, with continuous loss extending approximately 600 mm and chips up to 25 mm into the profile.

Graffiti

Description

Applied marks, writing or images on the monument that are not part of its original or historic fabric.

Typical appearance

Painted, marker, etched or scratched marks; sometimes with associated discolouration of substrate.

Possible contributing factors

Public access, lack of surveillance and prevailing local conditions can be associated.

Recording prompts
  • location, extent and type of graffiti
  • depth where incised or scratched
  • evidence of earlier graffiti or earlier removal attempts
  • any associated surface change
Example observation wording

Graffiti was recorded on the rear of the plinth, comprising spray-painted lettering covering an area approximately 600 mm by 300 mm.

Specialist review prompt

Consider specialist conservation review before any removal of graffiti from historic sculptural surfaces, to avoid damaging original fabric.

Wax or candle staining

Description

Deposits and staining from candles, votive offerings or commemorative practices on or around the monument.

Typical appearance

Wax runs, drips and patches on surfaces; localised darkening or sooting around candle positions; associated debris on plinths and steps.

Possible contributing factors

Commemorative or devotional practices, accessibility and lack of designated provision can be associated.

Recording prompts
  • location and extent of wax deposits
  • associated sooting or staining
  • evidence of repeated practice in the same area
  • any associated surface change
Example observation wording

Wax or candle staining was recorded on the upper step of the monument, with multiple wax runs and a darkened area approximately 200 mm across.

Public safety observation

Description

Observation of a condition with potential implications for the safety of visitors or passers-by.

Typical appearance

Loose or overhanging fragments, sharp broken edges at low level, trip hazards in surrounds, leaning elements in publicly accessible locations.

Possible contributing factors

Loss, displacement, impact, ground change and lack of barrier provision can be associated.

Recording prompts
  • nature and location of the condition
  • accessibility to the public
  • evidence of recent change
  • any temporary measures already in place
Example observation wording

A public safety observation was recorded at the upper cornice, where a fragment appears to be detached at the front edge of a publicly accessible monument.

Specialist review prompt

Consider immediate specialist structural and conservation review for any public safety observation involving loose, displaced or unstable fabric at an accessible monument.

Recording reminders

Describe what is visible. Record the observed condition, its location, extent and any associated evidence before attempting interpretation.

Avoid:

  • diagnosing causes of cracking, staining or loss from surface appearance alone;
  • assuming the integrity of embedded fixings or internal armatures without investigation;
  • describing treatment in a survey observation rather than in a separate recommendation.

Prefer cautious language such as:

  • “observed”, “recorded”, “visible”;
  • “may indicate”, “can be associated with”, “consistent with”;
  • “record whether…”, “consider specialist review where…”.
Specialist review

When to consider specialist review

Many conditions in this volume — including extensive surface loss, open cracking, fracture, detached or missing fragments, leaning or displaced elements, suspected dowel or armature corrosion, persistent salt activity, earlier adhesive or cementitious repairs, loss of inscription legibility and any public safety concern at accessible monuments — warrant qualified conservation, sculpture or structural advice before any cleaning, repair, consolidation or relocation is contemplated. The Responsible Commissioning Guide offers further prompts for determining when specialist review, monitoring or investigation may be appropriate.

Other Defect Atlas volumes

The Defect Atlas currently includes volumes for architectural metalwork, stone, timber, stained glass, paintings, textiles, ceramics & terracotta, plaster, render & stucco, mortars, pointing & joints, roofing & rainwater goods, brickwork & masonry units, and sculpture & monuments. Further volumes may follow.

Related tools

This atlas supports recognition and description only. It does not confirm causes, prescribe treatment, replace material testing or instrumented investigation, and does not replace specialist conservation, sculpture, masonry or structural advice. Where evidence is uncertain, where movement or loss appears active, or where risk to fabric or people is unclear, refer observations to qualified conservators, sculpture specialists or structural engineers before any cleaning, repair, consolidation or relocation is contemplated.