Greeley Roofing: Article About Roof Layers
Much like how an umbrella, hat and sunglasses protect people from the ravages of weather, a roof is a home's state-of-the-art protective system. It keeps snow, ice and rain out of the home's interior, and it shelters its residents from heat, damaging ultraviolet radiation, allergens and pollutants. With such a critical role in protecting the home and its inhabitants, today's residential roofs are expertly engineered and integrated systems that are a result of years of research and development. And with a home's durability and integrity at stake, homeowners should understand how a roof's layers are constructed to provide optimum protection against the elements.
A roof system is more than just a compilation of shingles. It's a layered set of structural supports and high-tech materials, each designed for its own particular role. These integrated roofing systems require skilled, experienced construction, like the expertise found with a trusted Greeley roofing contractor.
Most roofs weigh three to four tons, so the strength of the supporting structure is important. In most homes, a roof's first layer is its framework of trusses that span and connect the home's walls. Plywood sheets are nailed to the trusses, creating the solid roof deck that is the surface for all of the subsequent roof layers.
Once the roof deck is secure, self-adhesive waterproof sheets are attached to the plywood to protect it from water and to seal over nail divots.
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The waterproof sheeting barrier is important to prevent leaking, rotting and warping of the plywood.
Next, drip edges are applied to roof rims, or rakes. Made of vinyl, plastic or metal, drip edges help direct water away from the roof and into the gutter, where it can deposit away from the home's foundation.
Broad strips of tar paper are then layered over the entire surface of the roof for additional protection. The tar paper, or felt, is overlapped a couple of inches along the edges to prevent water seeping under the layer.
The roof's joints, peaks and valleys are the next to be treated, as they are often the most susceptible to weather and water damage. Water-resistant flashing is nailed down in those spots, and roofing cement is used to seal the nail holes. Flashing edges are then sealed to create a tight barrier.
Once the two substrates, drip edges and flashing are installed, the roof is ready for shingles or tiles. Asphalt shingles will be nailed to the roof's substructure in a fish scale-type pattern for extra water resistance. After the shingles are laid on the roof surface, they are applied to the roof hips and ridge lines as the final step of protection.