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<br />66 <br /> <br />Points of concern when installing a membrane will be briefly listed here, <br /> <br />1. Turns. Turns at vertical or horizontal corners should be made with fillets of at least two (2) <br />inches dimension on any side, <br /> <br />2, Seams. Membrane seams should be overlapped at least two (2) inches and thoroughly <br />interleaved and protected, <br /> <br />3, Pipes. Points where pipes or ducts penetrate a membrane must be made watertight. <br /> <br />4, Joints, Membranes should be continuous across construction joints, which should have <br />waterstops of rubber, copper or plastic (Figure 7.12). <br /> <br />5, Protection from Perforation. To protect membranes during backfill operations. at least one, <br />half inch of cement parging. plastic sheets or similar material should be provided, <br /> <br />3 6, Elevation. Membranes should extend at least one (1) foot above the BFE and be <br />attached or covered at its upper term ination, <br /> <br />Membrane waterproofing is shown in Figure 7,13. <br /> <br /> <br />"~: :.,:~;~;~: <br /> <br /> <br />:~';..'.::~:"~<> .:~ <br /> <br />(a) <br /> <br />(b) <br /> <br />NON- RIGID PERIMETER WALL AND FLOOR SLAB CONNECTIONS <br /> <br />Figure 7,12. Membrane and waterstop at joints, (Reference 40) <br />