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  1. #1
    Jon mackay's Avatar
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    Default Rafters pulling away from ridge board

    What might cause these 2x12x16 rafters to separate from the ridge board?
    I couldn't find any structural issues anywhere.

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  2. #2
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    Default Re: Rafters pulling away from ridge board

    Are you sure there is movement or is it just a sloppy framing job.
    Assuming framing, I would be looking for walls out of plumb, specifically pushing out at the top from rafter thrust.
    Was there any rafter tie across the building from one side to the other?

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  3. #3
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    Default Re: Rafters pulling away from ridge board

    Looks like poor framing to me. See it often, cant figure out that speed square!!

    James Bohac

  4. #4
    Jon mackay's Avatar
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    Default Re: Rafters pulling away from ridge board

    No collar ties installed.
    Maybe they were just a lot heavier than they were used to working with.


  5. #5
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    Default Re: Rafters pulling away from ridge board

    Looks like collar ties in the picture!

    I agree with the others....sloppy cuts!


  6. #6
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    Default Re: Rafters pulling away from ridge board

    Collar ties were recently added, and even then, not done properly.


  7. #7
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    Default Re: Rafters pulling away from ridge board

    Sloppy cuts agreed and the ridge board is undersized.

    rick


  8. #8
    Jon mackay's Avatar
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    Default Re: Rafters pulling away from ridge board

    Ha ha..
    That's what I get for trying to post from my phone..
    Yes collar ties are in fact there.. Mind like a steel trap..not!

    I will go with non structural. The place was built like a tank with all 2x12 framing from top to bottom and it was only a 3,100 sq ft house.. don't run into that much around here...

    Thank you again for all the great info..


  9. #9
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by Rick Hurst View Post
    Sloppy cuts agreed and the ridge board is undersized.

    rick
    RH: Actually, a ridge board is not even required in this instance. The one they have appears to be nominal 1" material which is code compliant.


    R802.3 Framing details.
    Rafters shall be framed to ridge board
    or to each other with a gusset plate as a tie. Ridge board shall be
    at least 1-inch (25 mm) nominal thickness and not less in depth
    than the cut end of the rafter.At all valleys and hips there shall be
    a valley or hip rafter not less than 2-inch (51 mm) nominal thickness
    and not less in depth than the cut end of the rafter. Hip and
    valley rafters shall be supported at the ridge by a brace to a bearing
    partition or be designed to carry and distribute the specific
    load at that point. Where the roof pitch is less than three units
    vertical in 12 units horizontal (25-percent slope), structural
    members that support rafters and ceiling joists, such as ridge
    beams, hips and valleys, shall be designed as beams.

    Traditional practice is to provide a ridgeboard between
    opposite rafters as a nailing base and to provide a full
    bearing for the rafter. Rafters must be placed directly
    opposite each other, and the ridgeboard must have a
    depth equal to the end of the rafter as illustrated in
    Commentary Figure R802.3(1). Commentary Figure
    R802.3(2) shows an option for framing opposing rafters

    using a gusset plate.



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  10. #10
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    Default Re: Rafters pulling away from ridge board

    What Rick was refering to was that the ridge board is not the full depth of the rafter, which is required by code.

    Last edited by Wayne Carlisle; 02-10-2010 at 07:26 AM. Reason: Said Rich instead of Rick

  11. #11
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by Wayne Carlisle View Post
    What Rick was refering to was that the ridge board is not the full depth of the rafter, which is required by code.
    WC: Yes, and my point is that the ridge board is not required. In fact, I believe, from viewing the photo, that the "carpenter" cut the rafters without allowing for the thickness of the ridgeboard, hence the bad fit.


  12. #12
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    Default Re: Rafters pulling away from ridge board

    AD yep! You are correct. A ridge board is not required however when a ridge board is installed then it must be full depth of the rafters.

    The reason I commented on this was because I took it that you meant that it was okay that the ridge board was undersized because the code doesn't require one.

    Looks like he cut the rafters with a chain saw to me!


  13. #13
    A.D. Miller's Avatar
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    Default Re: Rafters pulling away from ridge board

    Looks like he cut the rafters with a chain saw to me!
    WC: Yessir, while standing on one foot with a Coors in the other hand.


  14. #14
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    Default Re: Rafters pulling away from ridge board

    Those collar ties are practically useless being installed so close to the ridge.


