asphalt shingles on a low pitch full dormer?


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Old 01-03-08, 07:03 AM
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Thumbs down asphalt shingles on a low pitch full dormer?

Would anyone ever consider putting shingles on a low pitch dormer on the back a of a Cape style house? Or woudl yo uprefer the 3-4 ft Roll roofing material to cut down on the amount of seams? Thats what I had before and the roofer used shingles this time around w/ Ice and water sheild beneath (allegedly). Thoughts? Doesnt seem right to me.
 
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Old 01-03-08, 08:02 AM
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Originally Posted by Squid View Post
Would anyone ever consider putting shingles on a low pitch dormer on the back a of a Cape style house? Or would you prefer the 3-4 ft Roll roofing material to cut down on the amount of seams? That's what I had before and the roofer used shingles this time around w/ Ice and water shield beneath (allegedly). Thoughts? Doesn't seem right to me.
How low is "low" in your case?

Between 2/12 and 4/12 CertainTeed (for example) requires a "waterproofing shingle underlayment" (WSU) or its "equivalent" (a material that meets ASTM D1970, or two layers of 36" wide felt shingle underlayment lapped 19"), applied over the entire deck surface", see for example:

http://www.certainteed.com/NR/rdonly...Manual8Ch5.pdf

so what I would do at an inspection is consult the single manufacturer's installations instructions, then determine if the underlayment and other aspects of the installation meets their requirements. Often in my area (Chicago) it will not.

Below 2/12 I'm not aware of any shingle manufacturer that allows a shingle application, and around here the roofers I use on my own projects prefer not to go below 4/12.
 

Last edited by Michael Thomas; 01-03-08 at 08:23 AM.
 

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