Support for new loft beams

15 May 2011
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United Kingdom
I am installing new beams in my loft which my structural engineer calculated as 175 by 75. In the plans he did not specify how to support these beams at both sides. Please see diagram. I would prefer to go with PROPOSED B and lay the new beam over the wall plate however to do this I would need to cut the beams due to the angle of the rafters. PROPOSED A using joist hangers would increase my loft height but means a lot of extra work to remove all of the existing ceilings as the new beam would fall below this.
Please can someone clarify whether I can rest on the existing wall plate or whether I will have to install hangers as in PROPOSED B
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You have paid your engineer for this, his remit must include the detail of the support for new joists, not just their size.
I'm assuming this is for a loft conversion, as the sizes of the beams are rather substantial ? If so, you certainly can't go with B as the new beams would be below the height of the existing ceiling rafters (which I doubt can be removed). Your SE will advise.
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Chances are your new joists will also sit on the wall plate with soffit flush with old ceiling joists.. but as said get your SE to confirm the detail its what you paid for..

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