Transition Roof Tin Over Porch

Make a cutting on one of the sides of the horizontal roof beam on an angle.

Transition roof tin over porch.

Attach 3 by 3 foot sheets of tin to each section of the frame using 1 inch steel hex washer head screws and a cordless drill. We see this quite frequently in log home roofs with porches for example. We re going to install it over top of the panels that have already been installed on the lower slope. 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. 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. The roof plane goes from one pitch to a lower pitch. Most flashing is 8 inches wide.

This is a fairly common roof detail. Pitch transitions are a common roof detail. After that to make it flush with the roof of the existing house cut the two outer rafters. See the illustration below.

Use the metal break tool to bend the flashing lengthwise in the middle according to the angle of the roof joint. 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.