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1. 
   Piffin | Apr 07, 2002 11:57pm | #1

   Definitely not step flashing, that is designed to keep sneding water back out on top of the next course of shingles on a sloped roof. With a low ptch roof, you want a good watertight seal.

   Here is what I liked to do:

   Fasten down a layer of 30# or two half lapped layers of 15# felt. Then apply the metal flashing. I used ten foot long 4x4 which is galvanized sheet metal broke at 90 degrees with four inches on either side of the break. Lap peices at least four inches with plastic roof cement sealing the lap together. Nailed down about every four inches. (You don't want to let it move too much in thermal changes.) Then I bedded a layer of membrane in plastic cement along the edge of the flashing to seal it to the base felt. Then I applied the ninety pound roll roofing over it all with normal method being used.

   Another method is to use a cant strip and run the roll roofing up the wall.

   Excellence is its own reward!