Best Practices for Low Slope Roofs, Steep Roofs and Waterproofing

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Best Practices for Low Slope Roofs, Steep Roofs and Waterproofing

Low-Slope Roof Systems

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.

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.

Other Flexible Membrane Roof Systems

Introduction
Definition and Terms
RoofStar Guarantee Standards for Other Flexible Membrane Roof Systems
Accepted Materials
Application
Guide Specification
Construction Details

Steep-Slope Roof Systems

Steep Slope Roofs are water-shedding types of roof coverings installed on slopes greater 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.

A Steep Slope Roof typically employs individual components that, when installed together in shingled fashion, shed water.

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 Steep Slope Roof Systems therefore include the following system types in this section:

  • Architectural Sheet Metal (ASM) Systems
  • Asphalt Shingle Systems
  • Cedar Shake & Shingle Systems
  • Tile & Slate Systems


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


Waterproofing Systems

The Roofing Practices Manual defines "Waterproofing" as the treatment of surfaces or structures in order to prevent the passage of water under hydrostatic pressure. Typically, then, these surfaces are horizontal but are not a roof per se (though they may serve as a roof to, say, a parking garage, their primary function is a surface intended for human access). By contrast, roofing systems waterproof a roof surface or repel water from intrusion into a building not caused by hydrostatic pressure; roofs also provide limited access to human traffic, though there are exceptions.

See Low Slope Roofs or Steep Slope Roofs for other RoofStar Guarantee Standards, or return to the Home Page.

Introduction
Definition and Terms
RoofStar Guarantee Standards for Waterproofing Plazas, Promenades & Terraces
Accepted Materials
Special Applications
Guide Specification
Waterproofing Construction Details


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