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  1. #1
    Jon mackay's Avatar
    Jon mackay Guest

    Default Curl at architectural shingles

    This roof appears to be a 2 layer job 20 or so years old.

    Has anyone seen this curling at the bottom portion of all the shingles before and does the condition have a name? Cupping?

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  2. #2
    Join Date
    May 2009
    Location
    Mn
    Posts
    28

    Default Re: Curl at architectural shingles

    From the photo it appears that the 2nd layer was not nested ( butted against 1st layer). This caused the lifted lower edges of the shingles as the shingles will not lat flat. This makes them very suceptible to the damage as shown and shortens the life of the roof. The "scuffing " was probably caused from foot traffic. It appears to be a glass mat but I can not be sure from photo.
    A comment "The lack of nesting as shown in the manufacturers installation instructions ,ARMA and NRCA appears to be leading to a pre mature roof failure. Suggest having the roof checked out by a Lisc contractor. Monitor and repair / replace as needed."
    Remember the IRC no longer allows any overlays on shingles.


  3. #3

    Default Re: Curl at architectural shingles

    The shingles were bridged instead of nested-- not ideal in my opinion. See here: http://www.asphaltroofing.org/pdf/tb_203.pdf

    Remember the IRC no longer allows any overlays on shingles.
    Which version is that from? 2006 IRC still allows it--- Check out R907 "reroofing"


  4. #4
    Join Date
    May 2009
    Location
    Mn
    Posts
    28

    Default Re: Curl at architectural shingles

    Slight mistake in source . Minnesota when adopted 2006 stated no overlays allowed.
    many local cities as well as most states (mainly in snow belt) do not allow any overlays. They used to allow up to 2 overlays = 3 total layers.

    Check City and State where you live or inspect.

    Last edited by Mike Moser; 04-12-2010 at 03:45 PM. Reason: double word

  5. #5

    Default Re: Curl at architectural shingles

    Slight mistake in source . Minnesota when adopted 2006 stated no overlays allowed.
    I figured that to be the case. That, or I figured it was wishful thinking. Oregon still allows 3 total layers, and the number of defects builds with the number of layers installed.


  6. #6
    Join Date
    Jun 2008
    Location
    Stacy, MN
    Posts
    145

    Default Re: Curl at architectural shingles

    Quote Originally Posted by Mike Moser View Post
    Slight mistake in source . Minnesota when adopted 2006 stated no overlays allowed.
    many local cities as well as most states (mainly in snow belt) do not allow any overlays. They used to allow up to 2 overlays = 3 total layers.

    Check City and State where you live or inspect.
    The whole state of Minnesota is not effected, only those counties that are shown in figure 903.5 cannot have an overlay. Figure 903.5 is what changed between the 2000 & 2006 IRC's (2003 was skipped). In Minnesota local cities cannot amend the State Building Code.


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