Proper Installation Of Roof Underlayment

Install new flashing metal.

Proper installation of roof underlayment.

Ideally the roof covering material would be installed as soon as possible but in reality the roof may be protected by only the underlayment for days weeks or sometimes months. Roof underlayment prevents the roof deck from being exposed to the elements before or while the roofing material is being installed. On roofs with a slope of 4 12 or greater use a single layer of 15 lb. It s not ideal to install roof underlayments when the temperature is under 40 degrees f as it won t ensure a proper fit.

Start by unrolling a 10 to 15 foot piece of membrane leaving the release liner in place. Carefully cut the release liner on top of the roll in the cross direction being careful not to cut the membrane. What is the best temperature to install a roof underlayment. Install drip edge at the roof eave edges.

Synthetic underlayment must be installed above properly ventilated attic spaces follow local building code as it is. Align the membrane and roll in. Nail metal drip edge flashing which bends over the roof and down the edge of the facing board on all roof edges. Asphalt saturated felt starting at the eaves and lapping upper courses over lower by a minimum of 2 inches.

Check this out. I want to be. Overlap each row at least 3 to 4 inches. Synthetic roofing underlayment is to be laid horizontally parallel to.

Using your staple gun secure the felt to the roof. Underlayment flashings and shingles all work together and must be installed in the correct order. Installing roof felt is a two person job. Do not use felt as a temporary protection against rain.

If you lay the felt perfectly straight you can use its lines instead of horizontal chalklines to align the shingles. How to install roofing underlayment the proper way. Vertical joints should lap a minimum of 4 inches and be offset by at least 6 feet in successive rows see figure 2 2 at left. Lap allowance.

Peel back about 6 inches of the release liner in the opposite. Start by laying asphalt felt or other underlayment over the roof. Fasten drip edge on eaves with. Here is a video about roofing underlayment.

If it gets wet it will wrinkle making it harder to shingle.