Gable wall strapping to roof

The gable wall should be strapped to the roof as shown in Diagram 4C.13(a) and (b) by tension straps as described in paragraph 4C.23. Vertical strapping at least 1 m long having a minimum cross-section of 30 mm x 5 mm should be provided at eaves level at intervals not exceeding 2 m (see Diagram 4C.13(c) and 4C.13(d)). Vertical strapping is not required if the roof – (a) has a pitch greater than 15°; (b) is clad in tiles or slates with a laid mass per unit area greater than 50 kg/m2; (c) is part of a building in a low wind exposure area; and (d) has main timber members spanning onto the supported wall at not more than 1.2 m centres.