Cavity Wall Tie Replacement & Repair Service
Wall tie corrosion can lead to cracked external walls. ASRS provides a range of cavity wall inspections and repair solutions.
We have a range of solutions from HELIFIX for various applications and wall types, so contact us with your enquiry. 25-year insurance-backed guarantees are available with every wall tie installation.
What is the purpose of cavity wall ties?
Cavity wall design incorporating metal wall ties has been in use since the beginning of the nineteenth century. Their purpose is to prevent rain penetration and to improve thermal insulation. Over recent years, it has become apparent that a high number of properties built before 1981 are suffering from premature wall tie corrosion. Pull out testing can identify where the issue lies and will determine the solution required.
Latest research by the Building Research Establishment, has found that wall ties corrode faster in the mortar within the external leaf of brickwork, leading to oxidisation, where they will expand to several times their original size. This expansion will cause structural instability by lifting the mortar joints where they lay.
What happens when wall ties corrode?
Visual evidence of corrosion can be seen by horizontal and diagonal stepped cracking to external wall surfaces. If corrosion is severe it will lead to distortion and bulging. In some cases external walls have collapsed during gales. Research has also found that a high percentage of properties inspected had an inadequate number of wall ties especially around openings, i.e. windows and doors.
To find out more about our cavity wall tie replacement services, contact us or request a brochure.