From the outside, roofing simply looks like a covering to protect a home from the elements. In reality, a complete system installed by roofing services has many layers, each with a specific duty. To fully appreciate how a roof works, you must understand the importance of each individual part installed or repaired by a roofing contractor and how it contributes to the overall function of the structure.
Rafters and Trusses
At the base of any roofing installation is the framework that supports the whole system. The top of the house consists of trusses and rafters to provide the structure for installing other materials. These components also frame out the attic space, which is important for providing insulation to the house and critical ventilation to the roof itself.
Decking or Sheathing
The next layer put on by a roofing services contractor is the decking or sheathing. Roof decking is usually made from plywood or oriented strand board (OSB) and laid over the trusses to cover them completely except for the area where the ends extend from the structure.
The decking must be securely attached since it provides the main support for the external materials that will be installed by the roofing contractor. Decking makes up the first layer of protection and is what keeps the structure dry and warm.
Underlayment
Underlayment is a water-resistant, breathable layer of specially-produced felt or synthetic fabric that adds a second layer of water resistance to the roofing installation. If moisture can find its way through the external materials, the underlayment will keep it from reaching the decking. Underlayment is breathable to prevent condensation under the decking and make sure that any moisture caught from the outside can dry.
Exterior Materials
Once a high-quality underlayment is secured to the decking, roofing services can then install the exterior materials. This base is used under all types of roofing, whether made up of asphalt, wood or slate shingles, metal panels, ceramic or concrete tiles, or other material.
This solid decking, protected by the underlayment, provides a strong surface onto which the materials can be layered and securely fastened. This ensures that they are watertight and can withstand the elements according to the durability and strength of the materials themselves.
Roof Vents
The final essential parts of every structure installed by a roofing contractor are the vents. Ridge vents are at the very top of a pitched roof and allow the hot rising attic air to escape from the space. Soffit vents are positioned under the finished ends of the trusses where they overhang the walls and facilitate ridge ventilation by drawing in cooler air from below. Together they keep enough air moving through the attic for the space to stay cool and dry. This prevents condensation, ice damming, and other problems caused by moisture and lack of air movement.
The next time you look up at your roof, think about the multiple layers of materials that go into its design. Whether this structure is in need of repairs by roofing services or needs brand new roofing, it is important to realize this process involves more than peeling off the old exterior material and putting down new.
An experienced roofing contractor will inspect all roof parts to look for signs of damage that could stress the entire system. To ensure your roof stays protective, all its parts must be in good condition so they can function together!
