Heely-Brown Company - built-up roofing

Built-up roofs are the traditional approach to flat commercial or industrial roofing in North America. Multiple layers of felt with interply moppings of asphalt or coal tar are assembled in the field to "build up" a finished roof assembly. These type of roofs are classed by the number of plies of felt that is used in their construction. Ex. "Three ply roof" or a "four ply roof".
Coal tar built up roofs are best used when roof areas have a very low slope and ponding water is probable. Coal tar is completely impervious to ponding water, one of the few roofing materials that has that attribute. Coal tar also has a low melting point, which means in the summer months, the coal tar becomes fluid and will "self-heal".
Asphalt built up roofs are best used when roof areas have significant slope where the low melting point of coal tar might cause "slippage" of the membrane. Normally any roof system which has in excess of 1/4" per running foot of slope should utilize asphalt if the building owner wishes to utilize a built-up system.
These type roof assemblies have a good life expectancy, normally in the range of 15 to 25 years. To get a good life span out of these systems, a protective surface must be applied to the top of the roof. The typical surfaces to protect the roof from solar radiation are embedding gravel in the asphalt/coal tar, applying a surface coating, or applying a granular-surfaced "cap" sheet.

Base & Ply Sheet Products
Certainteed
All Weather/Empire™ Base Sheet	A heavyweight, organic base sheet which is saturated and coated with asphalt and finished with a light mineral surfacing. Coverage: 200 sq./ft. per roll
Channel Vent™ Base Sheet	An asphalt coated fiber glass base sheet for systems where additional venting is desirable. Coverage: 100 sq./ft. per roll
GlasBase™ Base Sheet	A fiber glass base sheet, produced on a wet process fiber glass mat, coated with a weathering grade asphalt. Coverage: 300 sq./ft. per roll
FlintGlas® Ply Sheet Type IV	Manufactured on a durable high-quality fiber glass mat to provide moisture resistance and exceptional strength. Coverage: 500 sq./ft. per roll
FlintGlas® Premium Ply Sheet Type VI	Manufactured on a durable high-quality fiber glass mat to provide moisture resistance and exceptional strength. Coverage: 500 sq./ft. per roll
Yosemite® Buffer Base Sheet	A heavyweight, mineral granule surfaced roll good produced on a durable organic mat which is saturated and coated with asphalt and surfaced with mineral granules. Coverage: 100 sq./ft. per roll
GAF
GAFGLAS® #75 Base Sheet	A premium roofing base sheet constructed with a strong glass mat that is coated on both sides to assure a closed-sheet design to prevent asphalt bleed-through. Coverage: 300 sq./ft. per roll
GAFGLAS® FlexPly 6 Ply Sheet	A premium-performing fiberglass Type VI roofing felt. The proprietary Micro-Weave™ core provides superior tensile strength and dimensional stability, for greater resistance to splitting and cracking. Coverage: 500 sq./ft. per roll
GAFGLAS® Ply 4 Ply Sheet	Roofing felt that is designed for use in all climatic zones and is appropriate for use as a base sheet, as a ply sheet, and in the construction of flashing membranes. Coverage: 500 sq./ft. per roll
GAFGLAS® Stratavent® Eliminator Venting Base Sheet	A fiberglass-reinforced and granule-backed vented base sheet that allows controlled venting for water vapor to help prevent blisters and leaks. Coverage: 125 sq./ft. per roll
Johns Manville
GlasBase™ Plus Base Sheet	SBS rubber modified, asphaltic base sheet that is designed to be used as a base ply in built-up roofing systems and as a base or intermediate ply in modified bitumen systems. Coverage: 300 sq./ft. per roll
GlasPly® IV Ply Sheet	A fiber glass mat ply felt that is intended for use as an integral part of any built-up or modified bitumen roofing system. Coverage: 500 sq./ft. per roll
GlasPly® Premier (VI) Ply Sheet	A fiber glass mat ply felt that is intended for use as an integral part of any built-up or modified bitumen roofing system. Coverage: 500 sq./ft. per roll
PermaPly® 28 Base Sheet	A lightweight, asphalt-coated, fiber glass base felt designed for use as the first or base ply in built-up and modified bitumen roof assemblies. Coverage: 300 sq./ft. per roll
Vensulation® Felt	A specially constructed, heavy-duty, asphalt-coated fiber glass venting base sheet for use in hot applied built-up and modified bitumen roofing systems. Coverage: 100 sq./ft. per roll
TAMKO
Base-N-Ply® Base/Ply Sheet	Consists of a TAMKO fiberglass mat coated on both sides with asphalt that has been lightly modified with SBS rubber. Can be used as either a base sheet or ply sheet. Coverage: 300 sq./ft. per roll
Glass-Base® Base Sheet	Use as a base sheet in select modified asphalt and fiberglass systems or as an alternative to Type 43 Coated Base Sheet. Coverage: 300 sq./ft. per roll
Organic Base Sheet	This sheet can be mechanically fastened or hot-asphalt applied and is designed for use as a base sheet for use over nailable decks or insulation prior to the SBS-modified cap sheet of BUR systems. Coverage: 200 sq./ft. per roll
Tam-Glass Premium® (VI) Ply Sheet	A high-performance fiberglass ply sheet constructed with a TAMKO heavyweight fiberglass mat coated with weathering-grade asphalt. Coverage: 500 sq./ft/ per roll
Tam-Ply IV® Ply Sheet	A high-performance fiberglass ply sheet constructed with a TAMKO fiberglass mat coated with weathering-grade asphalt. Coverage: 500 sq./ft. per roll
Vapor-Chan® Venting Base Sheet	A heavyweight, venting base sheet that is intended to relieve vapor pressure over lightweight insulating concrete or gypsum decks. It is also specified in modified roofing systems installed over existing roofing systems. Coverage: 100 sq./ft. per roll
Vers-A-Base® Base/Ply Sheet	Consists of a TAMKO fiberglass mat coated on both sides with SBS-rubber-modified asphalt. Can be used as an alternate for Organic Base Sheet or Glass-Base® and also serves as a good vapor retarder when set in hot asphalt or between layers of insulation. Coverage: 150 sq./ft. per roll