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A wall tie is a steel bar, strap or twisted wire which is built into a double skin or cavity wall to hold the masonry together; usually made of mild steel. Wall ties are crucial to the stability of external walls.
The principal of cavity wall construction is simple and effective. Separate outer and inner layers of brickwork are held rigidly together with steel bars or straps called metal wall ties.
Cavity Wall Tie Replacement
Problems arise when the metal wall ties corrode. Corroded wall ties can expand up to nine times their original thickness, causing the mortar joints within the wall to crack and be forced apart which in turn leads to horizontal and stepped cracking in the brickwork.
Cavity wall tie failure can also cause the brickwork to bulge and excessive cracking can weaken the walls and they become unstable.
How Can We Help?
We offer a wall tie replacement service and installations of new remedial stainless steel cavity wall ties in properties at a fraction of the cost of rebuilding.
As this is carried out from the outside of the building, it only takes a few days to complete and we aim to cause only minimum disturbance.
Our fully qualified surveyor holds the National Qualification for remedial surveying (C.S.R.T.) and undertakes inspections of properties, using an endoscope, to determine the condition of wall ties and the extent of any corrosion. We use top quality stainless steel remedial fixings.
Benefits To You
Archer Specialist Treatments have carried out wall tie replacement works to properties for domestic clients, councils, housing associations, English Heritage and many more.
The condition of the wall ties in a house can only be discovered by a visual inspection of the metal tie. This can only be done by using advanced optical boroscope instruments or by removal of brickwork or mortar from the external leaf of the wall. In cases of advanced corrosion visual signs such as cracking can occur, but this is not always the case.
Images 1 and 2 = Following the inspection of cavity wall ties to the King Alfred Sports Centre in Hove, it was apparent that cavity wall tie corrosion meant the replacement of the original corroded ties but the extent was so bad that along the east-elevation at high level the whole flank had to be rebuilt for safety reasons.
Image 3 = This shows wall tie that has snapped due to corrosion.