Roof Step Flashing Detail

Roof wall flashing detail specifications snafus.

Roof step flashing detail. For the first side cut the step flashing along the fold line and bend down the lower flap. This roof ends in a peak. Drive one nail to hold it in place. Step flashing protects the gap where roofs meet walls by weaving into the roof shingles.

Step flashing redirects the water back onto the shingle. 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. The base is then covered by another metal flashing piece lapped over it. Step flashing is a rectangular piece of flashing bent 90 degrees in the center.

Apply a vertical bead of caulk as shown. Even if one piece of step flashing fails the flashing and shingle below it start the. Multiple pieces of the flashing will be installed in layers with shingles to ensure the water flows away from the wall. Step flashing can be made with aluminum copper lead galvanized steel or.

Step flashing protects the interface between a roof and a wall from water leaks that can cause hidden damage for years. Two part flashing systems consist of a base flashing often step flashing that is laced into the finished roof material. 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. Stepped flashing is used where a sloped shingled roof intersects a vertical wall.

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. The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide. 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. Once you ve come up the other side with step flashing and shingles you re ready to put on the final piece.

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. It is used for roof to wall flashing. At the bottom of the roof water needs.