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Combinations roof window install (Fakro)

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  • 03-08-2022 5:43pm
    #1
    tonydude
    Registered Users Posts: 1,672 ✭✭✭


    Hi , looking for some structural advice for the install of a double combination roof window.

    I'm mostly focused on the vertical upright post that's going to take the weight of the double rafter coming down between the 2 windows. Whats the best way to do this. It's block built with a 200mm cavity and I've currently just joisted it. The post can be no bigger than 100mm wide to accommodate flashings. I've added a pic of a different job,where the inner leaf is studded out.

    My thoughts are shutter where the post should be located and bed an galvanized T anchor into get, letting it about 300mm proud. Then sandwich two 6x2s around it.


    Any thoughts would be appreciated 👍


    IMG-20220803-WA0002.jpg




Comments

  • Options
    #2
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,700 Mod ✭✭✭✭DOCARCH


    Mod Note: Just to note the forum charter - Section 1.5

    Structural items . Issues relating to the specification of structural components is prohibited. Any queries in this regard need to be dealt with by an architect/engineer privately.

    Best to consult a structural engineer with your query.



  • Options
    #3
    C. Eastwood
    Registered Users Posts: 757 ✭✭✭C. Eastwood


    https://www.boards.ie/discussion/2058257318/combinations-roof-window-install-fakro

    You could also consult a Chartered Building Surveyor or Registered Builder Surveyor or a Chartered Civil Engineer



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    #4
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,700 Mod ✭✭✭✭DOCARCH


    https://www.boards.ie/discussion/comment/119425741#Comment_119425741

    Sorry, but that's like going to the doctor with a toothache!

    A building surveyor certainly may be able to advise, but it's a structural engineer that's required (to calculate, detail and specify).



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    #5
    C. Eastwood
    Registered Users Posts: 757 ✭✭✭C. Eastwood


    https://www.boards.ie/discussion/comment/119426511#Comment_119426511

    What an insult to Chartered Civil Engineers.



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    #6
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,700 Mod ✭✭✭✭DOCARCH


    Good to know it's not an insult to building surveyors! 😀

    A structural engineer is the required professional.



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  • Options
    #7
    C. Eastwood
    Registered Users Posts: 757 ✭✭✭C. Eastwood


    A second year Civil Engineering student could design the supports for the 3 roof windows above.



  • Options
    #8
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,700 Mod ✭✭✭✭DOCARCH


    https://www.boards.ie/discussion/comment/119426631#Comment_119426631

    I have no doubt they could but could they sign off on it, provide an opinion on compliance and have the PI insurance to back it up?



  • Options
    #9
    Stone Deaf 4evr
    Registered Users Posts: 7,991 ✭✭✭Stone Deaf 4evr


    https://www.boards.ie/discussion/comment/119426631#Comment_119426631

    indeed and they could in theory, but personally, id rather have someone with some paperwork behind them and real world experience / insurance behind them to do it, rather than some 'have a go' hero.



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    #10
    C. Eastwood
    Registered Users Posts: 757 ✭✭✭C. Eastwood


    A Chartered Civil Engineer with PI Insurance could design and furnish a Certificate of Compliance.

    They are capable of designing the support of the 3 roof windows above after completing 2 year Civil Engineering of a 4 yr Degree.

    It is therefore axiomatic that after they graduate and obtain the CEng title after another minimum 5 years, they would still be capable of designing the support for the 3 roof windows above.



  • Options
    #11
    muffler
    Registered Users Posts: 45,820 ✭✭✭✭muffler


    https://www.boards.ie/discussion/comment/119426711#Comment_119426711

    Let's go back to your claim about a 2nd year engineering student doing the dedign. Can he or she stand over it and inspect and certify as asked by DOCARCH?



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    #12
    muffler
    Registered Users Posts: 45,820 ✭✭✭✭muffler


    https://www.boards.ie/discussion/comment/119426519#Comment_119426519

    You got that spectacularly wrong. Nothing new there I suppose.



