MIL-HDBK-1001/5A
7.4 Application Considerations. Consider the following application items:
a) Polyurethane foam resins field-sprayed to uniform thickness (1 inch (25 millimeters) minimum thickness, 2-1/4 inches (57 millimeters) maximum thickness) (two to three inches (51 to 76 millimeters) in semi-tropical environments) for best control of foam cell size, density, and overall uniform foam quality.
b) Membrane coatings applied to sprayed polyurethane foam substrates should always be fluid-applied. Fluid application works best with sprayed polyurethane foam because it fills the irregular substrate and adapts better to the slightly irregular surface of sprayed foam, to the "day's-work" termination details, and to the flashing of sprayed foam substrate. Foam applied today must be coated today. Coating should be applied in two or more coats with total minimum thickness as follows: 30 mils (0.76 millimeter) for silicone, 40 mils (one millimeter) for urethane or acrylic. In hot climates increase urethane to 45 mils (1.1 millimeter) and do not use acrylics.
7.5 Flashings. Fluid-applied flashings are generally self- sealing extensions of the membrane coating, applied simultaneously. Always specify cants.
7.6 Applicable Details. Polyurethane Foam Contractors' Division of the Society of Plastics Industry and Manufacturers' publications.
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