Roofing Valley Transition

The lower roof unavoidably slows down water drainage and when the valley is clogged a significant amount of water coming down that valley will tend to spread out and back up under the shingles.

Roofing valley transition.

In order to shingle this kind of roof valley a roofing professional has to install both roof faces at the same time which is quite slow. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Valleys are prone to collecting leaves particularly if someone sets up an antenna at the base of the valley. At the roof transition shown in.

First clean the debris out of the valley including sawdust nails and whatever else is in there. Low slope roofs slope less than 3 12 use tape sealant between the valley trim and the panel. Cut the panels from the ground instead of on the roof to avoid damaging the roof with the debris. Best practices for sealing the metal roof valley vary based on the slope of the roof.

If repairs are needed the contractor has to remove and then reweave multiple shingles to replace a single one. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic clip the top corner of shingles along valleys to keep water flow toward center of valley. With a clean valley you can lay down some peel and stick roofing membrane. Take care not to place any fasteners in the exposed center area of the metal flashing.