As you gather estimates for your upcoming roof replacement project, many items should appear similar from quote to quote (laminate shingles, replace vents, install ice shield, etc…) However, one item in particular has caused debate for years. Which valley technique should I go with? One reputable company says closed cut valleys are best. Another reputable company claims open metal valleys perform better. With valley sections often being the most vulnerable area on your roof and the most likely area to fail, this can be confusing and frustrating for homeowners. This article will attempt to offer insight into the pros and cons of both systems and hopefully help you make a confident choice.
Closed Cut Valleys
Closed cut valleys start with a row of ice shield installed through the center to serve as a water proof liner. The “gasket” effect of the ice shield sealing around any and all nail holes that puncture the membrane is effectively the last line of defence in your valley. This liner is very important for maintaining a trouble free valley. Shingles are then installed on the lower slope (or the slope with the lowest water volume rate). These shingles will overlap the valley. Next, shingles are installed on the higher slope through the valley center. Finally, the shingles on the higher slope are cut by following a chalk line 2” off center.
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