Albany Roofers: Article About Roofing Techniques
A roof's valleys are features that help direct the flow of water between the roof's two hips or, alternately, the sloped face and a dormer. Because so much rain and melting ice or snow moves through these areas, they require extra protection from the elements. Insufficient waterproofing and poor workmanship and installation techniques in this area could cause serious problems, including roof leaks and rotting of the sheathing. Careful work performed by experienced Albany roofers helps to ensure that each valley on the rooftop is protected from the weather.
A leak in a roof's valley usually requires that the roofers replace all of the shingles. Sometimes, the roof's wooden sheathing also needs to be replaced if the leaking was undetected for a long period of time. Preventing such leaks is much easier than fixing them after the structure has experienced damage.
The best way to protect a roof's valleys is to install multiple waterproofing materials before the shingles or tiles are placed. Roofers start with a waterproof membrane that is affixed to the decking with construction mastic or an asphalt based adhesive. This is spread across the entire valley and up any adjacent vertical walls.
Next, the roofers place W styled metal flashing across the valley. This material is made of aluminum, galvanized steel or copper.
The roofing experts at Ideal Construction of Albany NY can assist you with any questions regarding siding or roofing.
Its purpose is to protect multiple angled surfaces from the intrusion of water and from the soaking effects of standing water that might accumulate during a heavy rainstorm or when heavy ice and snowfall is melting.
Once the flashing is installed, roofers start laying the shingles or tiles. The shingles are trimmed so that none overlap the deepest part of the valley. A homeowner's attempts to make shingles conform to the shape of the valley will be generally unsuccessful and can result in a leak. The correct technique is to angle the shingles and trim them so that they fit next to the valley's center line rather than into it. The shingles should extend up the vertical wall a bit and be topped off by additional flashing. Alternatively, step flashing can be used to protect nearby vertical walls.
Peel and stick membranes should not be used as a flashing replacement on the roof's valleys. This is because these thin membranes are not meant to handle the water load that flashing is built to deal with. The membranes are also not rated for weather exposure. The sun's ultraviolet rays, heat and wind can all degrade the membrane.