Roof Underlayment Flashing Install

Fold the top over the roof ridge and cut the bottom along the drip edge metal.

Roof underlayment flashing install. But first we re going to flash the eave with metal drip edge flashing and install the roofing membrane over it along the bottom edge of the roof. That is the drip edge flashing is the first item installed onto the roof sheathing or atop old shingles in a multi layer shingle re roof job. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. With a clean valley you can lay down some peel and stick roofing membrane.

To make corner flashing take your tin snips and cut a 45 degree line from an outside corner to the center fold. Install underlayment a minimum of 6 inches up roof protrusions or vertical abutments. Cap staples are recommended on this underlayment every 12 inches along the bottom and every 24 inches in the middle. Start by laying asphalt felt or other underlayment over the roof.

With underlayment and flashing installed apply shingles up to one side of the flashing. Pry away the siding and slip the felt under the siding. Install your underlayment completely and your shingles up to where the wall begins so that the first piece of flashing or the corner flashing will rest on a shingle. Install final flashing material.

Then install a non corrosive metal valley flashing of 24 minimum width. Fasten drip edge on eaves with. In some situations you may have to temporarily remove the siding and replace it after installing the underlayment shingles and flashing. Where the roof meets a wall lap the felt up 4 inches if possible.

Do not drive nails into the flashing. Installing roof felt is a two person job. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Recommended procedures of basic valley flashing installation.

You ll have to overlap shingles as you go much like weaving. Seal with adhesive sealant or tape as described in section 6. These pieces act as a weather proofing and protective barrier between your house and the elements helping keep water and cold temperatures out. Install an underlayment centered in the roof valley.

Apply an approximately 3 inch. Using your staple gun secure the felt to the roof. Then install shingles on the other side. Nail metal drip edge flashing which bends over the roof and down the edge of the facing board on all roof edges.