We have just completed a large contract to undertake a full measured defect survey to BRE Digest 251, a full Wall Tie Population Survey, a full Wall Tie Condition Survey and a full Wall Tie Corrosion Assessment using an intrusive removal of masonry to carry out the works.
The works were carried out to 5 High Rise Residential blocks using Rope Access as a means of access. In total 120 locations were surveyed over a 7-week period, with removal and replacement of masonry elements. Some masonry elements were sent away for compressive testing analysis.
What is the purpose of a wall tie?
Wall ties, sometimes called ‘brick ties’, are used in buildings with cavity walls. They are used to join the two leaves of a cavity wall together, allowing the two parts to act as a homogeneous unit. Hidden from view after construction, wall ties play a vital role in ensuring the stability of a building.
What is a wall tie survey?
Cavity wall ties are used in order to tie the two wall skins together when cavity wall construction is utilised. Cavity Wall & Tie Surveys check the integrity of your cavity wall ties.
How many wall ties are needed per m2?
Two and a half wall ties per square metre of masonry. The maximum horizontal spacing is 900mm and the maximum vertical spacing is 450mm.
How do you spot a Problem with Wall Ties?
Common wall tie failure indicators include:
- Horizontal cracking
- Out of plumb, bowed, cracked or collapsed brickwork elevations.
- Rust staining on the walls
- Problems having been identified within properties of a similar age and location.