Flashing Over Or Under Roof Roll

Nonetheless roll roofing installations will have a longer life if installed according to the product manufacturer s instructions nailed at proper intervals and with seams properly sealed.

Flashing over or under roof roll.

The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. They also cover the edges of the plywood that hang over the sides of the building with corner shaped flashing called drip edge. Open valleys have metal flashing to protect this critical area of the roof. Take care not to place any fasteners in the exposed center area of the metal flashing.

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. Vent ridge roll flashing model decov39b 96 00 box 96 00 box free delivery. Builders use roofing felt or tar paper for this. Set your store to see local.

Cut bottom of flashing so the entire width of the valley flashing extends approximately 1 2 to 3 4 over the fascia trim board along eaves. Our photo above shows what we ask of roof edges. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Usually you won t see much of drip edge as it s under the roof shingles under the underlayment and behind the roof gutter.

It s also important to install roll roofing over a smooth sound roof deck. Extend entire width of flashing completely to the bottom of the roof valley. The sketch above illustrates the end profile of roof drip edge flashing and shows its placement on the roof. Where to install roof flashing on an asphalt roll roof.

The shape of vent flashing is typically a cylinder with a wide flange at the base which is lapped into the shingles as the roofing is installed. The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide. Use a generous width of polymer added bituminous asphalt sheeting for flashing under asphalt roll roofs. Flashing against a vertical sidewall shall be by the step flashing method.

Make the finished joints smooth so the asphalt roll roofing will lie flat over them. Aluminum roll drip edge aluminum flashing less than 15 in. Vent pipe flashing fits over flues or pipes. But where no gutters are installed you might get a peek.

It protects the edges of the plywood and prevents water from seeping underneath the soffits or underside of the overhanging roof and staining or damaging the siding. Install flashing at roof valleys around dormers vents skylights and chimneys.