--- title: Roof System Components description: How To Handle A Leaky Roof image: https://info.firstqualityroof.com/hubfs/LOGO-1.png --- ![](https://info.firstqualityroof.com/hubfs/blog-2019-img/FQ%20Logo-2.png) ![](https://info.firstqualityroof.com/hubfs/blog-2019-img/Call%20Today.png) [Call Us Today 702.262.7847](tel:7022627847) [Call Now 702.262.7847](tel:7022627847) ![](https://info.firstqualityroof.com/hubfs/blog-2019-img/phone.svg) - [Home](http://firstqualityroof.com) - [Why Choose Us](http://firstqualityroof.com/why-choose-us/) - [Home Tips](http://firstqualityroof.com/home-tips/) - [Testimonials](http://firstqualityroof.com/testimonials/) - [100% Financing Available](http://firstqualityroof.com/100-financing-available/) - [Super Service Award](http://firstqualityroof.com/super-service-award/) - [Services](http://firstqualityroof.com/services/) - [Roofing Systems](http://firstqualityroof.com/roofing-systems/) - [Image Gallery](http://firstqualityroof.com/image-gallery/) - [Contact Us](http://firstqualityroof.com/contact-us/) - [Employment](http://firstqualityroof.com/employment/) - [Blog](https://info.firstqualityroof.com/blog) [RoofRepairs](http://firstqualityroof.com/roof-repairs) ![](https://info.firstqualityroof.com/hubfs/blog-2019-img/header-links-bg-1.png) [RoofReplacement](http://firstqualityroof.com/roof-replacement) ![](https://info.firstqualityroof.com/hubfs/blog-2019-img/header-links-bg-2.png) [AtticInsulation](http://firstqualityroof.com/attic-insulation) ![](https://info.firstqualityroof.com/hubfs/blog-2019-img/header-links-bg-3.png) # Roof System Components Posted by [First Quality Roofing & Insulation](https://info.firstqualityroof.com/home-tip/author/first-quality-roofing-insulation) on Feb 15, 2024, 1:14:42 PM - [Tweet](https://twitter.com/share) All steep-slope [roof systems](https://firstqualityroof.com/) (i.e., roofs with slopes of 25 percent or more) have five basic components: 1. **Roof covering:** shingles, tile, slate or metal and underlayment that protect the sheathing from weather. 2. **Sheathing: **boards or sheet material that are fastened to roof rafters to cover a house or building. 3. **Roof structure:** rafters and trusses constructed to support the sheathing. 4. **Flashing:** sheet metal or other material installed into a roof system’s various joints and valleys to prevent water seepage. 5. **Drainage:** a [roof system’s design](https://firstqualityroof.com/) features, such as shape, slope and layout that affect its ability to shed water. 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