How To Replace Pipe Flashing On Existing Roof

How to retrofit the ultimate pipe flashing on an existing roof.

How to replace pipe flashing on existing roof.

Replace all rubber boots and replace metal. Center the pipe in the flashing and push the flexible front corners up or down so that the flashing pipe is parallel to the vent pipe. Now press the aluminum flashing flush to the shingle surface. You don t need to bend back the shingle that s beneath the pipe.

Then nail the new l shaped flashing under the builder s felt but above the fascia board. Penetration flashing plumbing vent pipes that extend through the roof come with metal flashing or rubber boot type flashing to seal the penetrations. 1 remove nails holding down shingles above the pip. Nail the bottom two corners about an inch in from each side the same position as when you took the flashing off.

Begin by removing the shingles at the affected area and removing old flashing if present. Pull the old flashing up over the vent pipe and scrape any old caulk and debris off the roof. 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. How to retrofit the ultimate pipe flashing on an existing roof.

When a roof leaks the problem is often due to leaks in and around the metal roof flashing that protects roof edges valleys and the junctions between roofing and obstructions such as chimneys dormers and vent pipes. The flashing is nailed to the roof and it is critical that the nail placement is proper or it will result in leaks. In fact after diagnosing roofing leaks for 15 years i can tell you that roofs rarely leak in the field of the shingles 90 of the time they leak where the roof stops starts or changes direction which means most of the time the problem is with a flashing. This gizmo costs more than the cheap ones but works well and should never leak since such a great design.

You can bend them back by working a putty knife under the bottom of each tab and slipping it through the adhesive to break the seal. Before the flashing is pressed down to the surface of the roof you want to apply a bead of silicon on the shingles about an inch in from the edges. Re roofing around an existing service head.