Roof Underlayment Flashing Install

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

Roof underlayment flashing install.

Install final flashing material. 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. Start by laying asphalt felt or other underlayment over the roof. Cap staples are recommended on this underlayment every 12 inches along the bottom and every 24 inches in the middle.

Seal with adhesive sealant or tape as described in section 6. You ll have to overlap shingles as you go much like weaving. These pieces act as a weather proofing and protective barrier between your house and the elements helping keep water and cold temperatures out. Nail metal drip edge flashing which bends over the roof and down the edge of the facing board on all roof edges.

Apply an approximately 3 inch. Install underlayment a minimum of 6 inches up roof protrusions or vertical abutments. Recommended procedures of basic valley flashing installation. 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.

Do not drive nails into the flashing. Pry away the siding and slip the felt under the siding. To make corner flashing take your tin snips and cut a 45 degree line from an outside corner to the center fold. 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. Where the roof meets a wall lap the felt up 4 inches if possible. Then install shingles on the other side. In some situations you may have to temporarily remove the siding and replace it after installing the underlayment shingles and flashing.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Then install a non corrosive metal valley flashing of 24 minimum width. Installing roof felt is a two person job. With underlayment and flashing installed apply shingles up to one side of the flashing.

Now it s time to install the underlayment and flashing. Again do not drive nails through flashing. With a clean valley you can lay down some peel and stick roofing membrane. In that installation the lower edge of the felt must be on top of not underneath the drip edge.