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  1. #1
    Join Date
    Mar 2010
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    Ocala Florida
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    92

    Default Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    2000 block home with concrete tile hip roof - trusses have all 2x4 webs and cords with typical sized gussets plates, sheathing is 3/4" OSB, trusses space 24" O.C. - a general remodeling contractor was on site who stated he also thought it was odd and said he has seen many in this sub-division the same. All permits pulled and signed off on. No visible adverse conditions, no truss specs on site or available. Every like home I have been in so far has 2x6 top chords with large gusset plates. Any thoughts on this as to if it is okay? Thanks

    NHIE Practice Exam

  2. #2
    Join Date
    Dec 2008
    Location
    Maryland
    Posts
    2,776

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    It boils down to the design of the trusses and what load they were designed to.


  3. #3
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    26,244

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    A 2x6 top chord allows for longer top chord spans, a 2x6 top chord would require more connections with shorter spans - for the same loads.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  4. #4
    Join Date
    Mar 2010
    Location
    Ocala Florida
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    92

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    Quote Originally Posted by Jerry Peck View Post
    A 2x6 top chord allows for longer top chord spans, a 2x6 top chord would require more connections with shorter spans - for the same loads.
    Gary, Jerry thanks for the replies; I'm assuming you meant 2x4's would require more connections with shorter spans.


  5. #5
    Join Date
    Feb 2009
    Location
    Southern Vancouver Island
    Posts
    4,546

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    - - - Updated - - -

    Mark, they wouldn't have just laid the tiles on the OSB sheathing. Or would they?
    I am thinking there may be 2x4 strapping to help support the weight. But I can't tell from here.

    Somebody in that subdivision has the original house plans.

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

  6. #6
    Join Date
    Mar 2010
    Location
    Ocala Florida
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    92

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    Quote Originally Posted by John Kogel View Post
    - - - Updated - - -

    Mark, they wouldn't have just laid the tiles on the OSB sheathing. Or would they?
    I am thinking there may be 2x4 strapping to help support the weight. But I can't tell from here.

    Somebody in that subdivision has the original house plans.
    Good thought John, I also could not tell from reviewing photos on the surface and nothing extra as viewed from the attic. I suspect all is okay because the building department inspectors are pretty good in this area; all inspections passed, CO issued and no visible adverse conditions. I explained all this to customers and to check further as a precautionary measure. Thanks to all for replies.


  7. #7
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,244

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    Quote Originally Posted by mark petty View Post
    I'm assuming you meant 2x4's would require more connections with shorter spans.
    Oops!

    Yes, 2x4 is what I meant.

    Typing on my phone in NC.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  8. #8
    Join Date
    May 2010
    Location
    St. George, UT
    Posts
    217

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    Most all of the newer homes here are tile and many are with 2x4 top and bottom cords as well as the webbing. These days without the proper knowledge and a computer program I don't think you would want to guess what the load rating is going to be. One extra cross member (webbing) and or gusset nail plate of a certain size will change the loading allowance. I've also seen top cords with a combination of 2x4 and 2x6 all within the Same Truss. Location of bearing walls can also show a change in the trusses make up.

    I know a few guys here that run truss shops and they have said most of the engineered trusses in our area (St. George, UT) would handle tile since the trusses are required and designed to support up to 3 layers of composite shingles. But our Snow Load requirements are not the same as say SLC.

    I have had some people ask me if the trusses will handle tile, if they were to re-roof. I always tell them that is above my pay grade the only way to know is to have a truss guy come out and take the measurements needed. They run it through the computer and it says yea or nay.


  9. #9
    Join Date
    Mar 2010
    Location
    Ocala Florida
    Posts
    92

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    Quote Originally Posted by Larry Morrison View Post
    Most all of the newer homes here are tile and many are with 2x4 top and bottom cords as well as the webbing. These days without the proper knowledge and a computer program I don't think you would want to guess what the load rating is going to be. One extra cross member (webbing) and or gusset nail plate of a certain size will change the loading allowance. I've also seen top cords with a combination of 2x4 and 2x6 all within the Same Truss. Location of bearing walls can also show a change in the trusses make up.

    I know a few guys here that run truss shops and they have said most of the engineered trusses in our area (St. George, UT) would handle tile since the trusses are required and designed to support up to 3 layers of composite shingles. But our Snow Load requirements are not the same as say SLC.

    I have had some people ask me if the trusses will handle tile, if they were to re-roof. I always tell them that is above my pay grade the only way to know is to have a truss guy come out and take the measurements needed. They run it through the computer and it says yea or nay.
    Larry, good info for future reference, thanks


  10. #10
    Join Date
    Mar 2007
    Location
    Vancouver - Canada
    Posts
    221

    Default Re: Traditional trusses with 2x4 webs and cords on home with concrete tile roof

    In the past I'd only see 2x6 trusses with tile roofs but in the past few years I'm also seeing 2x4 trusses on occasion. When I called the tile manufacturer to inquire if 2x4 was ok, I was told they no longer give opinion on truss size due to some of the lighter weight concrete tiles available.

    Since this was a new home, with similar homes going up in the same block (with 2x6 trusses) I recommended buyers agent ask to see the stamped approved drawings showing 2x4 trusses with this roof covering, which the builder was not willing to provide... buyer walked.

    Joe Klampfer RHI
    www.myinspection.ca
    Pacific Home Inspections

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