Metal Shingle Roof to Flat Roof Tie-In

Steve Tonnesen
I have a typical Florida suburban tract home with a 29 square 4/12 pitch gable roof that ties into a flat porch roof. The roof peaks form a T, resulting in two valleys. There are no hips. At the bottom of one of the valleys is the inside corner of a flat roof on the porch. The flat roof measures about 10' x 20'. I would like to replace the asphalt shingles with metal shingles, probably stone coated galvalume, but I cannot figure out how to tie into the flat roof, as the flat roof will need to be replaced every 15 years or so while the metal shingles will last over 50. Will I really need to dissasemble the roof tiles all the way down from the peak just to get new flat roofing material tucked under the metal shingles? There has to be a better way. I am looking for information as to how to do this, and would appreciate any good advice or links to good advice.
Todd Miller
Isaiah Industries, Inc.
The best way to handle such things is to have a 6" or so drop from the main roofs to the porch roof. Sounds like that isn't the case with your home though. With many metal shingle systems, the eave starter detail allows for the bottom panels to be lifted if necessary and then put back down. Check with the manufacturer of your roofing to see if this can be done. The other option is to work in a large sheet metal flashing which goes under the metal shingles and out on top of the flat deck. When the flat roof needs to be replaced, the flashing can be lifted so the new roofing can be worked in beneath it. Then the flashing is secured back down.
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