Transition Roof Tin Over Porch

Step 6 make a 10 degree bend on the shingle edge of the flashing approximately 1 2 inch from the edge.

Transition roof tin over porch.

Pitch transitions are a common roof detail. This is a fairly common roof detail. We see this quite frequently in log home roofs with porches for example. This allows water to flow off the upper panels out over the trim onto the lower panels and exits the roof at the eaves.

Attach the horizontal beam by using a nail gun. 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. 4 inches should go up the house wall and 4 inches should go on top of the porch roof shingles.

See the illustration below. The piece that allows us to join the two different slopes is the pitch transition trim. Use the metal break tool to bend the flashing lengthwise in the middle according to the angle of the roof joint. A roof pitch transition is a line in the roof plane that changes pitch.

Make a cutting on one of the sides of the horizontal roof beam on an angle. Most flashing is 8 inches wide. 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.