Should flashing be above or below shingles?
Should flashing be above or below shingles?
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.
Is valley flashing necessary?
Closed valleys aren’t required to have metal flashing, but they should have additional underlayment lining the valley, preferably a couple layers of roll roofing. You can usually see whether this has been done by looking carefully at the bottom edge of the valley.
What is a valley flashing?
W-Valley Flashing protects the critical area of your roof where two slopes come together to form a valley. When properly installed, W-Valley Flashing will reliably channel run-off water down the roof and into the gutter.
Where do I install flashing?
Flashing is installed to surround roof features, such as vents, chimneys and skylights. Water should run down the side of the flashing and be directed to the shingles instead of finding its way into the roof deck.
How far does flashing need to go under shingles?
Typically, 10- by 8-inch (253 mm x 203 mm) flashing is chosen. Those 8 inches are more than enough to cover the exposure of typical shingles.
Should flashing be visible on roof?
Roof Flashing Is Not Always Visible: While some areas are exposed and fairly obvious, like where shingle meets brick, others may be hidden behind siding or other roofing materials. It is always a good idea to hire professional. They can better identify if your roof flashing needs work.
How much do you overlap step flashing?
Because the flashing is 2 inches wider than the exposure of the shingles, each step flashing piece will overlap the one on the course below by 2 inches. Nail the flashing to the roof deck only. Do not nail it to the wall. Bring siding down over the vertical sections of the step flashing to serve as counterflashing.
Should roof valleys have flashing?
The valleys see the most water flow, as water from both surfaces gathers in the valley as it runs down. The extra layer of flashing in the valley helps protect it from water intrusion. Metal flashing, which is most often used, also helps the water move more quickly off the roof, and even the occasional snow.