Wall Tie Replacement
Wall Tie Replacement

WHAT IS STRUCTURAL WALL TIE REPLACEMENT?

Cavity wall ties are an essential part of any building. Their job is to tie together the visible protective outer cavity of brickwork or blockwork of a building to it’s structural and load bearing inner masonry skin.

Why do cavity wall ties start to fail? In most cases this will simply be age. Over time the mortar bed between bricks or blocks that each wall tie is set into changes on a chemical level due to carbonation. Through this the mortar itself begins to attack the wall ties and cause a build-up of iron oxide (or rust as it’s more commonly known). As each tie oxidises, layers of rust are formed and expand outwards, pushing apart the mortar beds and causing visible cracks.

WHAT TO LOOK OUT FOR?

  • Horizontal cracking – at regular intervals in external mortar joints
  • Outward bulging of the wall – joints widen causing the wall to deflect outwards, often around window frames
  • The lifting of roof edges – At gables the growth of brickwork can cause a noticable ‘pagoda’ effect
  • Internal cracks – vertical cracks may be found at internal wall junctions & horizontal cracks appear at internal wall and ceiling joints
  • Cracks to render coats
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