All steep-slope roof systems (i.e., roofs with slopes of 25 percent or more) have five basic components:
- Roof covering: shingles, tile, slate or metal and underlayment that protect the sheathing from weather.
- Sheathing: boards or sheet material that are fastened to roof rafters to cover a house or building.
- Roof structure: rafters and trusses constructed to support the sheathing.
- Flashing: sheet metal or other material installed into a roof system’s various joints and valleys to prevent water seepage.
- Drainage: a roof system’s design features, such as shape, slope and layout that affect its ability to shed water.
Author: Charlie McCurry
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