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.
Headwall flashing with siding.
The flashing needs to be installed before installing the roof shingles.
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.
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.
Vinyl siding is an affordable and low maintenance first line of protection against the weather.
Install flashing before starting to apply the siding.
It gets a bad wrap.
Posted march 4 2017 filed under roof installation roof repair maintenance.
Step flashing is used to provide a water tight connection where roofing adjoins a vertical juncture.
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.
Unless already installed a water resistive barrier should be applied to the house prior to installing vinyl siding.
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.
Bent into an l shape.
Galvanized sheet metal bent at a 90 degree angle i e.
This has proven problematic over time as caulking the joint results in unsightly surface appearances due to the different textures as well as resulted.
The metal flashing is formed with a hook edge and cleated on 12 centers.
Refer to important notes for more information on water resistive barriers.
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.
Consult your local building code for requirements in your geographic area.
Flashing this area of a roof correctly is very important to avoid leaks.
