{"id":248290,"date":"2026-09-01T08:41:00","date_gmt":"2026-09-01T07:41:00","guid":{"rendered":"https:\/\/www.marbre-import.fr\/?page_id=248290"},"modified":"2026-09-01T08:41:00","modified_gmt":"2026-09-01T07:41:00","slug":"diagnosis-cracks-chips-breakage-natural-stone","status":"publish","type":"page","link":"https:\/\/www.marbre-import.fr\/en\/natural-stone-encyclopedia\/diagnosis-cracks-chips-breakage-natural-stone\/","title":{"rendered":"Diagnosis: Cracks, Chips and Breakage in Natural Stone"},"content":{"rendered":"

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Home<\/a> \/ Natural Stone Encyclopedia<\/a> \/ Diagnosis: Cracks, Chips and Breakage in Natural Stone<\/strong><\/div>\n
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Diagnosis by Symptom<\/p>\n

Diagnosis: Cracks, Chips and Breakage in Natural Stone<\/h1>\n

Determine whether the damage is confined to the stone or indicates substrate movement, stress, impact, handling damage or a design issue.<\/p>\n

\n Open the interactive tool<\/a>Ask a stone specialist<\/a>\n <\/div>\n<\/p><\/div>\n<\/section>\n
\"Natural<\/a>
Natural stone in a real project \u2014 Diagnosis of cracks, chips and breakage<\/figcaption><\/figure>\n
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Identify the condition before treating it<\/h2>\n

A fine fissure within veining, a full-depth break and a chipped edge do not require the same response. A defect continuing through joints, the substrate or adjacent elements often indicates movement in the construction rather than an isolated weakness in the stone.<\/p>\n

Before filling anything, record the length, opening, orientation, level difference and development over time. A cosmetic repair applied to an active crack will reopen and may conceal evidence needed for structural diagnosis.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Observed sign<\/th>\nWhat it may indicate<\/th>\nFirst action<\/th>\n<\/tr>\n<\/thead>\n
Crack extending from a joint or across several slabs<\/td>\nSubstrate movement or a missing movement joint<\/td>\nSuspend cosmetic repair<\/td>\n<\/tr>\n
Clean chip on an exposed corner<\/td>\nImpact, handling or an overly vulnerable edge profile<\/td>\nMake the edges safe<\/td>\n<\/tr>\n
Crack following a natural vein<\/td>\nA weakness plane under stress<\/td>\nAssess thickness, reinforcement and span<\/td>\n<\/tr>\n
Break with a change in level<\/td>\nDeformation or displacement<\/td>\nPrioritise structural assessment<\/td>\n<\/tr>\n
Micro-cracking around a drilled hole<\/td>\nStress concentration or fabrication damage<\/td>\nCheck the fixing and hole diameter<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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Trace a visible crack through every layer before repairing it. It may be confined to the stone, continue across a bridged joint, originate in the substrate, accompany screed shrinkage or reveal structural movement. Photographs, drawings, joint layouts, level measurements and dated monitoring help direct the diagnosis without making the damage worse. Select the image to enlarge it.<\/figcaption><\/figure>\n
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Active or stable crack<\/h2>\n

Activity cannot be determined from a single photograph. Suitable tell-tales, dated measurements and observation through seasons or heating cycles help establish whether the opening is changing. A simple plaster tell-tale is not always sufficient and must not obstruct a specialist investigation.<\/p>\n

Vertical elements, ceilings, fa\u00e7ades, cantilevered steps and load-bearing components require particular caution because a falling fragment can create an immediate hazard.<\/p>\n<\/section>\n

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Checks that will not make the condition worse<\/h2>\n
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Check<\/th>\nHow to proceed<\/th>\nHow the result informs the diagnosis<\/th>\n<\/tr>\n<\/thead>\n
Damage mapping<\/td>\nPedestal defects on drawings and scaled photographs<\/td>\nReveals alignment and repetition<\/td>\n<\/tr>\n
Opening and level difference<\/td>\nMeasure with a suitable tool without forcing the crack<\/td>\nDistinguishes fine fissuring from displacement<\/td>\n<\/tr>\n
Continuity<\/td>\nInspect joints, the underside, accessible substrate and adjacent elements<\/td>\nMay identify an origin in the construction<\/td>\n<\/tr>\n
Cautious tap testing<\/td>\nBy a professional, and only where there is no falling hazard<\/td>\nMay reveal associated debonding<\/td>\n<\/tr>\n
Monitoring over time<\/td>\nDated measurements under comparable conditions<\/td>\nConfirms whether the crack is stable or active<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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Step-by-step diagnosis<\/h2>\n
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Stage<\/th>\nQuestion to resolve<\/th>\nDecision<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nIs there a risk of falling material or failure?<\/td>\nMake the area safe and obtain a specialist diagnosis<\/td>\n<\/tr>\n
2<\/td>\nDoes the crack continue through several layers?<\/td>\nInvestigate substrate movement<\/td>\n<\/tr>\n
3<\/td>\nIs the defect changing?<\/td>\nDo not fill it before the cause is stable<\/td>\n<\/tr>\n
4<\/td>\nCan the stone be repaired without compromising its function?<\/td>\nSelect bonding, a stone indent, pinning or replacement<\/td>\n<\/tr>\n
5<\/td>\nIs the repair appearance acceptable?<\/td>\nApprove colour, texture and visibility on a test piece<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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Treat the confirmed cause<\/h2>\n
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Confirmed cause<\/th>\nTreatment principle<\/th>\nCondition for success<\/th>\n<\/tr>\n<\/thead>\n
Small stable chip<\/td>\nCompatible stone indent or repair mortar<\/td>\nSound substrate, secure key and approved colour<\/td>\n<\/tr>\n
Break in a non-load-bearing component<\/td>\nDesigned structural bonding with reinforcement where required<\/td>\nClean faces, suitable geometry and compatible adhesive<\/td>\n<\/tr>\n
Crack related to the substrate<\/td>\nAddress movement, the joint or the failed layer<\/td>\nCause stabilised before finishing<\/td>\n<\/tr>\n
Dangerous or severely weakened element<\/td>\nControlled removal and replacement<\/td>\nHandling and fixings redesigned<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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What not to do<\/h2>\n