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Loft conversion herringbone for Joists

Discussion in 'Floors, Stairs and Lofts' started by shedifice, 9 Jul 2019.

  1. shedifice

    shedifice

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    HI,

    I am installing new floor joists between ceiling rafters for a new floor for a habitable loft conversion. I want to put herringbone straps in between joists to stiffen the floor. I cant fit timber struta as they will clash with the ceiling rafters so would like to use metal ones.

    The issue is my joists are on a 350 pitch and commercial galv straps are for 400 centre joists at the minimum.

    Do you thinks that using plain galvanised banding for the straps, instead of commercial fabed ones will be just as effective? I am thinking of nailing to the top and bottom of the neighbouring joists.

    L.
     
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  3. I assume you mean you are installing new floor joists between the existing ceiling joists (not the rafters ) and the joists are at 350mm centres :!:
    You should allow the bottom of new joists being 25mm above the bottom of existing joists . Not sure what you intend doing with the banding but it is not a suitable replacement for strutting .
     
  4. shedifice

    shedifice

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    HI, Thanks for the reply. I am leaving 25mm below the new joists.

    These are the struts you can buy but they will not work on 350 center joists
    [​IMG]

    As the straps work in tension I was considering making them from banding

    upload_2019-7-9_23-3-41.jpeg
    I was hoping that as long as they were installed tight then they would do the same job.
     
  5. tony1851

    tony1851

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    They don't work in tension, they work in compression - that's why the patent ones have a stiffening rib down the middle.
     
  6. JobAndKnock

    JobAndKnock

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    What's the problem with using solid strutting? We put loads of it into refurbs where the existing flooring cannot be removed or where the existing ceiling is cross battened
     
  7. WLoverbd2

    WLoverbd2

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    I think the issue is to do with the requirement that the depth of the strutting needs to be at least 3/4 the depth of the joist which then means that the solid strut clashes with the existing ceiling joists.
     
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