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Cavity Wall Tie Treatments

These are metal ties, which connect at regular intervals the outer and inner leaves of a cavity wall.


Early types are of thick ungalvanised metal, often in fishtail pattern shape.


These can rust and expand in the outer leaf of a masonry wall. This will cause the masonry to bulge out and eventually and become detached from the rest of the wall.


High winds can then cause considerable damage to walls, especially in exposed conditions in buildings over two storeys high. This is accentuated in coastal areas where high salt content of air accelerates corrosion.


The remedy is to locate the existing ties in the mortar joints with a metal detector, expose the end and isolate it with quick-setting plastic foam then repoint the joint.


New ties are then installed to the manufacturer’s specifications (usually around 2.5 per square metre and increased around window and door openings). They are usually installed through the centre of the brick then coloured mortar is used to disguise the entry hole.

Approved Specialist Contractor

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