How To Metal Valley Into Existing Roof Line

Re lay the shingles you removed from the existing roof.

How to metal valley into existing roof line.

Keeping all of the crowns pointing up prevents waves from marring the finished roof. 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. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Lift the underlayment out of the way and then lay a 3 ft wide roll of waterproof shingle underlayment in the valley.

Soup to nuts riley shows the proper way of installing a valley on a roof. Install an underlayment centered in the roof valley. Low slope roofs slope less than 3 12 use tape sealant between the valley trim and the panel. Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof.

Shingle the addition roof letting the new shingles fold through the valley center and onto the old roof deck by at least 1 ft. The valley rafter is marked for a 12 in 17 pitch and then cut with a double bevel to fit into the ridge intersection. Connect a flat roof to a sloped or pitched roof with a ledger board. Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant.