How To Replace Roof Valley Flashing

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.

How to replace roof valley flashing.

Slip a piece of sheet metal flashing under the top layer of shingles to protect the bottom layer in the valley while you cut the shingles with a hook blade. Cut each side of the flashing at the lower end to conform with the corresponding edges of the roof using sheet metal cutters. Position a new vent pipe flashing over the vent push it down into place and nail where shingles will cover it. From drip edge to valley flashing december 25 2018 drip edge metal valley flashing dormer chimney and kick out flashing shed water away from the connections between roofs walls chimneys and other building assemblies.

If this is a repair job the siding must also be removed and replaced with the flashing. Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Architectural shingle installation is especially critical in roof valleys where iko recommends an open valley installation. If the ice and water shield is missing then you will have to remove the shingles on both sides along the valley put ice and water shield in place and re shingle the roof.

Pry and lift off the flashing. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. I have my valley custom made with water trough to help with leaking b. To replace flashing around the vent pipe first remove the shingles covering the flange at the back and sides.

First step flashing must be installed before the siding so that the siding can cover the top of the flashing. Learn the three methods of shingling a roof valley the advantages and disadvantages of each how to choose valley flashing and how to shingle an open valley. A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water. Cut each side at the upper end of the valley to conform with the.

Second step flashing needs to extend 8 to 14 inches above the shingles according to the national roofing contractors association nrca. The top joinery of both valleys when they meet on the same plane of roof is shown here. With a clean valley you can lay down some peel and stick roofing membrane. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

Pull or cut off any nails.