The slabs ranged from 400 mm to 2.4 m thickness by design but due to developments of cracks began to leak. Through our local distributors, six pails of Xypex Patch’n Plug were used to treat all joints and cracks with 30 pails of Xypex Concentrate brush applied over the 740 m² of roof slab to a rate of approximately 1.0 kg/m². All the cracks were sealed, leakages on the slab stopped and the bunkers waterproofed against water ingress.