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  • 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
  • 4.  
  • 5.  
  • 6.                                                           TERMS OF USE & PRIVACY POLICY COPYRIGHT 2005 AFFILIATIONS ARCHITECTS PROJECTS COLORS WARRANTIES RETROFIT ACCESSORIES METAL PRODUCT LINE CONTACT US NEWS & EVENTS ABOUT US Fasteners & Accessories Tools Clips Underlayments Pre Manufactured Curbs ReRoof America Roof Hugger Cost Comparison
  • 7.