  • Options
    #13
    C. Eastwood
    Registered Users Posts: 757 ✭✭✭C. Eastwood


    https://www.boards.ie/discussion/2058257318/combinations-roof-window-install-fakro

    tonydude

    You should retain either a Civil Engineer or a Structural Engineer to design the structural support for the 3 windows in the roof.



  • Options
    #14
    chooseusername
    Registered Users Posts: 3,588 ✭✭✭chooseusername


    https://www.boards.ie/discussion/comment/119431574#Comment_119431574

    You should retain either a Civil Engineer or a Structural Engineer to design the structural support for the 3 windows in the roof.

    If they're going to retain an Engineer why advise them to consult a Surveyor?

    "You could also consult a Chartered Building Surveyor or Registered Builder Surveyor or a Chartered Civil Engineer



  • Options
    #15
    C. Eastwood
    Registered Users Posts: 757 ✭✭✭C. Eastwood


    https://www.boards.ie/discussion/comment/119432145#Comment_119432145

    I am delighted to be able to provide you with more advice

    Some Civil Engineers and some Structural Engineers may decide to act only as Ancillary Certifiers:-

    4.2.2 Ancillary Certifiers

    Apart from the Assigned Certifier and Design Certifier there is likely to be a range of certifiers on most projects, including certifiers appointed by the Building Owner, by his design team and/or by the Builder. 

    Therefore the Building Owner may have retained one of the following as a Design Certifiers and an Assigned Certifier:-

    Chartered Building Surveyor or a Registered Building Surveyor or a Chartered Building Engineer or an Architect.

    The Assigned Certifier could retain an Auxiliary Certifier to design the steel structure.

    It’s what most Building Owners do.



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    #16
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,700 Mod ✭✭✭✭DOCARCH


    https://www.boards.ie/discussion/comment/119433046#Comment_119433046

    🤔😥🤐 Going a bit OT there!!!

    What's Design Certifiers and Assigned Certifiers got to do with it?

    Back to basics, the OP needs to engage a structural engineer.



  • Options
    #17
    C. Eastwood
    Registered Users Posts: 757 ✭✭✭C. Eastwood


    https://www.boards.ie/discussion/comment/119433327#Comment_119433327

    Try and read all of the comments, and try and read each comment fully, when you intend to reply to a comment which answered a previous comment

    chooseusername


    chooseusername

    Registered Users

    Posts: 1,771 ✭✭✭ 05-08-2022 10:30am

    C. Eastwood9:26 am

    https://www.boards.ie/discussion/2058257318/combinations-roof-window-install-fakro

    tonydude 

    You should retain either a Civil Engineer or a Structural Engineer to design the structural support for the 3 windows in the roof.



    You should retain either a Civil Engineer or a Structural Engineer to design the structural support for the 3 windows in the roof.

    If they're going to retain an Engineer why advise them to consult a Surveyor?

    "You could also consult a Chartered Building Surveyor or Registered Builder Surveyor or a Chartered Civil Engineer




  • Options
    #18
    chooseusername
    Registered Users Posts: 3,588 ✭✭✭chooseusername


    https://www.boards.ie/discussion/comment/119433046#Comment_119433046

    Thanks for that advice, it's been filed away.

    In post 13 you said,

    "You should retain either a Civil Engineer or a Structural Engineer to design the structural support for the 3 windows in the roof."

    (No mention of Surveyors here)

    Now, not all Civil Engineers are Structural Engineers, as you know, so the best advice to the OP is to consult a Structural Engineer.

    Funnily enough that was the advice in the very first reply by @DOCARCH, and it should have been all over. ( It is now, for me anyway)



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    #19
    muffler
    Registered Users Posts: 45,820 ✭✭✭✭muffler


    Sometimes people dig themselves so far into a hole that they need a CHARTERED structural engineer to design a bespoke ladder to get them out of it!



  • Options
    #20
    tonydude
    Registered Users Posts: 1,672 ✭✭✭tonydude


    Hi guys, the end result will have a double rafter and a double 9x2 as the post. Steel will be sandwiched in-between. Steel will be fixed into a cast top block and go up the post and follow the pitch of the roof for about 3 feet. 👍



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