Use valley flashing or weave the shingles?


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Old 04-12-03, 11:02 PM
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Use valley flashing or weave the shingles?

Is there any advantage(s) to using valley flashings, vs just weaving the shingles across the valleys? When are valley flashings used?
 
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Old 04-13-03, 10:11 AM
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Hi Dave,

I personally prefer the closed valley method of shingling. I think it looks neater. An open or cut valley system is less likely to leak.

Both methods are depicted on the packages of every shingle manufacturer and a picture is worth a 1000 words.

Many may consider this overkill, but when we do tear-offs, we double up our paper in the valleys of all roofs and often go ahead & put rolled flashing in the valleys of low sloped roofs. We're talking about roofs with a pitch between 2/12 & 4/12.

Hope that helps you out.
 
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Old 04-13-03, 11:08 AM
spolsen
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A valley flashing is a preference among most, having an exposed valley with copper or painted aluminum(24" coil stock). It increases the cost, but results in a more wearable roofing system. It is basically a design preference. Water causes wear because it has friction. So, another reason for metal in the valley would be to stop the valley's from wearing out prematurely. GAF has a product call WeatherWatch to put under a valley. A less expensive way is to use "roll roofiing". Some people with less experience also use this method, because it has less of a chance for leaks. If an experienced roofer is installing this roof, it is all cosmetic and by preference. Hope this helps!!
 
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Old 04-13-03, 05:32 PM
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Sounds like valley flashing is the way to go, if you don't mind the appearance. Thanks!
 
 

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