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Wall Ties & Restraint Fixings

Tie Length & Density

Tie Length

Wall ties should be of the correct length to ensure they are properly embedded in the masonry. We recommend tie lengths which achieve an embedment of between 62.5mm and 75mm.

For typical layout of wall ties indicating maximum spacing, see the image below or click the link. Refer to PD 6697 : 2019 for complete information.

Typical layout of wall ties indicating maximum spacing

 

Recommended Lengths of Masonry/Masonry Wall Ties

Cavity Width (mm)Length of Wall Tie (mm)
50-75 200
76-100 225
101-125 250
126-150 275
151-175 300
176-200 325
201-225 350
226-250 375
251-275 400
276-300 425
301-325 450
326-350 475
351-375 500
376-400 525
401-425 550
426-450 575

Notes: For Two-Part Tie click here. The Ancon Staifix-Thor Helical TJ2 wall tie requires 85mm embedment in the inner leaf of blockwork and 70mm in the outer leaf of brickwork.

Density & Positioning of Ties

For walls in which both leaves are 90mm or thicker, ties should be used at not less than 2.5 per square metre (900mm horizontal x 450mm vertical centres). This spacing may be varied when required by the Building Regulations. Ties should be evenly distributed over the wall area, except around openings, and should preferably be staggered.

At vertical edges of an opening, unreturned or unbonded edges, and vertical expansion joints, additional ties should be used at a rate of one per 300mm height, located not more than 225mm from the edge.

Timber Frame Ties

Timber frame ties should be installed at a density of 4.4 ties per square metre in buildings where the basic wind speed does not exceed 25m/s (BS 6399-2: 1997 Code of Practice for Wind Loads). The density should be increased to 7 ties per square metre in more severe situations.

Remedial Wall Ties

No British Standard has yet been defined for the spacing of remedial wall ties. However, accepted practice is to follow PD 6697 that is 900mm horizontally and 450mm vertically in a staggered pattern with 300mm vertical centres around openings within 225mm of the opening.

CAD Drawings

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