Please note: All interim revisions for this edition available at time of your purchase will be included.

Materials for Built-Up Roof Coverings

UL 55A

Scope

These requirements cover the following materials for use in the construction of built-up roof coverings:

1. Hot-Mopping Asphalt - For use in the construction of coverings having either no surfacing or utilizing surfacings of cold-application roof coating on inclines not exceeding 12 inches (305 mm) to the horizontal foot, and for use in the construction of coverings surfaced with gravel, crushed stone, or crushed slag, on inclines not exceeding 3 inches (76 mm) to the horizontal foot.

2. Asphalt-Saturated Organic Felt- Type 15 (plain or perforated) and Types 20 and 30 (plain), including cap and base sheets.

3. Coal-Tar Pitch - For use in the construction of coverings surfaced with gravel, crushed stone, or crushed slag, on inclines not exceeding 3 inches (76 mm) to the horizontal foot.

4. Coal-Tar Saturated Organic Felt- Type 15.

5. Asphalt-Saturated Asbestos Felt- Type 15 (plain or perforated) and Type 30 (plain), including cap and base sheets.

6. Asphalt-Coated Glass-Fiber Mat (Felt) - Type G1 (ply sheets), Type G2 (cap and base sheets), and Type G3 (granular-surfaced cap sheets).

A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard. revised July 31, 2001