A leak in a roof can come from several areas, and where it appears in the attic may not relate to where it started. One reason for this is the various layers of materials used in many roofing methods. Another is the way the shingles are overlapped. However, some roof leaks occur around roofing details such as attic vents and flashing. It is possible to reduce the chance of roof leaks by having it inspected by reliable Roofing Contractors in Gig Harbor. Some things the inspection should cover include the quality of the shingles, the integrity of the decking, and the caulking that prevents moisture from seeping around the metal flanges of attic vents.
The typical residential roof begins with a layer of decking secured to a skeleton of rafters and joists. The two most common types of decking are OSB (oriented strand board) and plywood. Both are engineered materials held together with resin, but the way they are made differs. Plywood is created using multiple layers of thin veneers, and the grain of each veneer layer is alternated to give the lumber strength. OSB uses thin wafers of wood placed in complimentary patterns to reduce the chances of weak areas. Both materials are cured under extreme pressure, which is one reason these materials expand if the wood becomes saturated. Damaged decking is usually noticed when the shingles begin to cup. That is, the shingles are pushed up from the bottom because swollen fibers in the decking are applying pressure to them. This kind of problem can be an expensive repair because large portions of the roof may need to be exposed.
A common reason for roof failure is old shingles. Asphalt shingles can suffer damage as the oils in them dry out. They can also develop issues from heat accumulating beneath them. Attic vents can help but, when the attic is finished or heavily insulated, the heat can get trapped. Newer composite shingles can help because they are designed to handle these kinds of problems. A better ventilation system may also be necessary, such as a crown vent. Expert Roofing Contractors in Gig Harbor can install a special vent that runs the length of the roof so any excess heat is eliminated.
