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Question DetailsAsked on 4/14/2012

Can archit. shingles put on a hip roof be interwoven in valleys of the roof or must they be cut and is a type of flashing req. in valleys?

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The answer is that "it depends". There are numerous shingle manufacturers and each one has their own specification. The best thing to do is check with the manufacturer you intend to have installed.

We are a ZCertainTeed certified roofing contractor and according to CertainTeed:

"With the exception of Landmark TL, closed-cut valleys are preferred by CertainTeed when applying these shingles. Open valleys are recommended when applying Landmark TL; however closed-cut valleys are also acceptable. Woven valleys are not recommended for Landmark TL because the tri-laminated shingle can buckle and become damaged when shaped into the valley."

The installation instructions doesn't say NOT to weave your vallyes, but it is definetly frowned upon.

Open metal vallyes are over kill in most cases with standard architectural shingles. However with the thicker tri-laminate and luxury shingles, an open vallye is usually a must.

In my area, Chicago, I recommend that ice shield first be installed in the valley. A 3' strip, so 18" on either side of the valley. This is not code for my area, but is good roofing practice. Yes it costs more, but it's an investment, not an expense. Furthermore it might not be necessary in your area because you may not have snow to worry about but it's still a good idea as massive ammounts of water can run through the valley too.


Answered 8 years ago by ReliableAmericanRoof


Architectural shingles SHOULD NEVER be woven in a valley. Either Cut valley or Open valley with W metal.

It is clearly written in All manufacturer's installation instructions

Answered 8 years ago by Onlythebestbuilder

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