Step Roof Flashing Details

Step flashing protects the interface between a roof and a wall from water leaks that can cause hidden damage for years.

Step roof flashing details. Step flashing redirects the water back onto the shingle. Stepped flashing is used where a sloped shingled roof intersects a vertical wall. Counter flashing is the final layer of a three part waterproof barrier installed between a roof and a vertical wall or chimney. 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 can be made with aluminum copper lead galvanized steel or. It is used for roof to wall flashing. Even if one piece of step flashing fails the flashing and shingle below it start the. L flashing can be cut into smaller lengths to use as step flashing.

Two part flashing systems consist of a base flashing often step flashing that is laced into the finished roof material. 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. Step flashing is a rectangular piece of flashing bent 90 degrees in the center. So we instruct our roofers to run the ice barrier membrane and the roof underlayment up the sidewalls.

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. We ask for 6 inches up the wall. 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. Made with 28 gauge galvanized steel l flashing can play an essential part in protecting your home against water damage.

Rain should run off the roof and into the gutter. 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. At the bottom of the roof water needs. Step flashing protects the gap where roofs meet walls by weaving into the roof shingles.

It is used for roof to wall flashing. Multiple pieces of the flashing will be installed in layers with shingles to ensure the water flows away from the wall. The first two layers are called base flashing and step flashing. Wind driven rain and snow can penetrate between step flashing pieces and wet the sidewalls and the roof.

L shaped flashing is a versatile general use flashing used where a uniform or strengthened finish is needed on a 90 surface.