Metal valley

Metal valley

A V-shaped valley or gutter between two roof slopes, lined with pieces of lead, zinc, copper, or sheet metal to prevent the leaking of water.

metal valley

A velley gutter lined with metal.
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If this self-stick ice-and-water underlayment bridges both sides of the decking, leaving a gap underneath, it could tear once you install the metal valley flashing.
In general, cover the eaves and valley with strips of waterproof membrane (Photo 13) and install the sheet metal valley. Place roofing nails about 12 in.
Then install a preformed galvanized metal valley (or use other methods approved by your building inspector).