Fort Worth roofing professionals understand the benefits for using and properly installing underlayment for shingle roofs. The underlayment operates as a water resistant barrier against an influx of moisture. It also protects shingles by separating them from wood resins that can degrade the quality of shingles over time. A roofing system with a correctly installed underlayment can function well for a long time.
To verify whether eaves flashing installation is necessary and that the correct underlayment attachment methods are being used, local building codes should be examined before any underlayment is applied. Residential building codes requirements will vary with geographic locations. Care should also be taken to adhere to the manufacturer's instructions and specifications for applying the products.
Roof underlayment should be applied over roof deck surfaces that are completely dry. Moisture on the underlayment should be removed to prevent damage to the shingles, such as wrinkling or buckling. Before the underlayment is installed, the deck has to be as flat as possible and free of any irregularities, such as cracks or deformations. The objective is for the underlayment to provide an even surface that is free of any indentations or creases so that the shingles can be applied properly.
Underlayment should completely cover the deck area and run parallel to any eaves. The edges of each row of underlayment should overlap the previous row by at least two inches to avoid gaps in coverage. If more than two pieces are needed to complete a row, there should be an overlap of at least four inches where the ends of each piece meets.
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The overlaps in each row should be staggered so that each overlap is at least six feet from the overlap in the next row of underlayment. There should also be a minimum of six inches of underlayment on either side of the slope at the ridges and hips of the roof, and it should extend up all vertical surfaces for at least four inches.
Although the methods used to attach roof underlayment vary and is determined by the wind uplift requirements for the geographic area, the most frequently used method is mechanical fastening. The manufacturer's requirements and the type of substrate will determine which type of nail or other fastener will be used. For wooden roof decks, the fasteners are generally placed every nine inches where the underlayment overlaps at the sides. For the middle rows of underlayment, two rows of fasteners are placed in the center every 18 inches. In some geographic locations, the use of fasteners can be reduced with the use of self adhering underlayment.
A properly installed underlayment is an essential feature of a well functioning roofing system. Complete and stable coverage of the roofing deck is the main factor for an effective use of underlayment. Homeowners should consult a roofing professional with any questions or concerns about underlayment on their roofs.