Results 1 to 14 of 14
  1. #1
    Jerome W. Young's Avatar
    Jerome W. Young Guest

    Default shinglke valley weave

    The valley shingles came together about 6-8 inches from the center of the valley flashing. The shingles wer enot sealed down at all. Never seen this before. Looks like poor workmanship to me. Any particular problems with the seam being out of center and not sealed?

    Similar Threads:
    ***IMPORTANT*** You Need To Register To View Images ***IMPORTANT*** You Need To Register To View Images
    Crawl Space Creeper

  2. #2
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,747

    Default Re: shinglke valley weave

    " Any particular problems with the seam being out of center and not sealed?"
    By sealed, if you mean a contunious bead of roofing cement along the edge, then no, it should not be sealed. Sometimes people can cause a roof to leak by sealing the shingles down. Water needs a way to drain out, sealing along the edges has the effect of sealing the water in.
    But there are problems with the installation;
    The slots on the tabs should not line up.
    The bottom layer of shingles should go past the valley 18" and the upper layer of shingles should be cut back from the valley 4"
    or
    Have an open valley using the "W" style valley flashing, and the shingles cut back from the center of the valley.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  3. #3
    Join Date
    Feb 2008
    Location
    Chicago IL
    Posts
    2,048

    Default Re: shinglke valley weave

    As shown in the picture, if there is already leaves and dirt getting under the shingles, then water is also getting underneath.
    It's hard for me to really tell from that close up picture what the valley really looks like.
    What is the 'white' stuff underneath? Is it an alu full length valley flashing or just some tyvek?

    www.aic-chicago.com
    773/844-4AIC
    "The Code is not a ceiling to reach but a floor to work up from"

  4. #4
    Jerome W. Young's Avatar
    Jerome W. Young Guest

    Default Re: shingle valley weave

    it is valley metal.

    what do you mean cut back 4" rick?


  5. #5
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: shingle valley weave

    Jerome,

    Here is an Owens Corning installation instruction, go to section 3 on page 6 of 7.

    http://www.owenscorning.com/around/r...dHPInstall.pdf

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    www.AskCodeMan.com

  6. #6
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    2,797

    Default Re: shinglke valley weave

    A version of Jerry's reference, formatted for reports:

    ***IMPORTANT*** You Need To Register To View Images ***IMPORTANT*** You Need To Register To View Images
    Michael Thomas
    Paragon Property Services Inc., Chicago IL
    http://paragoninspects.com

  7. #7
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: shingle valley weave

    No comments on the drawing I referred to and Michael formatted for reports?

    I expected an almost immediate response to it.

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    www.AskCodeMan.com

  8. #8
    Steve Lowery's Avatar
    Steve Lowery Guest

    Default Re: shinglke valley weave

    Do you s'pose they meant 30# felt in the valleys instead of 50#? Ive never seen it. Also it specified 2" up the valley not 4".


  9. #9
    Steve Lowery's Avatar
    Steve Lowery Guest

    Default Re: shinglke valley weave

    Hey, Jerry, how sore are you today???


  10. #10
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: shingle valley weave

    Quote Originally Posted by Steve Lowery View Post
    Hey, Jerry, how sore are you today???
    Steve,

    Not too bad, my right wrist was bothering me the most (otherwise this older body bounced pretty dang well ), but today I have full range of movement in my wrist without it hurting much at all - a good indication that all I did was sprain it.

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    www.AskCodeMan.com

  11. #11
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: shingle valley weave

    Quote Originally Posted by Steve Lowery View Post
    Do you s'pose they meant 30# felt in the valleys instead of 50#? Ive never seen it. Also it specified 2" up the valley not 4".
    I've always seen 2", not 4", but that shows the lesser roof is cut back 2" versus what I've always read and seen previously, the greater roof is cut back 2" on everything else.

    I'm curious to know if this is a mistake, or are the others a mistake, or, have the roofing industry changed the way they are doing it?

    I can understand why the greater roof is cut back 2", it has more water, possibly even flowing at a faster rate, and it will meet the water from the lesser roof more than halfway past the center of the valley. The water from the greater roof will flow down over the cut back edge and the water from the lesser roof will not flow over to and under the cut back edge.

    That way that drawing shows it is the water from the greater roof will overflow the center of the valley (I understand that) and then possibly up and over cut back edge, with that water, along with the water from the lesser roof, going in under the cut back edge.

    Makes no sense to me.

    Or am I just looking at the drawing wrong?

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    www.AskCodeMan.com

  12. #12
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,747

    Default Re: shinglke valley weave

    My error, I remembered it being 4". If Owens-Corning says 2", then 2" it is.
    Thanks for the correction.

    Jerry
    Not trying to scare you or cause you undue concern.
    My father in law had a relatively minor accident. A few weeks later he had a swollen leg. Turned out to be a clot in the leg.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  13. #13
    Join Date
    Mar 2007
    Location
    Fuquay Varina, NC
    Posts
    1,074

    Default Re: shinglke valley weave

    Jerry,
    The greater pitched roof always gets cut unless It is smaller area then the lower section where more volume of water will hit the valley. Typically what ever section creates the most amount of water should be cut back.

    Always should seal a cut valley for the reasons in that picture. I'm surprised it doesn't leak.

    Mike Schulz License 393
    Affordable Home Inspections
    www.houseinspections.com

  14. #14
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: shingle valley weave

    Quote Originally Posted by Mike Schulz View Post
    Jerry,
    The greater pitched roof always gets cut unless It is smaller area then the lower section where more volume of water will hit the valley. Typically what ever section creates the most amount of water should be cut back.

    That's what I've always learned too, but that drawing is from the manufacturer, and it shows just the opposite.

    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    www.AskCodeMan.com

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •