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DIG 329 Installing wall ties in existing construction
Techniques have been developed since the 1970s for the reinstatement of cavity walls by inserting new wall ties without recourse to demolition and reconstruction. This digest describes the range of techniques and the associated hardware that are available. It deals particularly with cavity walls that either have been damaged or have lost their connection between the leaves as a result of the corrosion of steel wall ties. The methods described are also applicable to a range of related situations where ties are to be inserted; for example, tying back new walls to cross walls, repairing subsidence damage, stabilising collar jointed* and faced walls, tying back cladding walls to frame structures and tying back walls that have been cut for openings or movement joints. *Collar jointed walls: two parallel single-leaf walls, with a space between not exceeding 25mm, filled solidly with mortar and so tied together as to result in common action under load.
Replaces - BRE Digest 257.
de Vekey, R. C.
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