Roof Valley Against Wall

What is an open valley roof.

Roof valley against wall.

In comparison to a closed valley an open valley adds another layer of lining into the valley. A common problem area is the point where a gutter dies into an adjoining wall as the photo below illustrates. The asphalt shingles serve both as the valley lining and as the wear surface to protect against water. A key part of my approach is using a special piece of flashing at this.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic often water runs to openings in the vapor barrier such as at ceiling light fixtures. The exterior of a house presents plenty of opportunity for leaks. Position an extension ladder against the lower edge of the roof near the valley that is repaired.

Stop nailing 6 inches from the center. Proper roof wall abutment flashing examples. Some roof leaks are tough to locate. Remove any debris from the valley by hand or with a utility brush.

Iko recommends that you install architectural shingles with the open valley method for the best roof performance. Unless you re careful step flashing can allow water from the roof to slip behind the gutter and get behind the siding and even the housewrap. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Sometimes the water shows up at a ceiling spot distant from the leak.

While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. This recommendation includes iko s premium shingles. Below are two photographs of roof wall step flashing completed and effective of a slate roof against a brick wall below left and in process with step flashing against a dormer sidewall before the dormer siding has been put in place below right. Here is an attempt though maybe not a very good one to make the roof flashing serve also as a through the wall flashing with a tile roof.

The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. Roof one side of the valley running the shingles across it. Shingle the other side of the valley the same way. The flat roofing material must go up the wall a minimum of 12 or up the wall and over the top of the wall if the wall is less than 12 high.

When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. Open valleys have metal flashing to protect this critical area of the roof.