Metal is growing more popular in residential roof repair and replacement. It’s mostly due to its durability, fire and wind resistance and ease of maintenance. However, it must be installed correctly with the proper metal roofing underlayment.
Here are things you need to understand metal roofing underlayment.
Ice Dam Prevention
Begin the metal roofing underlayment with a layer of ice guard or ice and water shield to prevent ice dams. It should be at least two feet up the roof from the upper edge of the overhang. Start the installation by making a chalk line 35 ½ inches above the edge of the roof and lay the ice guard along the line. It will provide the 36-inch ice guard a half-inch overhand from the eaves. Add a second strip of the material if needed.
Felt paper or building paper prevents leaks in the attic and slightly improves insulation. Building codes may indicate a specific weight of felt paper, usually around 30 pounds. Metal roofing underlayment requires an extra slip sheet later, which is usually a red rosin paper. It helps the metal from sticking to the felt paper during roof installation.
Your roofer may also use polymer underlayments sheets, which are thinner and easier to use than tar paper and rosin paper. These sheets are durable, waterproof and slick.
The strips of felt paper or polymer underlayment are added horizontally across the roof, making sure the layers overlap by at least four inches. Every strip is stapled at the ends and once per square foot in the middle of the strip. Roofers overlap the metal roof underlayment generously where two parts of the roof meet in a valley.
Proper metal roof underlayment prevents moisture problems in your attic. Hire an experienced roofer for your metal roof installation like Carney Roofing Company. Our roofing professionals also specialize in storm damage repair services. Call us at (936) 307-0900 or fill out our online form to get a free estimate. We serve homeowners in Omaha, NE and areas around Nebraska.