Control Joint Cracks in Concrete - adding control joints may be necessary to reduce further slab cracking if the joints were omitted in the original construction.Please see the individual slab crack repair articles listed below List of Slab Crack Repair Methods Articles See FROST HEAVE / EXPANSIVE SOIL CRACKS in SLABS for details. Frost heaves or expansive soil damage can cause substantial damage to basement, crawl space, or garage floor slabs in some conditions.See SETTLEMENT CRACKS in SLABS for details. Settlement cracks in a slab indicate inadequate site preparation, such as failure to compact fill on which a slab was poured.The photo at left shows a typical concrete slab shrinkage crack.Īlso see SHRINKAGE vs EXPANSION vs SETTLEMENT. Shrinkage cracks in a slab are unlikely to be of any structural concern but can be a source of water entry or radon entry in buildings and may formĪ tripping hazard.Understanding the differences among these concrete crack types is an important first step in diagnosing their cause and their significance to the structure. Types of Cracks in SlabsĮach type of basement slab, floor slab, or slab on grade crack is discussed and described in articles at this website. In contrast, a concrete slab may have settled over poorly-compacted or washed-out fill (such as in some garages) without cracking (tipping instead), but repair may still be necessary to correct slope, provide drainage, or to prevent further settlement or even collapse. In fact some types of floor cracks, such as hairline concrete shrinkage cracks may not need repair at all.
Only by an accurate diagnosis of the cause of cracking or movement in a floor slab can we be assured that the crack repair will be durable and appropriate. FOUNDATION DAMAGE by MATERIAL or INCLUSIONSĪccurate Diagnosis of Slab Crack Cause, Impact on Structure, Repair Needsīefore attempting to choose a repair method for concrete floor slab cracks,ĭiagnose the cause of the slab movement and cracking.POLYURETHANE FOAM INJECTION CRACK REPAIRS.Built over thawing permafrost, the cause of these cracks needs to be understood before a proper repair can be designed.
Our photo (left) shows cracks developing in a slab on grade in a homein Alaska. Those likely to be important and potentially costly to repair. Types of foundation cracks, crack patterns, differences in the meaning of cracks in different foundation materials, site conditions, building history,Īnd other evidence of building movement and damage are described toĪssist in recognizing foundation defects and to help the inspector separate cosmetic or low-risk conditions from Repair Methods for Cracks in Concrete Slabs & Floors We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
#Patio slab crack repair how to#
This article series describes how to recognize and diagnose various types of foundation failure or damage, such asįoundation cracks, masonry foundation crack patterns, and moving, leaning, bulging, or bowing building foundation walls. This article describes methods for repair of cracks that occur in poured concrete slabs or floors and explains the need for accurate crack cause diagnosis and impact on structure before repairs are attempted.Ĭracks in concrete floors or slabs occur in poured concrete slabs may be found both in basement and in slab on grade or "patio home" construction and have a variety of causes and cures that we discuss here. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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