Roof To Wall Step Flashing Detail

Step flashing redirects the water back onto the shingle.

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. Step flashing needs to turn up a minimum of three inches up the sidewall. 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 at roof to wall intersections see figure 1.

Flashing joints are lapped 6 in the direction of water flow. N tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape. The metal flashing is formed with a hook edge and cleated on 12 centers. 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. Even if one piece of step flashing fails the flashing and shingle below it start the process over again. If you wanted to horizontal caulk it would only be at the top of the flashing. The flashing extends up the wall at least 4.

Guide to step flashing at building roof wall intersections. 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. N use flashing cement at joints to help secure flashing. Same type of metal as the flashing material.

Factory shingle cut against the wall minimum 12 butted up snug. Next install the step flashing with the next course of shingles over top of it. N use step flashing that has a 2 to 4 inch lon ger vertical leg than normal. On a high wind wall low pitch vertical caulk at the roof edge of the flashing for insurance.