Water should run down the side of the flashing and be directed to the shingles instead of finding its way into the roof deck.
Flashing shingle roof detail.
This drip edge flashing provides protection from water damage along the eaves and rake of a roof.
The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide.
Step flashing redirects the water back onto the shingle.
Continuous flashing against a sidewall is one way to install a roof but it s not the correct way.
That is the drip edge flashing is the first item installed onto the roof sheathing or atop old shingles in a multi layer shingle re roof job.
Edge flashing and starter strip 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 details roofing wrb flashing.
Even if one piece of step flashing fails the flashing and shingle below it start the process over again.
Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels.
At the end of the vertical sidewall the step flashing shall be turned out in a manner that directs water away from the wall and onto the roof and or gutter.
Details roofing wrb flashing storm proof roof 2.
If you install the drip edge on top of the felt any condensation or water running down the roof surface between shingles and felt will run underneath the drip edge down the fascia and perhaps into the building soffit or walls not a nice thing.
If there were no flashing against these walls water could slowly drip into the crevice between the wall and the roof and potentially into the home.