How To Metal Valley Into Existing Roof Line

Connect a flat roof to a sloped or pitched roof with a ledger board.

How to metal valley into existing roof line.

Keeping all of the crowns pointing up prevents waves from marring the finished roof. The valley rafter is marked for a 12 in 17 pitch and then cut with a double bevel to fit into the ridge intersection. Best practices for sealing the metal roof valley vary based on the slope of the roof. Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof.

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Shingle the addition roof letting the new shingles fold through the valley center and onto the old roof deck by at least 1 ft. Low slope roofs slope less than 3 12 use tape sealant between the valley trim and the panel. Because most framing lumber is not perfectly straight i check each piece and mark the crown before i start cutting the lumber into rafters.

Re lay the shingles you removed from the existing roof. Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant. Soup to nuts riley shows the proper way of installing a valley on a roof. Install an underlayment centered in the roof valley.