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Built Up Roofing (BUR) Membrane

Built Up Roofing (BUR) Membranes are typically found on flat or nearly flat roofed buildings. These Membranes are referred to as built-up due to a process of overlapping several layers of roofing felts with hot or cold adhesives. BUR felts can be made of organic, fiberglass or polyester composition. The hot adhesives will be one of three main types: asphalt, modified asphalt or coal tar pitch. The cold adhesives are either asphalt or coal tar pitch based. A layer of gravel is typically the final step which protects the roof from ultraviolet degradation and provides weather resistance.

Advantages of BUR Membranes

  • Long solid track record that dates back to early twentieth century
  • Can be cold or hot applied
  • High tensile strength reduces the possibility of roof splits
  • Excellent Fire Resistance
  • Excellent puncture and tear resistance
  • Multiple ply systems

Advantages of Coal Tar Pitch BUR Membranes

  • System can tolerate ponding water without risking damage to the membrane
  • Low melting point of the coal tar bitumen easily reseals small punctures giving coal tar pitch membranes a self-healing characteristic
  • System stays flexible for years after installation
  • Longest life system on the market

Advantages of Asphalt Based BUR Membranes

  • Low fuming characteristics of asphalt BUR is less objectionable to building occupants
  • High melting point of asphalt makes for a stable bitumen that will not run into the build or down the outside walls in hotter climates
  • Can be used on buildings with slopes over per foot without experiencing slippage of roofing felts

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