There are six generic classifications of steep-slope roof  coverings. Click on a roof covering type for more information.

  • 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 are typically composed of  individual pieces or components installed in shingle fashion. Steep-slope roof  assemblies often consist of three primary parts:

  • Roof deck — A 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, providing a secondary  weatherproofing barrier. Sometimes underlayment is referred to as  “felt” or “paper.”
  • Roof covering — The roof covering is the  external water-shedding material.