Apply a vertical bead of caulk as shown.
Roof step flashing detail.
Step flashing redirects the water back onto the shingle.
Step flashing is a rectangular piece of flashing bent 90 degrees in the center.
Sweat the details or you ll drown in them this presentation is by doug horgan vp of bowa a design build remodel and consultation company in northern virginia.
Stepped flashing is used where a sloped shingled roof intersects a vertical wall.
Roof wall flashing detail specifications snafus.
Continuous flashing is sometimes seen where a roof meets a sidewall but in the long run step flashing will do a better job of preventing water leaks.
Step flashing protects the gap where roofs meet walls by weaving into the roof shingles.
Multiple pieces of the flashing will be installed in layers with shingles to ensure the water flows away from the wall.
Step flashing protects the interface between a roof and a wall from water leaks that can cause hidden damage for years.
The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide.
The base is then covered by another metal flashing piece lapped over it.
This roof ends in a peak.
Step flashings are interwoven with the shingles and act essentially as shingles with an upturned leg to allow a transition of the vertical drainage plane of the wall to the drainage plane of the roof.
Drive one nail to hold it in place.
At the bottom of the roof water needs.
Even if one piece of step flashing fails the flashing and shingle below it start the.
The second piece should not be fastened to the base so the two pieces can move against each other independently when the roofing materials shift.
At the end of the vertical sidewall the step flashing shall be turned out in a manner that directs water away from the wall and onto the roof and or gutter while this is a nice diagram of how these flashings work don t forget our 5 th design rule.
For the first side cut the step flashing along the fold line and bend down the lower flap.
Rain should run off the roof and into the gutter.
Step flashing can be made with aluminum copper lead galvanized steel or.
Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley.
Below are two photographs of roof wall step flashing completed and effective of a slate roof against a brick wall below left and in process with step flashing against a dormer sidewall before the dormer siding has been put in place below right.
