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Cavity Wall Ties
What Is a Cavity Wall Tie?
A cavity wall tie is a corrosion-resistant metal connector that links the inner and outer leaves of a cavity wall. It ensures the two masonry skins act together structurally, while also helping to control moisture transfer across the cavity.
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Purpose and Function
​Cavity wall ties are installed during the construction of a cavity wall. Their purpose is to tie the inner leaf masonry to the outer leaf masonry via the cavity within the wall- working cavity wall ties are essential to ensure the wall remains stable and resistant to wind loads and wind suction. Wall tie failure or incorrect density of cavity wall ties leads to structural failure or collapse of the wall.
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A visibly rusted and failed wall tie from within a cavity
How to identify tie failure
Failed cavity ties can be identified by horizontal cracking of the exterior masonry or bulging of the outer leaf masonry. Corroded ties can be identified by physical inspection of the cavity - either by brick removal, or endoscopic camera investigation via a small pilot hole after ties have been found from the outer leaf by use of a metal detector.
Methods we use to identify
Walls are physically inspected for cracking or displacement of brickwork.
Tie density is then checked with the use of metal detectors
Tie condition is physically checked with endoscopic camera inspection via a small pilot hole- as seen in photos below.
Methods we use to repair
Firstly we carry out engineering calculations for wall tie requirements based on location, slope of land, vertical height of the building and thickness of the wall.
Once required pull out values of replacement ties are confirmed we test proposed replacement ties using a test tie and carrying out load test to proof capacity (using a specialised load tester, as seen in photos below) in accordance with B.R.E guidelines.
A full report is then issued to our client along with the results of the proof tests
Once testing has been completed, we carry out the full installation of ties as per the client's specification, repointing brickwork with coloured matched mortar so that our installation will be barely noticable.
Live Wall tie load testing in progress- results generated into a printable report and graph for the customer
Is this something we can do for you? Submit an enquiry, or get in touch on one of the following:
Tel: 01162375082
Mobile: 07908783783936