The roof is a primary focus when sealing a home exterior. A good underlayment is the first step. This protects the oriented strand board from moisture and enables the roof to endure difficult weather. Underlayment is typically used as a layer between decking and the final roof covering. Since it must provide enhanced protection, choosing the proper underlayment is important.
You will need:
Step 1: Traditionally, asphalt-impregnated felt paper was the preferred underlayment material. Modern materials are more reliable in situations of ice damming and severe weather. Since felt paper tears easily, its bond with roof decking can be compromised. A newer material is peel and stick roof underlayment. This tears less easily and results in a tighter weatherproof seal on the roof. It can be applied to the whole roof or just to the area most vulnerable to the weather. This underlayment is currently considered the best material and it is sold as a roll.
Step 2: Put on the work shoes and place the extension ladder against your home, near the work area. Extend the ladder to your roofline, getting help if needed. Ensure that the ladder is secured before climbing it. If the roof has a slope that rises more than six inches for each one-foot horizontal, use roof brackets and wood boards for additional footing support.
Step 3: Verify that the attic has adequate ventilation so your roof can breathe.
Step 4: Install the peel and stick style roof underlayment between the roof decking and covering. The application process is the same as that for traditional underlayment, aside from nailing, which is not required because one side of the material is adhesive. Unroll the underlayment, beginning at the bottom of your roof and working in a horizontal direction. Remove the adhesive backing and adhere the underlayment while working along this horizontal. Have someone provide assistance by unrolling the underlayment as you remove the backing and adhere the underlayment to your roof.