Cavity Wall Ties Repairs

Cavity Wall Tie Repair

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Cavity Wall Tie Repairs

Millions of homes and properties across the UK suffer from either wall tie corrosion or wall tie failure, and are in need of specialist remedial wall tie replacement. More often than not the problem is that during building there have been insufficient wall ties installed.

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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What causes wall ties to corrode?

  • Inadequate protection - prior to 1945 wall ties were not produced to any particular standard

  • Substandard galvanisation - the British Standard for weight of galvanising was reduced between 1964-1981

  • Chemical action - corrosive black ash mortar may have been used if the property was built after 1938

  • Geographical location of the property - Properties along the coast, areas susceptible to driving rain and salt laden atmospheres are more at risk.

What if i have insufficient wall ties?

Do you think that your property may be affected by insufficient wall ties? The first step is to book a survey with a trained professional to determine the extent of the problem. The position of existing wall ties is plotted using a metal detector and then an endoscope is used to examine their condition.

Bricks may have to be removed for the physical examination of sample ties.

The installation of replacement wall ties:

A range of alternative wall tie designs are available: resin, drive tie or cementitious. This depends on the type and condition of the masonry involved. In most cases the existing ties are isolated to prevent further corrosion.

Formed in austenitic stainless steel, replacement ties are available in differing lengths to suit cavity widths up to 110mm. All designs incorporate a drip detail to prevent transmission of water across the cavity.