Wall ties are used in buildings with cavity walls. They are used to join the internal and external leaves of a cavity wall together, allowing the two parts to act as a consistent unit. Hidden from view after construction, wall ties play a vital role in ensuring the stability of a building. When Cavity wall ties fail, this is either down to an issue with the construction and installation of the ties, such as being incorrectly spaced, incorrectly fixed or too short, or due to corrosion over time. The signs of cavity wall tie failure include cracked or bulging brickwork, rust stained walls, and visible structural problems.
Prior to 1978, wall ties were expected to last the lifetime of the building, but it has since been recognised that these wall ties can corrode after only 15-20 years. At JW Stone Cleaning and Pointing, we use the Code of Practice for the Installation of Remedial Wall-Ties & Lateral Restraint Tie, and will conduct an inspection that is in compliance with the requirements of BRE digest 401. We will assess the cavity wall ties by using a boroscope to visually inspect the ties. We will produce a follow up report that will conclude whether or not a cavity wall tie replacement is needed. This may involve the installation of new ties and the exposal of the old and ineffective ties.
At JW Stone Cleaning and Pointing, we use Thor Helical Remedial CD Wall Ties, which are the fastest fixing wall tie in the market. They are reliable in all types of masonry, unobtrusive to the overall structure. They are robust and corrosion free, not relying on adhesion and unaffected by extreme temperatures, including fire. The deep continuous helical troughs prevent migration of water across the cavity, which means it can be used in conjunction with cavity wall insulation without the worry of spreading damp, and loads are spread evenly across the full penetrative length of the tie. We will offer a 30 year guarantee in association with StoneDry Damp-proofing.