Headwall Flashing With Siding

Posted march 4 2017 filed under roof installation roof repair maintenance.

Headwall flashing with siding. This has proven problematic over time as caulking the joint results in unsightly surface appearances due to the different textures as well as resulted. Flashing should overlap the roof covering material but on asphalt shingle roofs for aesthetic reasons the part of the headwall flashing that extends down over asphalt shingles is often covered with a course of shingle tabs. The headwall flashing in the 2nd pic however seems like it s not going to work since it is outside the siding and it doesn t appear there is any sealant at the top of it. The flashing needs to be installed before installing the roof shingles.

Unless already installed a water resistive barrier should be applied to the house prior to installing vinyl siding. Galvanized sheet metal bent at a 90 degree angle i e. Don t mistake this condition for headwall flashing routed beneath the shingles and call it a defect. A common problem with cement board siding products and some other types of horizontal lap siding is that older installation guidelines called for caulking the joint instead of flashing the joint.

A headwall is defined by the junction between a sloped roof and a wall. Refer to important notes for more information on water resistive barriers. The metal flashing is formed with a hook edge and cleated on 12 centers. Flashing against the headwall should be counter flashed a minimum of 2 with house wrap or other flashing and then covered with the finish wall cladding laps in the headwall flashing should be 3 minimum and the overlapping end set in a double bead of sealant.

The flashing extends up the wall at least 4 the flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas. In the last picture you can see they caulked between the wood shingle siding joints suggesting they had water damage inside below that are confirmed by old. Bent into an l shape. Step flashing is used to provide a water tight connection where roofing adjoins a vertical juncture.

On metal roofing systems a headwall flashing is designed to hook on the j channel or z channel and extend up behind the wall exterior while in shingle and slate roof the headwall sits on the first. This flashing is typically field fabricated from a sheet of 26 ga. Vinyl siding is an affordable and low maintenance first line of protection against the weather. It gets a bad wrap.