Roof Vent Flashing Over Or Under Felt

This material is available with a v or w shaped profile and is placed over the top of the building felt before the roof s finishing material is installed.

Roof vent flashing over or under felt.

Drip edges prevent water from seeping under roofing along the edges of rakes and eaves. Step flashing fits to each course of shingles and appears to step up the wall of the chimney. Then nail the new l shaped flashing under the builder s felt but above the fascia board. Drip edges on the eaves any valley liners and all flashing should be installed before the tar paper is laid.

Understanding the proper way to install the drip edge will only get you so far. They re applied under roofing felt along eaves and over roofing felt along rakes. Chalk lines should be snapped 33 5 8 above the eave line. After this lines should be snapped every 34 as you move up the roof.

Continuous flashing protects the joint between a vertical wall and a sloped roof. Does drip edge go over or under felt. According to most building codes and manufacturer recommendations the drip edge should be installed beneath the underlayment along the eaves of the roof. Once you have installed shingles just past a plumbing vent install the flashing piece so it will lie on top of roofing at its bottom but be covered with roofing at its top.

If the felt butts into a wall that has flashing on it and the wall is running perpindicular to the felt the felt is typically placed under the flashing. The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide. Step flashing protects the joints between the roof deck and chimneys or dormers. Lay it over metal flashing edges around vents and pipes.

Flashing is installed to surround roof features such as vents chimneys and skylights. But over the underlayment along the rake edges of the roof. Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer. Before laying roof felt all rotten decking must be replaced.

Depending on the width of the pipe you may need to tear away a segment or two of the rubber boot. Use roofing nails to install the l shaped flashing flush with the roof and wall then cover it with roofing cement and reattach the roofer s felt. Then the felt would be under the flashing. Fit felt around vent pipes or other protrusions by cutting it with a utility knife and fastening around the bottom of the vent.