Remedial Wall Ties
Wall ties are essential in cavity walls to ensure that the wall is structurally stable and sound. A cavity wall is as strong as a solid wall but only when the inner and outer leaf of brickwork is securely tied together by wall ties which are in good condition and fitted correctly. A lack of properly installed wall ties can lead to distortion, cracking or in extreme cases the collapse of the outer brick leaf.
Wall tie corrosion is a significant issue in older properties and again this can lead to cracking and distortion of masonry. It is essential that corroded wall ties are replaced by remedial cavity wall ties to ensure the cavity wall remains stable. New wall ties may be needed in existing walls to:
- stabilise the cavity wall where steel ties have expanded due to corrosion.
- reinstate cavity walls where the existing wire ties have corroded.
- increase the number of ties in a wall where insifficient ties have been installed, or where embedment is insufficient.
Thor Helical Remedial have a complete range of replacement cavity wall ties available to the wall tie installer. We distribute Thor Helical Wall Ties including the Airtwist CD Tie (see video below) which is CE marked and installed neatly and quickly giving an almost invisible repair to your masonry.
Thor Helical Remedial also have a complete range of neoprene wall ties in various lenths to suit wall tie installers and project requirements. Our complete range of cavity wall ties and repair details can be seen by following the links on the left.
All Thor Helical Remedial wall ties are manufactured from 304 or 316 stainless steel. Thor Helical remedial are wall ties suppliers and we offer a range of fixings to choose from to provide the right Wall Tie fixing for all situations.
Designing Remedial Works
Remedial Cavity Wall Tie Systems can be employed to reinstate stability to existing walls; damaged by expansion of corroding mild steel vertical twist ties; loss of wire ties by corrosion; insifficient wall ties; ineffective wall ties and or unrestrained masonry.
The choice and validation of a suitable remedial wall tie system and their density must provide for fixing in both inner and outer leafs required by the imposed loads (refer to topographic tables) and conform with BRE Digest 329, 401 and BS 5628.
Testing should be undertaken as a minimum on one or two fixings to each elevation to determine the minimum pull load obtainable from both leafs. On large projects 5% of ties should be tested as part of the installation routine. The tensile load results should be used to determine the suitability of the fixing and density in accordance with BRE Digest 401.
It is not practical to carry out compressive resistance tests on site. Thor Helical Remedial wall ties can be considered adequate in compression as compression required is usually 80% of that needed in tension when tested in accordance with DD140: part 1.
All Thor Helical remedial Wall Ties can be pull tested.
Wall Tie Video