The document discusses different types of roof membranes, including built-up roof (BUR) membranes made of multiple felts and asphalt layers, modified bitumen roof (MBR) membranes made of polymer-modified asphalt sheets, and single-ply roof (SPR) membranes made of synthetic polymer sheets. It also describes some common polymers used in modified bitumen membranes like SBS and APP and materials used in felts like organic fibers, glass fibers, and asphalt or coal tar coatings. Finally, it mentions two common types of single-ply membranes - EPDM, a synthetic rubber membrane, and PVC or TPO thermoplastic membranes.

1. Roof Membranes : Built-up roof membrane (BUR) 3 to 5 plies of felts with asphalt (bitumen) moppings between stone aggregate (3/8” and 400 lbs per sq) laid over a flood coat Modified bitumen roof membrane (MBR) 2 to 3 plies of modified bitumen sheets with moppings between Single – ply membrane (SPR) one sheet of synthetic polymer (plastic)

2. Bitumen – asphalt - waste product (residue) or distilled crude oil coal tar – residue of distilled coal (literally “stinks”) Roofing Asphalt – ASTM specs 4 types (Type I, II, III, IV) Type III: most common softening point temperature (SPT) 185 ° Type III 25 lbs. per square for interply & 60 lbs per square for flood coat Modified Bitumen Roof Membrane – polymers added Styrene butadiene styrene (SBS) synthetic rubber (with mopped asphalt) Attactic polypropylene (APP) greater UV resistance (open flame applied) Felts (woven sheets) organic – paper or wood fibers inorganic – glass fibers (fiberglass) asphalt-treated fiberglass felt (most common) coal tar-treated fiberglass felt

3. SPR Single – ply membranes Thermosetting polymer (unweldable plastic) does not soften with heat Must use adhesives and or tape EPDM (ethlene propylene diene monomer) a synthetic rubber most common Thermoplastic polymer (weldable) Softens and rehardens with heat Not as stretchable PVC (polyvinyl cloride) and TPO (thermoplastic polyolefin) most common

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