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Crack repair products strengthen cracked walls by enhancing the tensile, flexural and shear strength of masonry using various brick reinforcement techniques. Cracks in walls are usually caused by structural movement attributable to temperature variations, chemical reactions, age deterioration or changes in the moisture content of brickwork, or in the ground that supports it. Once a wall has fractured it is no longer a composite structural unit.
Typical defects that may trigger cracks in walls include any one or a combination of:
Before fractured walls can be repaired the cause of the fracture needs to be established and eliminated. Generally repair strategies fall into one of two categories:
Sub-structure repairs may include underpinning or piling.
Superstructure reinforcement generally includes structural repairs accomplished by the insertion of helical bars that form retrofitted brick beams or are used for crack stitching. Replacement wall ties and restraints tie cavity walls or separating façade walls whilst resin injection systems efficiently fill and seal cracks in walls
Once the cause of the fracturing has been eliminated then all that is required is to reinforce the cracked masonry so that it once again acts as a composite structural unit. Crack repair techniques include mechanical brick stitching and crack injection resins, whilst various tie and restraint systems help to transmit and share loads.