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For a safe ceiling
Living with an ugly wet patch on the ceiling is a problem that will rob most families of their peace of mind. Especially if the patch keeps expanding. In most cases, the water accumulating in the bathroom on the upper floor or the rain-washed terrace is likely to be the source of the leak. If only the builders had taken the trouble to use water-proofing compounds during construction.
Broadly categorised as construction chemicals, joint sealants and waterproofing compounds are flexible jointing materials that act as a seal or fill a gap between two elements to accommodate future movement due to expansion. They have gained widespread acceptance among builders for use on concrete, masonry surfaces. Several types of sealants and water-proofing compounds are available in the market today.
While polysulphide sealants are recommended for structural expansion joints in most civil engineering structures, such as building superstructure, subways, basements, floors and reservoirs, fuel-resistant pitch polyurethane sealants are used to seal joints on concrete roads, runways, oil terminals, parking bays and cargo areas where fuel and oil spillage are common.
Flexible
Heavy-duty epoxy urethane joint sealants are used to seal floor joints subject to heavy industrial use in factories and warehouses. Interior and exterior plaster cracks on walls and ceilings can be plugged with flexible acrylic sealant. General-purpose building sealants are suitable for sealing joints in concrete, brickwork, block work, perimeter sealing around doors and windows and floor joints.
Bituminous waterproof coatings are widely used to protect external surfaces and underground structures such as cellars, water tanks, reservoirs, basements and roof structures. Liquid elastomeric waterproofing membranes are favoured by engineers for application on foundations, basements, tunnels, ground floors, car decks, roof terraces, balconies, bridges and water-retaining structures, such as sewage works and inverted roofs.
The acrylic-modified cementitious coating for concrete and masonry surfaces is a seamless, flexible waterproof coating suitable for use in water tanks, sunken slab in toilet floors, sumps, roofs and basements.
T. NANDAKUMAR
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