Step Flashing At Roof Height

This membrane attaches up the side of the wall as well.

Step flashing at roof height.

The vertical side will be hidden behind the exterior wall covering material. The 7 inch length ensures a 2 inch headlap on each course. Even if one piece of step flashing fails the flashing and shingle below it start the process over again. Step flashing is used where a roof meets a wall to cover the junction of those elements preventing leaks.

One side of the l shape lays under the shingle and the other side attaches to the side of the wall. Once complete the housewrap should overlap the step flashing that s applied to the wall. Continuous flashing against a sidewall is one way to install a roof but it s not the correct way. Step flashing needs to turn up a minimum of three inches up the sidewall.

Step flashing is used to provide a water tight connection where roofing adjoins a vertical juncture. Flashing is a strip of metal usually aluminum about 8 inches long and bent at 90. First step flashing must be installed before the siding so that the siding can cover the top of the flashing. This flashing is typically field fabricated from a sheet of 26 ga.

Step flashing should be extended at least 4 inches up the wall from the roof deck and at least 4 inches out along the roof deck 2015 international residential code irc. How to install roof flashing against a wall. Posted march 4 2017 filed under roof installation roof repair maintenance. Step flashing if made of metal should be galvanized steel at least 0 019 inches thick irc 2015.

Step flashing should be integrated with the drainage plane above for example overlap housewrap over it. Roof felt should be installed prior to installing the step and kick out flashing. Step flashing step flashing redirects the water back onto the shingle. If this is a repair job the siding must also be removed and replaced with the flashing.

The flashing material should be 4 inches by 7 inches in length when it lies on the roof deck. Vertical flashings must be a minimum of 8 inches above the completed roof surface. Galvanized sheet metal bent at a 90 degree angle i e. Manufacturers requirements can vary anywhere from 2 inches to 10 inches and you probably won t be able to see the sidewall flashing completely anyway.

Next l shaped pieces of metal typically aluminum are placed under each shingle that butts up against the vertical wall. This height has become the industry standard and is recognized by most membrane manufacturers. Bent into an l shape. This layer is called the step flashing.