Cavity Wall Tie Replacment

Remedial replacement cavity wall ties can stabilise the structure, these type of replacement cavity wall ties are produced in a range of different products.

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Cavity Wall Tie Replacement and Repair

Two leaves of brick or stonework are held together using metal straps or “wall ties”. The cavities between the two leaves of masonry provide an affective barrier to water penetration and also acts as an insulation layer. This can be in brick or stone properties.

In some circumstances these wall ties are of mild steel and can corrode to the point of failure (see wall tie failure).

Failure can manifest itself as cracking in the external leaf of masonry, structural movement or in severe cases the collapse of sections of masonry.

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In stone properties with an in filled cavity the through stone can be insufficient to restrain the two leaves of stone. This can result in separation of the masonry and if there is a cavity infill making this wall a solid wall this infill can settle pushing the wall out of plumb.

Remedial replacement cavity wall ties can stabilise the structure, these type of replacement cavity wall ties are produced in a range of different products from resin fixing to CD drive in ties and mechanical fixed cavity wall ties.

A Selection of Remedial Cavity Wall Ties

Below to the left are mechanical fix and to the right dry fix cavity wall ties

Cavity Wall Tie Failure in Brick Cavity Wall

All masonry walls that are built void or cavity between the leaves of masonry need to be stabilised with the use of cavity wall ties.

The cavity wall ties maintain the structural integrity of the wall preventing movement of the cavity wall construction.

In older properties the use of mild steel cavity wall ties used decades ago in the original construction can cause problems. Water penetration to the outer leaf can result in wall tie corrosion of the original cavity wall ties and leading to wall tie corrosion and eventually to structural failure of the cavity wall.

In new construction these cavity wall ties are usually made of stainless steel and are built in to the mortar joints as the wall is constructed.

Remedial cavity wall ties can be inserted in what is referred to as a retro fit system. They are installed through pre-drilled holes straight into each of the outer and inner leaves of the masonry cavity wall from one side. These replacement cavity wall ties are secured by screw action (dry fix) mechanical expansion (mechanical ties) or by the application of resin to bond the new tie to the masonry (resin bonded).