Steep-slope roofing includes water shedding types of roof coverings installed on slopes exceeding a 3:12 pitch (14 degrees). There are six generic classifications of steep slope roof coverings.
- Asphalt Shingles
- Clay tile and concrete tile
- Metal roof systems for steep-slope applications
- Slate
- Wood shakes and wood shingles
- Synthetic
Steep-slope roof systems typically are composed of individual pieces or components installed in a single piece fashion. Steep-slope roof assemblies typically consist of three primary parts:
- Roof deck – a roof deck is the structural substrate and usually 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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