How To Metal Valley Into Existing Roof Line

The valley rafter is marked for a 12 in 17 pitch and then cut with a double bevel to fit into the ridge intersection.

How to metal valley into existing roof line. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Re lay the shingles you removed from the existing roof. Connect a flat roof to a sloped or pitched roof with a ledger board. Because most framing lumber is not perfectly straight i check each piece and mark the crown before i start cutting the lumber into rafters.

Lift the underlayment out of the way and then lay a 3 ft wide roll of waterproof shingle underlayment in the valley. Shingle the addition roof letting the new shingles fold through the valley center and onto the old roof deck by at least 1 ft. Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof. Low slope roofs slope less than 3 12 use tape sealant between the valley trim and the panel.

Keeping all of the crowns pointing up prevents waves from marring the finished roof. Install an underlayment centered in the roof valley. Soup to nuts riley shows the proper way of installing a valley on a roof. Soup to nuts riley shows the proper way of installing a valley on a roof.