Transition Roof Tin Over Porch

Pitch transitions are a common roof detail.

Transition roof tin over porch.

Screw the steel hex washer head screws into the tops of corrugated waves of tin roofing material to prevent leaking through screw holes at the bottoms of the waves when rain runs down the roof. Make a cutting on one of the sides of the horizontal roof beam on an angle. This is a fairly common roof detail. The piece that allows us to join the two different slopes is the pitch transition trim.

See the illustration below. We re going to install it over top of the panels that have already been installed on the lower slope. You have to do it thoroughly so that the rafters sit flush on it. Step 6 make a 10 degree bend on the shingle edge of the flashing approximately 1 2 inch from the edge.

A roof pitch transition is a line in the roof plane that changes pitch. Use the metal break tool to bend the flashing lengthwise in the middle according to the angle of the roof joint. After that to make it flush with the roof of the existing house cut the two outer rafters. The roof plane goes from one pitch to a lower pitch.

4 inches should go up the house wall and 4 inches should go on top of the porch roof shingles. Attach the horizontal beam by using a nail gun. This allows water to flow off the upper panels out over the trim onto the lower panels and exits the roof at the eaves.