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  1. #1
    Join Date
    Nov 2021
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    Default F5 instead of MGP10 in engineering plan

    Hello Experts,

    My builder has used F5 timber instead of MGP10 which was on the engineering plan. When this was picked up during a private inspection. The builders have not notified us of anything in writing along with the unchanged engineering plans. Is this legal for them to swap the timber as per their wish without the engineering approval? I've been advised on a different platform that it is probably ok to swap F5 to MGP10 but not the other way round. Frame stage is now complete with roof tiles on and bricks ready to go soon and I am super concerned not knowing the basics around it. Timber schedule from engineering attached for reference.

    Greatly appreciate some adviseTimberSchedule1.JPG

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  3. #2
    Join Date
    Jun 2013
    Location
    Geelong
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    Default

    If you don’t get any bites here, try the renovators forum.
    Your ultimate guide to decoding timber ratings | Narangba Timbers

    don’t know if that helps or hinders it is QLD.
    my quick googling didn’t come up with a definitive yes/no.
    your engineering plans will have the name of the engineer you could maybe ring and ask?
    cheers

  4. #3
    Join Date
    Apr 2018
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    Nsw
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    Default

    What others tell you is really of no significance. Ask the designing engineer or get your builder to do so

  5. #4
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    Nov 2021
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    Default

    Thank you wrongwayfirst. Great idea, will check if the plan has engineer's name

  6. #5
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    Default

    Thank you wrongwayfirst and Beardy. Great idea, will check if the plan has engineer's name. Asked the builder today to give me the engineers contact. Fingers crossed, he would be ok with that

  7. #6
    Join Date
    Aug 2008
    Location
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    6,041

    Default

    You got your answers here already View topic - F5 instead of MGP10 Home Renovation & Building Forum specifically this one:
    The certified engineering details are for MGP10 ( a higher stress grade timber) , the builder will have to go back to their engineers to recertify the engineering for F5
    Their Building surveyor is talking nonsense as they aren't licenced to change the original engineering Details without resubmitting new engineering
    The ONLY person who can pass any deviations from spec is the Design Authority, that being the engineer who signed off on the original drawings. End of story. Your builder has to either get it reapproved by the engineer or make the appropriate changes (which will also have to be specified by the engineer) to bring it back up to an acceptable standard.

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