Roofing Valley Transition

At the roof transition shown in.

Roofing valley transition.

Valleys are prone to collecting leaves particularly if someone sets up an antenna at the base of the valley. With a clean valley you can lay down some peel and stick roofing membrane. How to seal metal roof valley. Take care not to place any fasteners in the exposed center area of the metal flashing.

If repairs are needed the contractor has to remove and then reweave multiple shingles to replace a single one. 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. Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet. 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.

First clean the debris out of the valley including sawdust nails and whatever else is in there. 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. Fold the top over the roof ridge and cut the bottom along the drip edge metal. The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off.