Flashing Porch Roof To Asfault Roof

Notice in the image above that the end of an asphalt roof extends outward just a bit covering and protecting the wood beneath it as it should.

Flashing porch roof to asfault roof.

Flashing should overlap the roof covering material but on asphalt shingle roofs for aesthetic reasons the part of the headwall flashing that extends down over asphalt shingles is often covered with a course of shingle tabs. Use a metal break tool to bend the flashing according to the angle of the roof joint. Open valleys have metal flashing to protect this critical area of the roof. 4 inches should go up the house wall and 4 inches should go on top of the porch roof shingles.

Don t mistake this condition for headwall flashing routed beneath the shingles and call it a defect. Flashing is generally 8 inches wide with 4 inches going on the wall of the house and 4 inches going on the top of the roof shingles. Installing step flashing to prevent roof leaks step flashing spans the joint between roof shingles and an adjacent side wall. Gently hammer the 45 degree cut around the corner of the porch roof seam.

While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Use the metal break tool to bend the flashing lengthwise in the middle according to the angle of the roof joint. The corner cut should be facing upwards. The wood beneath it is called the fascia board or rake of the gable the fascia board is colored in blue in the image above.

Cut the flashing with tin snips if you need to cut it. You need to make a bend of 10 degrees one half inch from the edge. Lay the cut flashing down at the corner over a shingle that is already in place. Position the flashing with the lower edges atop the carport roof panels along the transition.

Here s how to install it correctly. Vent flashing done right to prevent leaks back up roof vent boots with flashing counterflashing and proper shingling. Step 6 make a 10 degree bend on the shingle edge of the flashing approximately 1 2 inch from the edge. The decorative trim under the roof is not covered up with flashing.