Flashing On Roof Valleys

Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

Flashing on roof valleys.

Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present. Valley flashing valleys are the places where two roof decks slope toward one another creating a low line that looks like a valley between two mountains. Attach the flashing panel in place at the bottom. Water flows into the valleys on your roof the same way rivers wind through mountain valleys.

Remember to caulk the underside of the flashing with a sealant. This material is available with a v or w shaped profile and is placed over the top of the building felt before the roof s finishing material is installed. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch. Step flashing protects the joints between the roof deck and chimneys or dormers.

Use 1 inch galvanized roofing nails. To secure the roof valley flashing nail it down carefully. Fold the top of the flashing over the ridge. Some roofers cut the shingles parallel to the flashing s center ridge.

How to do it determine cuts. Others start with a 3 inch wide. Then starting at the base of the. Val ley flashing protects the valleys where two roof planes meet.

Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Lay the flashing down in the roof valley and start at the lower end of the roof. Now nail this first flashing at both its far ends. Install an underlayment centered in the roof valley.

Only nail at the edges with only enough nails to. Ensure ice and water protector has been installed along the valley first. Apply an approximately 3 inch. Snipping off the corners of.

Valleys as you d imagine are a prime target for water penetration. Make sure to cover the gap at the bottom of the raised ridge. Place a piece of sheet metal under the shingles to make sure you will not damage the flashing. Cut the bottom edge and fold it down over the drip edge.