APP

Atactic polypropylene, a modifier used in certain modified-bitumen roofing sheets. The abbreviation does not prescribe an installation method for every grade.

Also called: atactic polypropylene

Material family: Construction, roofing and geosynthetics

Where it matters

Construction Materials & Building Envelope

Testing and verification

Interpret within the exact material, grade and test context.

Related guides

• Roofing Membranes & Underlayment

Related products and materials

• Water-Resistive Barriers
• PET Spunbond Roofing Carriers
• Air and Vapor Control Membranes
• Polyiso Insulation Boards & Facers

Technical references

• GAF SBS modified-bitumen family (opens in a new tab)

General information for preliminary evaluation; not independently reviewed or certified. Confirm grades, standards and suitability with the manufacturer for your application. Interpret within the exact material, grade and test method.

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