Roof To Wall Step Flashing Detail

Factory shingle cut against the wall minimum 12 butted up snug.

Roof to wall step flashing detail.

The flashing material should be 4 inches by 7 inches in length when it lies on the roof deck. Next install the step flashing with the next course of shingles over top of it. If you wanted to horizontal caulk it would only be at the top of the flashing. Flashing joints are lapped 6 in the direction of water flow.

Guide to step flashing at building roof wall intersections. N at roof to wall intersections see figure 1. On a high wind wall low pitch vertical caulk at the roof edge of the flashing for insurance. Same type of metal as the flashing material.

Step flashing redirects the water back onto the shingle. N tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape. Kick out flashing is a piece of flashing that hangs over the edge of the roof helping to divert water away from the adjacent wall or around any obstacles that the roof may butt into. It may seem as if a single piece of flashing would offer more protection than many pieces of step flashing.

Integrate all step flashings with the sidewall sheathing wrap by slipping the upper legs of the step flashing under the sheathing wrap figure 1 6 at left. Even if one piece of step flashing fails the flashing and shingle below it start the process over again. Where snow buildup is anticipated add a band of peel and stick membrane over the step flashing but under the sheathing wrap as shown. N use flashing cement at joints to help secure flashing.

This process will continue up the entire roof. Step flashing needs to turn up a minimum of three inches up the sidewall. The flashing extends up the wall at least 4. N use step flashing that has a 2 to 4 inch lon ger vertical leg than normal.