Now we have the eave trim installed with the continuous cleat, and before we put in our offset cleat we need to install the valley pan. This is what we call a "W" Valley. It has the raised V in the center, the raised W.
Not all valleys do. This raised section is to keep water, snow and ice from rushing down the roof and skipping up onto the other side. It creates a break and makes sure that water, snow and ice gets channeled to the end of the valley.
I'm going to put the valley in place, mark the underside of it and cut it so that it fits nicely where the two eaves join at this inside corner. I'm going to mark the valley and overhang it a little bit. You'll see at the top that I've already cut it to fit the ridge line.
With that done, I'm going to take the valley to the table, make my cuts and come back so we can install it. You can see that the edge of the valley has been cut so that it's in line with the edge of the eave trim.
Between the metal and the valley, we're going to use tape seal to make sure that water can't lip itself underneath and roll back up underneath the valley. We're ready to put the valley pan in place and put a screw through it temporarily, a little higher up so that we can work on putting our offset cleats in. Even so, a high percentage of valley flashings are not installed properly because the roof repair company does know the basics.
Or, these roofers know how to do the job right, but choose to cut corners at your expense. Regardless of the reason, when it is not installed properly the risk of significant interior damage is great. Need Help with your Roof Repair? Hire the Best Roofing Companies. Asphalt Roofing Residential Manual. To achieve a woven valley installation, a roofing professional lays shingles in the valley and weaves them together. Some homeowners prefer the consistent look that a woven valley provides.
But, if the shingles are not laid in the valley properly, a woven valley may not lay flat, creating bumps and detracting from the overall look of the roof. The woven valley shingle installation method does not call for roofing cement, relying instead on the weave pattern to protect from water infiltration.
So, if you are installing a woven valley, you must push the shingles snugly into the valley, while not nailing within six inches of the valley center. If this is not done properly, hollow space may develop under the shingles. The empty space makes the shingles vulnerable to penetration, either by footsteps, hail or other debris. A woven valley shingle installation has other drawbacks, including that they are slow to install, especially in cold weather , and more difficult to repair than the other types.
In order to shingle this kind of roof valley, a roofing professional has to install both roof faces at the same time, which is quite slow. If repairs are needed, the contractor has to remove and then reweave multiple shingles to replace a single one. While a woven valley may save on initial installation costs, because they require less materials, they may cost more in the long term.
Woven valleys are suitable for three-tab shingles as their single-layer construction allows them to be woven together and overlapped more easily. When considering how to shingle a valley with architectural shingles, you must take into account their thickness and reduced flexibility. Laminated shingles are more liable to create bumps in woven valleys. Often, they are too thick to be woven at all. Thus, IKO does not recommend installing a woven valley with laminated shingles. Closed-cut valleys, also called closed valleys, are installed quickly and have a cleaner, sharper look than woven valleys.
From the ground, it looks as though the shingles meet in a clean line in the center of the valley. One layer of shingles actually crosses the valley beneath the other. It is essential to only use whole not cut shingles during this step. As you install roof shingles on the second roof plane, you allow them to lap over the valley on top of the first shingles.
The shingles on the second layer are then cut, ideally creating a clean line down the center of the valley. A chalk line can be used to guide you as you cut the shingles. Unlike a woven valley, a closed valley will not have hollows. However, closed valleys still rely on shingles to protect the valley, which has its drawbacks.
The shingles in the valley may lose their granules, and thus their coloration and protective capability, faster than the rest of the roof. Ultimately, laying any shingle in a valley can restrict proper water and debris flow, unlike the metal flashing used in an open valley.
One variant of the closed-cut valley is the California valley, also called Long Island valley and New Jersey valley. This saves the time of cutting shingles and is the fastest way to shingle a roof valley, but it does not provide adequate protection in most climates.
Indeed, California valleys are prohibited in some areas. Always be sure to refer to your local codes to see if they demand a particular kind of valley installation. An open valley relies on metal flashing for protection. That flashing is left exposed, so the roof has visible lines of metal running down the valley. IKO recommends installing an open valley with architectural or laminated shingles. Jeff Tessaro, a knowledgeable IKO sales representative, explains that open valleys have key advantages, including longevity.
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