How To Seal A Metal Roof Valley

Install synthetic roofing.

How to seal a metal roof valley.

Using 3 layers of thermal tec s mr multi ply roof system where most of the movement occurs will provide a watertight seal in these areas. Open valleys have the flashing exposed and the shingles end at the flashing edges. Check that the roofing material is cut in a straight smooth line on each side. I have my valley custom made with water trough to help with leaking b.

How to seal metal roof valley. Sealing metal roof valleys watertight fix valleys where two rooflines meet are typical problem areas on metal roofs. Best practices for sealing the metal roof valley vary based on the slope of the roof. Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant.

First clean the debris out of the valley including sawdust nails and whatever else is in there. Metal flashing allow water to flow down the valley. With a clean valley you can lay down some peel and stick roofing membrane. Metal to metal connections are difficult to keep watertight long term.

Missing ice water shield. Fold the top over the roof ridge and cut the bottom along the drip edge metal. The top joinery of both valleys when they meet on the same plane of roof is shown here. A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water.

To seal make sure there is no debris in the valley. Nail each shingle and cover the head with roofing cement. If the ice and water shield is missing then you will have to remove the shingles on both sides along the valley put ice and water shield in place and re shingle the roof.