Cement based treatment for roofs and similar structures --- PERMAKAR 3 treatment
Cleaning the surface; preparing the surfaces by acid etching; treating the surface with a two-layer plaster; the first layer shall be 5 mm thick with cement (slag), admixed with an octadecanoic acid based cementitious waterproofing compound (bulk density not greater than 0.5 gm/cc, moisture content not greater than 2.0% and free fatty acid not greater than 0.2%), e.g., PERMAKAR 3, in the weight ratio of 50:3 for cement and waterproofing compound; finally providing a 12 mm thick cement-sand (1:4) plaster, enriched with polyester fibre, and curing the plastered surface; the treatment shall be impermeable under a waterhead of 20.0 metres.
Sealing of cracks in concrete roofs
Making a V-shaped groove 8-10 mm wide and 3-5 mm deep; filling the groove with acrylic-styrene based copolymer waterproofing compound, e.g., PERMANAR-D in water by repeated application of the waterproofing compound; spreading dry coarse sand when the last application of the sealing compound will still be wet; removing the excess sand on the following day and letting the treatment dry up for at least a day before any surface treatment on the roof.
Drain mouth on roof
Cleaning the surface of the structure at the final location of the drain mouth; lowering the drain mouth to the level of the concrete roof; chipping; thorough cleaning; mixing thoroughly an octadecanoic acid based cementitious waterproofing compound (bulk density not greater than 0.5 gm/cc, moisture content less than 2.0% and a free fatty acid less than 0.2%), e.g., PERMAKAR 3, in the weight ratio of 50 cement (slag) and 3 waterproofing compound; placing the drain mouth in its final position, followed by filling of the annular space around the drain pipe with a paste of waterproofing compound-cement; sealing the edges of the drain mouth with acrylic-styrene based copolymer waterproofing compound, e.g., PERMANAR-D.
Treatment of expansion joints
Cleaning the joint and surfaces abutting the expansion joint, applying two coats of primer on the cleaned surfaces at the opening of the joint, filling the joint (to a depth equaling half the width) with the paste of a two-component (with base-curing agent weight ratio of 12.33:1 and a sp. gr. of 1.60Ã‚±0.10 gms/cc and a minimum elongation of 250% on curing for 24 hours) polysulphide based sealant, e.g., PERMASULPH; permitting the sealant to cure in natural air for at least a day, providing the edges of the treatment with two coats of a paste of cement, octadecanoic acid based cementitious waterproofing compound, e.g., PERMAKAR 3 and acrylic-styrene based copolymer, e.g., PERMANAR-D.