Vector Construction Inc

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A. There is no hard and fast number that is useful to the designer. Generally, an adhesion value is a compromise between the type and condition of concrete substrate, the stresses placed upon the membrane prior to project completion, and the requirements of the membrane to withstand in-place use stresses. Where possible, concrete should have all surface paste removed and be free of laitance of any kind. A texture similar to 80-grit sandpaper as a minimum is desirable. Since concrete has low tensile properties, especially at the surface faces of large plan areas, one rule of thumb is to expect adhesion to range around ten percent (10%) of ultimate compressive strength of the concrete. The best that can be expected is in the range of 350 psi to 450 psi for 4,000 psi concrete properly cured and of sufficient age to acquire its maximum physical properties. Q? SHOULD THERE BE CONCERN THAT POLYUREA CONTAINS ISOCYANATE? A. Polyurea products from VersaFlex are based on diphenylmethane diisocyanate (MDI) or 1,6 hexamethylene diisocyanate (HDI) polymer technology. These polymers have a low vapor pressure which corresponds to a low evaporation rate.

Spray polyurethane foam (SPF) roofing consists of an application of specifically designed foam covered with an elastomeric coating (typically acrylic, silicone or polyurethane) or aggregate covering to protect the foam from ultraviolet rays. Specialized equipment mixes two liquid components at the spray gun that applies the SPF to a prepared substrate. The mixed liquid expands many times its original volume in a matter of seconds, forming a rigid foam plastic that chemically bonds to the surface to which it is sprayed. Spraying the foam in ½" to 1½" lifts allows the applicator to reach the desired thickness to fill in low areas, build up slope, and provide insulation. SPF has a closed cell structure that makes it water resistant. It must, however, be protected by elastomeric coatings or other coverings (such as aggregate) to prevent ultra-violet-induced surface degradation. Such coverings can also be used for other purposes, including, inhibiting moisture vapor transmission, enhancing the aesthetics of the system, increasing the impact and abrasion resistance of the system, achieving non-flammability and meeting code requirements.

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