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A GUIDE TO THE INSTALLATION OF WALL TIES

This diagram shows the typical positioning and density of wall ties for standard situations. BS5628: Part 1 recommends that where both leaves of a wall are at least 90mm, wall tie density should be no less than 2.5 wall ties per square metre (900mm horizontal x 450mm vertical centres). Where the cavity width exceeds 75mm, building regulations require the horizontal spacing to be 750mm maximum, although this can vary if building regulations require. Ideally the wall ties should be staggered and evenly distributed over the wall area, except where openings do not allow this to happen. Extra wall ties at one per 300mm height should be used at the vertical edges of an opening, unreturned or unbonded edge and vertical expansion joints. In these cases, the wall ties should be less than 225mm from the edge. If insulation board is used in the cavity and restrained by wall ties using insulation retaining clips, the horizontal wall tie spacing may have to reduce to 600mm.

3.0 Recommended lengths of Wincro Wall Ties

British Standards require a 50mm minimum embedment of wall ties into mortar courses. To allow for site tolerances, Wincro recommends choosing wall ties to provide a 62.5mm embedment.

DD140 Wall Tie (mm)

Wall Tie length (mm)

Cavity width (mm)

200

225

250

275

300

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