Flashing A Metal Roof Valley
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 a metal roof valley. How to flash a metal roof. Use 1 inch galvanized roofing nails. 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. One common method is to lay the edge metal under the eaves membrane and over the rake.
Details concrete masonry roofing wrb flashing. Recommended procedures of basic valley flashing installation. Make sure to cover the gap at the bottom of the raised ridge. Make metal roof valley clips cleats get some of the flashing material that matches your valley flashing in metal and thickness cut some strips the dimensions are not critical maybe 3 4 to 1 1 2 wide x roughly 5 6 long bend one end of each strip over roughly 3 4 to 1 but do not hammer it.
Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing. Install an underlayment centered in the roof valley. Cut the bottom edge and fold it down over the drip edge. Slip a piece of sheet metal flashing under the top layer of shingles to protect the bottom layer in the valley while you cut the shingles with a hook blade.
Remember to caulk the underside of the flashing with a sealant. Make sure that the end of the flashing panel is perfectly in line with the edge of the roof. Apply an approximately 3 inch. For example in metal roofing systems valleys are commonly fabricated with hems but can also be fabricated without them in which case they could still be used for metal roofing or any other type of roofing.
Two ways to flash roof edges. Valley flashings are custom fabricated to any measurements and angles and usually measure 10 in length but can also be bent in 12 lengths. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch. 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. Fold the top of the flashing over the ridge. Metal roof flashing installation. Step 6 install the flashing.