Installing Flashing On A Roof Valley

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Installing flashing on a roof valley.

Recommended procedures of basic valley flashing installation. The flashing shall be a minimum of 4 inches 102 mm high and 4 inches 102 mm wide. Fold the top of the flashing over the ridge. Make sure to cover the gap at the bottom of the raised ridge.

Before you apply the flashing you ll need to lay down a waterproof membrane. Others start with a 3 inch wide. Flashing is generally installed at any joints or edges in the roof where water could otherwise work its way in. Install an underlayment centered in the roof valley.

Now nail this first flashing at both its far ends. 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. In order to properly install new flashing you ll have to remove the shingles surrounding your old flashing and then re lay them after installation. Remember to caulk the underside of the flashing with a sealant.

Cut the bottom edge and fold it down over the drip edge. 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. While roofing professionals occasionally use nails when flashing they must choose whether to nail to the roof plane or the vertical wall. How to do it determine cuts.

Many roofers cut the shingles across because they say it s safer. Step 6 install the flashing. Apply an approximately 3 inch. Some roofers cut the shingles parallel to the flashing s center ridge.

Details concrete masonry roofing wrb flashing. No one of this affirmat. Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch.

Install the underlayment as directed by the manufacturer then set the valley flashing on top of it. One common method is to lay the edge metal under the eaves membrane and over the rake. In this video i show you how i do the valleys on a shingle roof. For the valley areas of the roof you will be using valley flashing.

Especially if you live in an area that gets a lot of snow and ice. Place a piece of sheet metal under the shingles to make sure you will not damage the flashing. Typically flashing is installed using roofing nails and roofing cement.