This specification covers in-situ applied, single-pack, moisture-triggered, aliphatic polyurethanes intended to form an elastomeric single-ply roofing membrane, once cured. The cured membrane may or may not contain a reinforcing material. The product, as manufactured, shall be in liquid form for application by brush, roller, or spray equipment. In-place roof system design criteria such as fire resistance, material compatibility, and uplift resistance, among others, are beyond the scope of this specification. Wet coatings shall be tested and shall conform to liquid property requirements as to viscosity, volume and weight of solids, and sag resistance. Dry films shall also be tested and conform to physical property requirements, as follows: tensile strength; elongation; accelerated weathering; water vapor transmission permeability and permeance; mandrel bend flexibility; tear resistance; Taber abrasion resistance; indentation hardness; dynamic and static puncture resistance; and adhesion bond strength.

1.1 This specification covers in-situ applied, single-pack, moisture-triggered, aliphatic polyurethanes intended to form an elastomeric single-ply membrane, once cured. The cured membrane may or may not contain a reinforcing material.

1.2 Single-pack, moisture-triggered, aliphatic polyurethanes are characterized by their ability to use moisture to trigger the curing process only.

1.3 The tests and property limits used to characterize the liquid material and cured membrane are values intended to ensure minimum quality. In-place roof system design criteria such as fire resistance, material compatibility, and uplift resistance, among others, are factors that shall be considered but are beyond the scope of this specification.

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.