Roofing Valley Transition

How to seal metal roof valley.

Roofing valley transition.

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. Valleys are prone to collecting leaves particularly if someone sets up an antenna at the base of the valley. Fold the top over the roof ridge and cut the bottom along the drip edge metal. With a clean valley you can lay down some peel and stick roofing membrane.

Cut the panels from the ground instead of on the roof to avoid damaging the roof with the debris. At the roof transition shown in. 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. 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.

If repairs are needed the contractor has to remove and then reweave multiple shingles to replace a single one. 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. First clean the debris out of the valley including sawdust nails and whatever else is in there. Best practices for sealing the metal roof valley vary based on the slope of the roof.