CAVITY WALL TIE INSTALLATION


Wall tie corrosion was first recognised in South Wales in the 1960s. corroded or a lack of ties in a cavity wall considerably reduces the strength and stability of the wall, in particular resistance to wind loads is impaired and failure from this cause is possible. While sudden failure is unlikely to occur it would be prudent to rectify the matter once noted as the defect is liable to affect the value and resale prospects of the house.

Stepped cracking and bulged brickwork can be the result of wall tie corrosion

Corrosion of the wall ties result in expansion of the metal embedded in the outer leaf, eventually to a size several times its original thickness, sometimes splitting the bed joints and causing either lifting or bowing of the walls and damage to internal finishes. Instability of the walls can result if the ties waste away and break completely, resulting in the need to rebuild the wall.

                                                         



If symptoms are recognised before damage has progressed too far the walls may be treated rather than rebuilt. This consists of the location of the old ties by an electronic detector, replacement in a suitable corrosion resistant remedial fixing. Corrosion of the tie within the inner leaf is unlikely to become significant.

Robinson's surveyors can inspect the wall ties with the aid of an endoscope to provide a full written report with specifications and costs for remedial works.

Robinsons have a range of repair systems available and will recommend the most suitable to your property. The remedial tie illustrated is the mechanical wall tie.

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This site was last updated 26-06-2006