Roofing Base Sheet Definition

As the heated cap sheet is pressed onto the base sheet underneath the two will fuse and form a watertight seal.

Roofing base sheet definition.

Closure strip this material is used to close the openings that are created by joining metal panels or sheets and flashing. Gafglas 75 base sheet for built up roofing bur is a premium roofing sheet with a strong fiberglass mat to prevent asphalt bleed through. Base sheet an asphalt impregnated or coated felt used as the first ply in some built up and modified bitumen roof systems. The primary ply of roofing material in a roof system.

As this sheet of material is rolled out on top of the base sheet the roofer will heat the underside of the cap sheet material with a torch. The lowermost ply of roofing in a roof membrane or roof system. It is made of fiberglass or reinforced polyester or composite reinforcement and is saturated coated with modified bitumen asphalt. Black fasteners grey plates deck type.

The base sheet attachment pattern is used for the p1 field of the roof and is specific to each roof assembly and is listed in the md noa for the low slope ur. Chapter 15 of the hvhz portion of the florida building code requires that the base sheet be attached to the roof deck with corrosion resistant 1 1 4 ring shank nails and tin caps. An impregnated saturated or coated felt placed as the first ply in some multi ply built up and modified bitumen roof membranes. A roofing base sheet is the bottom waterproofing layer on a multilayer roofing membrane system.

Base sheets are surfaced with heat weldable film sand or a. The smooth cap sheet. This is asphalt enhanced with plastic or rubber polymer. Lightweight insulating concrete roof decks with minimum thickness of 1 25 3 18 cm and 1 25 3 18 cm for gypsum decks.

Certainteed glasbase base sheet is designed for use as a base sheet for both hot and cold applied inorganic built up roofing systems.