Cracks in brickwork can be unsettling, not just for how they look, but for what they might be hiding beneath the surface. Stepped or diagonal cracking can have several causes. Its appearance alone does not establish whether cavity wall ties are defective. An inspection should assess the cracking, wall construction and any evidence of ongoing movement before repairs are recommended.
At CavClear, we specialise in a proven method of repair called brickwork stitching. Where the inspection findings support its use, crack stitching can reinforce localised areas of masonry and may avoid rebuilding. Its suitability depends on the cause and extent of the damage.
What Causes Step Cracking?
Step cracking typically follows the mortar lines in a zig-zag pattern and is often seen near windows, doors, or corners of buildings. Possible causes include building movement, temperature or moisture changes, defects around openings and problems affecting masonry support. Cavity wall ties connect the inner and outer wall leaves; their condition is one consideration, but stepped cracking should not automatically be attributed to failed ties.
Older steel ties may corrode. Corrosion can cause expansion and damage to surrounding mortar or masonry; advanced deterioration or inadequate ties may reduce restraint to the outer leaf. Early corrosion does not automatically mean a tie has failed or requires replacement. Tie type, condition, distribution and effectiveness should be assessed.
You can read more about this, here.
The Role of Brickwork Stitching
Brickwork stitching reinforces suitable areas of cracked masonry using stainless steel helical bars bonded into prepared mortar joints. The repair specification should suit the wall construction, the findings and the selected repair system.
The process involves preparing specified mortar joints across the crack, installing helical bars and bonding them with a compatible repair grout. This helps transfer loads through surrounding masonry. Stitching does not by itself resolve every cause of cracking or guarantee that further movement will stop; the underlying cause must also be considered.
After installation, affected joints and cracks are made good. We aim to match the existing finish as closely as reasonably practical, although repairs may remain visible because of differences in materials, colour and weathering.
Why Stitching Matters in Wall Tie Repairs
Where a survey identifies defective ties and associated masonry cracking, wall tie replacement and localised crack stitching may both be recommended. Replacement ties connect the wall leaves, while stitching reinforces specified cracked areas. Not every cracked wall requires replacement ties, and not every wall tie replacement requires stitching. Ongoing or substantial movement may require further assessment by a suitably qualified specialist before a repair scheme is agreed.
When Should You Be Concerned?
Arrange an inspection if cracks are new, widening or recurring, or if there is bulging, leaning or loose masonry. Crack width alone does not establish the cause or seriousness. Rust staining may warrant investigation but does not confirm wall tie corrosion. Significant movement or an apparent risk of falling masonry requires prompt professional assessment.
At CavClear, we provide cavity wall tie surveys, wall tie replacement and brickwork crack stitching where appropriate. Our reports explain the findings, photographs, inspection limitations and practical recommendations.
Repair quotations confirm the proposed works, access requirements, making good and any guarantee terms applicable to the agreed scope. Repairs are recommended according to the property and inspection findings.
Get in touch today to book a site visit or find out more about how brickwork stitching could restore strength to your home or property.
Recent Comments