Flashing 2 Roofs Together

Slide the right edge of the flashing under the highest roof pitch.

Flashing 2 roofs together. Slide the flashing under the highest roof pitch first and followed by the lower pitch. The base flashing or apron flashing is the bottom piece. Now nail this first flashing at both its far ends. Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present.

Next put the flashing between two roof pitches. Position the flashing between the two roof pitches. This is where joining two pitched roofs together starts. Well engineered and properly installed two part flashing can handle this movement with no problem.

When the roof materials naturally expand and contract with weather changes the two pieces can move so the whole system stays secure. Roofs peel off from the edges so it is critical to hold them tight with the roof deck sealed on the outside we turn to flashing the edges with metal and membranes metal drip edge flashing image details roofing wrb flashing. Finish by nailing osb sheathing metal flashing metal drip edge and overlap the new shingles between two joined roofs. Remember to caulk the underside of the flashing with a sealant.

Joining two roofs with different pitches. The flashing materials will continue to be leak proof if they can withstand this movement of the roofing materials. Two part flashing systems consist of a base flashing often step flashing that is laced into the finished roof material. To bend the flashing use a 2 by 4 lumber by pressing it gently until the flashing gets bent and matches the slope.

A quick video on joining two roofs together. Below are the steps on how to join two roofs together if they have different pitch. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Place the 2 by 4 inch piece of lumber along the center of the flashing.

Step 6 install the flashing. There is another benefit to two part flashing. Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes.