Need Help with your Roof Repair? Hire the Best Roofing Companies. Asphalt Roofing Residential Manual. Recommended procedures of basic valley flashing installation: Install an underlayment centered in the roof valley.
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. Take care not to place any fasteners in the exposed center area of the metal flashing. Snipping off the corners of adjacent shingles roofers call it dubbing adds a measure of protection against water being channeled under shingles. Lift up shingles and use a hook blade to cut all the pointed unexposed ends.
Make each cut about 2 inches from the point. Caulk twice between shingles and flashing. Using roofing cement in a caulk tube, insert the tube's tip all the way under the shingles and run a continuous bead. Then hold the nozzle 2 inches back and apply a second bead nearer the edge.
Lift up each top shingle and apply roofing cement to adhere the shingles to each other. This is important both to seal out water and to attach the shingles because there are no nails. Some roofers prefer to apply roofing cement to the flashing using a trowel rather than a caulking gun before they install the shingles. You can also apply cement between the shingles as you go using a trowel or a caulking gun.
Be aware, however, that this method can get messy. Roof one side of the valley, running the shingles across it. Stop nailing 6 inches from the center. Lay one- and two-tab shingles as you near the valley so full-size shingles will run across the valley. Shingle the other side of the valley the same way. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Cut the top layer of shingles along the chalkline. 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.
Dub-cut the top-layer shingles see Step 4 in Open Metal Valley above. Apply two beads of roofing cement to attach the top-layer shingles to the bottom-layer shingles. Also apply cement to attach the top-layer shingles to each other see Steps 5 and 6 in Open Metal Valley above. The two sides of the valley must be shingled at the same time: Shingle a course on one side, then the other.
Attach the subsequent courses. Continue working on alternate sides to weave shingles across the valley. To learn more about roofing, please visit our Roofing section. To find a local roofer in your area, please visit our Contractor Locator page. All rights reserved. The information on this website is subject to change without notice. IKO assumes no responsibility for errors that may appear on this website. IKO strives to accurately reproduce the screen images of the shingle swatches and house photos shown.
However, due to manufacturing variances, the limitations of your monitor resolution and the variation in natural exterior lighting, actual colors may vary from the images you see. To ensure complete satisfaction you should make final color selections from several full size shingles and view a sample of the product installed on a home.
Please refer to our Legal Notices for U. Location set to view all. Show All Products. Woven Valley Shingle Installation To achieve a woven valley installation, a roofing professional lays shingles in the valley and weaves them together. Closed-Cut Shingle Valley Installation Closed-cut valleys, also called closed valleys, are installed quickly and have a cleaner, sharper look than woven valleys.
Open Valley Shingle Installation An open valley relies on metal flashing for protection. Valley Flashing Options for an Open Valley Installation If you are installing an open valley, you will need to select a flashing material. Possibilities include: Copper may be cold-rolled or high yield. Steel must be stainless or galvanized. Zinc alloy. Painted terne steel with a lead and tin coating. Then, starting at the base of the valley, center your first piece of flashing in the valley.
Step Two: To secure the roof valley flashing, nail it down carefully. Only nail at the edges, with only enough nails to hold it in place. Extra nails may increase the risk of leaks. Step Three: Moving up the valley, install any additional roof flashing, as required to cover the entire length. Overlap each piece of flashing by at least 6 inches mm. First, apply asphalt plastic cement under the overlap area, then place and nail down the second piece of flashing.
Step Four: Now you need to set out chalk lines to guide you as you install shingles along the valley. Snap two chalk lines parallel to the valley and down its entire length. At the top of the valley, the lines should be 6 inches mm apart.
Then, they should gently slope outward at a quarter inch 3 mm every 12 inches mm , to a maximum of 8 inches mm apart at the base of the valley. As a stream of water moves down a valley, it gets wider; so, the exposed flashing must also get wider. Step Five: Begin to install roof shingles on either roof face. When you reach the valley, lay the shingles over the valley and trim the edges to the chalk line. You can use a straight edge to achieve a straight cut.
Step Six: Nail down each valley shingle at least two inches 50 mm back from the chalk line.
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