Cavity Walls were introduced in the very late 18th and early 19th centuries to stop the penetration of moisture into the internal skin of masonry. When cavity wall construction began the inner and outer walls were tied together using randomly placed bricks or stones. This method was quickly phased out with the introduction of iron fishtail ties.
Cavity wall ties are prone to defect as moisture penetrates the outer skin of failed pointing and cracked masonry. The ties then corrode and oxidise causing horizontal cracking within the bed joint, severely weakening the structure and increasing the risk of collapse where the external facade moves away from the internal wall.
SIGNS OF DAMAGED WALL TIES AND WALL TIE CORROSION
- Vertical or horizontal cracks in brickwork
- Bulging Brickwork
- Cracks or separation of window reveals
- Lintels sagging
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.
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