ASTM D3909/D3909M-14 (R2021) PDF Download

The ASTM D3909/D3909M-14 (R2021) standard specifies the requirements for asphalt roll roofing (glass felt) that is surfaced with mineral granules. This type of roofing is commonly used as a cap sheet in the construction of built-up roofs.

The glass felt used in this roofing material is a thin porous sheet made primarily of fine glass fibers arranged in a nonwoven pattern. It is impregnated and coated with asphalt and is reinforced with random or parallel oriented glass yarns, which can be gathered, twisted, bonded, or unbonded. The presence of a water-insoluble agent ensures its durability and performance.

The standard sets out specific physical property requirements that the product must meet, including pliability, mass loss, behavior on heating, moisture resistance, and dimensions such as width, mass, and area. These requirements are important to ensure that the roofing material provides adequate protection against weather elements and maintains its integrity over time.