ASTM D6381/D6381M-15 (R2020) PDF Download

The ASTM D6381/D6381M-15 (R2020) standard defines a laboratory method to measure the uplift resistance of asphalt roofing shingles. Uplift resistance is a property of shingles that determines their ability to withstand wind forces. The tests described in the standard measure this resistance after the shingles have been sealed under specific conditions.

The standard outlines two procedures, Procedure A and Procedure B, to measure the uplift resistance. Procedure A involves using a clamping device to lift the edge of the shingle and measure the force required to break the seal. Procedure B utilizes a metal "T" section applied to the weather surface of the shingle to measure a perpendicular force to break the seal. The appropriate procedure to use depends on the specific product design, geometry, and rigidity, and it is the responsibility of the user to determine the suitable procedure.

The standard acknowledges that various factors influence the sealing characteristics of shingles in the field, such as temperature, time, contamination, roof slope, and misplaced fasteners. However, the objective of this test method is specifically to determine the mechanical uplift resistance under controlled conditions, without addressing all these influences.

Additionally, the standard highlights the relationship between the mechanical uplift resistance measured in this test method and the uplift forces derived from wind action, as specified in Test Method D7158/D7158M. It notes that both procedures may need to be employed, and their results used in calculations, to determine the resistance of a specific product to wind effects.

It is important to note that this test method only applies to shingles that use a factory-applied or field-applied sealant. Shingles that rely on other means, such as geometry and construction, to resist wind forces are beyond the scope of this standard.