The felt paper is optional and can he left out completely during valley replacement jobs where the old felt has already disintegrated. The felt paper on new construction need not overlap the valley flashing the valley metal can be laid right on top of the felt if it is going to be slated immediately. Once the flashing and slate are installed, the felt will be entirely obsolete as a waterproofing material. It is much more important to avoid nailing anything into the valley (such as felt paper) than it is to have the felt paper overlap the valley metal. Before the metal is installed, a chalk line is struck up the edge of one side of the roof deck on the felt paper to indicate where the edge of the metal valley flashing should be. The metal is then nailed in place, one side at a time, with a nail of compatible metal. The nails are kept to within one inch of the edge of the valley metal.
Valleys don’t need to be creased on a brake, leaving them with a bend line down the center, except in cases where the two tool surfaces are very steep or the valley is very narrow. Otherwise, a creased valley is simply a matter of personal style and creates no advantage in the function of the valley. Instead, the valley metal can be nailed along one edge, then carefully forced into the roof with the pressure of a knee as the other side is nailed by Toronto roofers.
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