Low Slope Membrane Roofs

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Low Slope Membrane Roofs

Low Slope Membrane Roofs include weatherproof membrane types of roof systems installed on slopes at or less than 3:12 (1:4, or 14 degrees). In some instances, roof systems designed for low-slope applications may be used on roofs with a slope greater than 3:12. Conversely, some steep-slope roof materials may be used on roofs with slopes less than 3:12. Consult the RoofStar Guarantee Standards for Guarantee requirements, Guiding Principles and Recommendations in any application (click expand to read more).

Low Slope Membrane Roofs employ a weatherproof covering or membrane that keeps water from entering a building. These membranes may be comprised of one or more layers. They include Built-up Roofs (BUR), which utilize multiple layers of felt or modified bituminous membranes laminated or bonded together with hot bitumen and coated on top with small rock (these are commonly referred to as 'tar and gravel roofs').

A Roof System (different from a roof assembly) excludes the structural roof deck but includes the roof covering and any other components, including insulation.

The RoofStar Guarantee Standards for Low Slope Membrane Roof Systems include the following membrane types in this section:

  • SBS Roofing Systems
  • EPDM (Thermoset Membrane) Systems
  • TPO/PVC (Thermoplastic Membranes) Systems
  • Built-Up Roofs (BUR)
  • Other Flexible Membrane Systems (APP, etc.)

See Steep Slope Roofs or Waterproofing Plazas, Promenades and Terraces for other RoofStar Guarantee Standards, or return to the Home Page.

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