Cavity wall ties selection table

Table 4C.5 Cavity wall ties | Normal cavity width(1) (mm) | Permissable types of tie | Tile length(2) (mm) | Tie shapes in accordance with BS EN 845-1 | Tie number in accordance with DD140-2 | 50 to 75 | 200 | Wire type or thick plate type | Typed 1, 2, 3 or 4 selected on the basis of the design loading and design cavity width | Prescriptive rules for selection, and a model calculation are given in DD140-2 | 76 to 90 | 225 | Wire type or thick plate type | | | 91 to 100 | 225 | Wire type or thick plate type | | | 101 to 125 | 250 | Thick plate type | | | 126 to 150 | 275 | Thick plate type | | | 151 to 175 | 300 | Thick plate type | | | 176 to 300 | see Note (2) | Thick plate type | | | Notes: (1) Where face insulated blocks are used the cavity width should be measured from the face of the masonry unit (2) The embedded depth of the tie should be not less than 50 mm in both leaves. For cavities wider than 180 mm calculate the length as the structural width plus 125 mm and select the nearest stock length