Waterproofing Materials

(See Sections 5 and 6 for more detailed information)

1 General

A combination of technological and economic factors has brought about the increased popularity of flexible membrane roofing systems. As building and construction technology become more sophisticated, the demands on the roofing membrane become more severe. Large, highly insulated roof areas impose greater stresses on the membrane. Formerly expensive synthetic materials have become more cost competitive as the cost of petroleum products has increased.

2 Bituminous and Modified Bituminous

NOTE: See also SBS Membrane products and an Introduction to SBS Membranes

Bituminous and modified bituminous membrane systems have the benefit of offering the physical properties of a flexible membrane while retaining the practical advantages of bituminous materials. Roofers tend to have a certain “familiarity” with the product and they can be used in conjunction with some traditional products and methods. This may prove especially advantageous in re-roofing over surfaces contaminated with bitumen.

3 Thermoset (Elastomeric)

(See more at EPDM (Thermoset Membranes))

Thermoset flexible membrane systems are synthetic materials in which polymers chemically and irreversibly cross-link. This process is known as “curing” or “vulcanizing”. They may be manufactured in cured or uncured form. Once cured, the material cannot be bonded to itself except by using an adhesive and / or seaming tape. (See Manufacturer application standards)

4 Thermoplastic (Plastomeric)

See more at TPO, PVC (Thermoplastic Membranes)

Thermoplastic flexible membrane systems are synthetic materials in which cross-linking of the polymers does not occur. The membrane can be welded together by the use of solvents or heat. This process is repetitive and new welds may be formed at a later time. The strength of these welds often surpasses that of the base membrane.

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Steep-slope Membranes