The 7 inch length ensures a 2 inch headlap on each course.
Step flashing at roof height.
Flashing is a strip of metal usually aluminum about 8 inches long and bent at 90.
The 8 inch height prevents water from pouring over the top of the flashings into the building or system.
Step flashing needs to turn up a minimum of three inches up the sidewall.
Step flashing step flashing redirects the water back onto the shingle.
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.
Second step flashing needs to extend 8 to 14 inches above the shingles according to the national roofing contractors association nrca.
How to install roof flashing against a wall.
Next l shaped pieces of metal typically aluminum are placed under each shingle that butts up against the vertical wall.
This flashing is typically field fabricated from a sheet of 26 ga.
Vertical flashings must be a minimum of 8 inches above the completed roof surface.
This membrane attaches up the side of the wall as well.
Continuous flashing against a sidewall is one way to install a roof but it s not the correct way.
This layer is called the step flashing.
Once complete the housewrap should overlap the step flashing that s applied to the wall.
Step flashing is used where a roof meets a wall to cover the junction of those elements preventing leaks.
Galvanized sheet metal bent at a 90 degree angle i e.
Posted march 4 2017 filed under roof installation roof repair maintenance.
Step flashing size requirements vary according to manufacturer.
Even if one piece of step flashing fails the flashing and shingle below it start the process over again.
Roof felt should be installed prior to installing the step and kick out flashing.
The flashing material should be 4 inches by 7 inches in length when it lies on the roof deck.
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.
Step flashing is used to provide a water tight connection where roofing adjoins a vertical juncture.
Step flashing should be integrated with the drainage plane above for example overlap housewrap over it.
Step flashing if made of metal should be galvanized steel at least 0 019 inches thick irc 2015.
If this is a repair job the siding must also be removed and replaced with the flashing.
This height has become the industry standard and is recognized by most membrane manufacturers.
Bent into an l shape.
