LYCOS RETRIEVER 
Waterproofing: Membranes
built 276 days ago
Over the past two decades, the construction industry has seen the advent of technological advancements in waterproofing materials, moving from membrane sheet applications to integral waterproofing systems. Integral systems work within the matrix of a concrete structure, giving the concrete itself a waterproof quality. There are two main types of integral waterproofing systems: the hydrophilic and the hydrophobic systems. A hydrophilic system typically uses a crystallization technology that replaces the water in the concrete with insoluble crystals. Various brands available in the market claim similar properties, but not all can react with a wide range of cement hydration by-products, and ... require caution. Hydrophobic systems use fatty acids to block pores within the concrete, preventing water ingress.
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There are several different types of BELOW-GRADE waterproofing membranes. When installed during new construction or when trenching is an option during retrofitting operations, the following types of waterproof membranes may be utilized to provide "positive side" waterproofing. Typically, the waterproofing membrane is attached to the outside of the BELOW-GRADE surface, covered with a protection membrane and the trench is refilled (sub-surface drains - French drains, for instance - may or may not be necessary):
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HLM 5000® is a one-component, moisture-curing, bitumen-modified polyurethane elastomeric waterproofing membrane for exterior below-grade or between-slab applications. It is available in 4 grades for application by trowel, squeegee, roller and spray. USE FOR: Parking garages and concrete tanks • Plaza decks and malls • Fountains and pools • Balconies and planters • Bridges and highways • Below-grade slabs • Walls and culverts • Sea walls, dams and reservoirs, etc.
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DECK SUB-SURFACE waterproofing membranes can be applied in the same manner as deck surface membranes or by utilizing the ASPHALTIC, POLYMER MODIFIED BITUMEN and THERMOPLASTIC materials described below. In addition, BUILT-UP ROOFING (BUR) is often used as a deck sub-surface waterproofing membrane.
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