• On large openings torque steel wires around opening. • Consider who is going to be responsible for DPM/waterproofing below ground to allow backfilling at earliest opportunity • DPC/Tray to be correctly fixed/jointed (check required lap) Bitumen DPC with torched joint is best. • Support must be provided to all DPC trays. • DPC / Tray to be laid on full bed as per specification. • Weep holes should be installed above trays according to specification. • Gauge inner and outer skins correctly, use gauge rods / datums. • For partial cavity fill, build inner leaf first, and leave out leaf below top of insulation (resistant clips). • For full cavity fill, build outer leaf first, and fully flush all joints on inner face before fixing insulation. Leave inner Leaf below top of insulation. • Ensure insulation is installed sufficiently below ground level to avoid condensation. • All cavities and edge of insulation to be kept clean. • Use battens or other system. It may be difficult but is critical. • Where possible, always screw fix ties to steelwork but shot firing may be acceptable. Obtain ‘gun’ supplier’s advice and carry out tests and training. • Ties must slope outwards and be level or sloping on the outside and be embedded a minimum of 50mm min. • Ensure ties are installed the right way up. • Check tie centres required for insulation. • Ensure correct type of tie at movement joints. • Ties at reveals / movement joint are at specified distances. • Ensure type of tie is suitable for height of masonry. • Check distance of ties required adjacent to stainless steel support angles. • If stainless steel supports angles are not continuous ensure there is a vertical movement joint where it stops. • HOLD POINT: check all support angles prior to loading. Avoiding Defects - Revision D – July 2013
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