Roof notes
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Roof notes

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    Roof notes Roof notes Presentation Transcript

      • 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)
      • 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
          • 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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