Low Slope Roofing Contractor


Roof systems and materials generally are divided into generic classifications: low slope and steep slope. Low slope roofing includes water impermeable, or weatherproof, types of roof membranes installed on slopes less than or equal to 3:12 (14 degrees). Steep slope roofing includes water shedding types of roof coverings installed on slopes exceeding 3:12 (14 degrees).

Low-slope roofing

There are several classifications of low slope roof membranes or systems.

  • Built-up roof (BUR) membranes
  • Metal panel roof systems for low-slope applications
  • Polymer-modified bitumen sheet membranes
  • Single-ply membranes
  • Thermoplastic membranes (e.g., PVC, TPO)
  • Thermoset membranes (e.g., EPDM)
  • Spray polyurethane foam-based (SPF) roof systems
  • Most low-slope roof membranes have three principal components:

    Weatherproofing layer or layers
    The weatherproofing component is the most important element because it keeps water from entering a roof assembly.
    Reinforcement
    Reinforcement adds strength, puncture resistance, and dimensional stability to a membrane.
    Surfacing
    Surfacing is the component that protects the weatherproofing and reinforcement from sunlight and weather. Some surfacings provide other benefits such as increased fire resistance, improved traffic and hail resistance, and increased solar reflectivity.

    Steep slope roofing

    There are six generic classifications of steep slope roof coverings.

  • Asphalt shingles
  • Clay tile and concrete tile
  • Polymer-modified bitumen sheet membranes
  • Slate
  • Wood shakes and wood shingles
  • Synthetic
  • Steep-slope roof assemblies typically consist of three primary parts:

    Roof deck
    The roof deck is the structural substrate and usually is a wood-based material such as plywood or oriented strand board (OSB).
    Underlayment
    Underlayment provides temporary protection until a roof covering is installed and provides a secondary weatherproofing barrier. Sometimes underlayment is referred to as "felt" or "paper."
    Roof covering
    The roof covering is the external water shedding material.
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