  15. #15
    A.D. Miller's Avatar
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    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by Nick Ostrowski View Post
    Those collar ties are practically useless being installed so close to the ridge.
    NO: I think they installed them to support the electrical cable.


  16. #16
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    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by Nick Ostrowski View Post
    Those collar ties are practically useless being installed so close to the ridge.
    Not useless at all. Collar ties are there to prevent uplift, so their location in the picture is as good as any other location as long as thet are in the upper third of the attic.


  17. #17
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    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by A.D. Miller View Post
    WC: Yes, and my point is that the ridge board is not required. In fact, I believe, from viewing the photo, that the "carpenter" cut the rafters without allowing for the thickness of the ridgeboard, hence the bad fit.
    ad,
    not a carpenter are you? if the above was the case the heel cut would be tight against the ridge and the top of the cut would be open


  18. #18
    A.D. Miller's Avatar
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    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by brian schmitt View Post
    ad,
    not a carpenter are you? if the above was the case the heel cut would be tight against the ridge and the top of the cut would be open
    BS: I was likely a carpenter before you were born.


  19. #19
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by Wayne Carlisle View Post
    Not useless at all. Collar ties are there to prevent uplift, so their location in the picture is as good as any other location as long as thet are in the upper third of the attic.
    WC: R802.3.1
    Collar ties or ridge straps to resist wind uplift shall be connected
    in the upper third of the attic space in accordance with
    Table R602.3(1).




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  20. #20
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    Default Re: Rafters pulling away from ridge board

    I wasn't looking at the collar ties from a wind uplift standpoint. I was thinking about their ability to keep the rafters from spreading (ie - the rafter ties in the pic Aaron provided).

    Well, I learned something new today.


  21. #21
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    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by A.D. Miller View Post
    BS: I was likely a carpenter before you were born.
    ad,
    i doubt it! i was pushing a broom for my dad's construction company in the fifties!


  22. #22
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by brian schmitt View Post
    ad,
    i doubt it! i was pushing a broom for my dad's construction company in the fifties!
    BS: Then as an oldtimer, you should have already learned to respect other carpenters. Or are you still pushing that broom?

    Last edited by A.D. Miller; 02-10-2010 at 10:19 AM.

  23. #23
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    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by A.D. Miller View Post
    BS: Then as an oldtimer, you should have already learned to respect other carpenters. Or are you still pushing that broom?
    ad,
    see post # 17 i have the greatest respect for those who work with tools and their hands for a living. i still do on occcasion when the body allows it. i have never been too arrogant to not push a broom, it comes with the territory. still use your fisher-price big boy tool set?


  24. #24
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Rafters pulling away from ridge board

    still use your fisher-price big boy tool set?
    BS: Yes, in fact, I use it to fix little tin carts like you.


  25. #25
    Ted Menelly's Avatar
    Ted Menelly Guest

    Default Re: Rafters pulling away from ridge board

    Bunch of old farts!!!!!!!!!!!!!!!!!!!!!


  26. #26
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by Ted Menelly View Post
    Bunch of old farts!!!!!!!!!!!!!!!!!!!!!
    TM: Easy there TM, you're no longer a spring chicken yourself . . .


  27. #27
    Ted Menelly's Avatar
    Ted Menelly Guest

    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by A.D. Miller View Post
    TM: Easy there TM, you're no longer a spring chicken yourself . . .
    I am an older fart not an old fart like you folks. You have about 3 years on me. When I get that old then I will be an old fart. Might need a walker by then as well and will have to hire some 30 old beautiful young woman to help me up the stairs ond on the roofs and..................................Well, maybe not 30


  28. #28
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Rafters pulling away from ridge board

    Might need a walker by then
    TM: I hear that Johnny is a good walker. Black or red.


  29. #29
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    Default Re: Rafters pulling away from ridge board

    ad,
    blue


  30. #30
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    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by brian schmitt View Post
    ad,
    not a carpenter are you? if the above was the case the heel cut would be tight against the ridge and the top of the cut would be open
    I was wondering if anyone else would pick up on that...if the ridge wasn't allowed for that the cut would be open on the top that is.

    Randy Gordon, construction
    Michigan Building Inspector/Plan Reviewer

  31. #31
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    Default Re: Rafters pulling away from ridge board

    Quote Originally Posted by Jon mackay View Post
    What might cause these 2x12x16 rafters to separate from the ridge board?
    I couldn't find any structural issues anywhere.
    It looks like it is just plain sloppy work


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