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Plasterboard staggered?

Discussion in 'Plastering and Rendering' started by xdrive, 27 Jul 2020.

  1. xdrive

    xdrive

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    If the pink plasterboard is not used then how else can 30 mins be achieved? Double normal board?
     
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  3. bennymultifinish

    bennymultifinish

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    normal pb is rated at 30 mins.
    fire boards are 60 mins .
     
  4. xdrive

    xdrive

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    As far as I know Normal plasterboard is rated 15mins and pink is 30 mins.
     
  5. frutbunn

    frutbunn

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    Depends on the period required and d
    Ignore this comment its just nonsense, the test is to the entire flooring system not just the board.
    12.5mm plasterboard can give 30 mins
    12.5 + 15mm wallboard can give 60mins
    But these are dependant on joist size, spacing, floor decking thickness, insulation in void etc., see link for further info
    https://www.british-gypsum.com/tech...0-or-60-minute-fire-rated-horizontal-membrane

    see above.
    As far as I know no one tests to 15mins, or at least in the UK as it would be a pointless excercise, no reference is made to 15mins FR in the B Regs.
     
  6. bennymultifinish

    bennymultifinish

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    it was a ‘general rule of thumb’ statement.
    you just literally copied and pasted what’s on british gupsum website.
    he could have done that.
    obviously he’s not going to stand a standard pb on edge in his loft and expect it to perform the same way as if its attached to a 100mm stud packed with fire rated insulation.
     
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  8. frutbunn

    frutbunn

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    This used to be in the appendix of the approved document Part B, as examples of construction satisfying the B Regs (an idiots guide!), they no longer do this so you have to reference manufacturers information and verify its been tested etc. It was probably a hangover frpm the "deemed to satisfy" clauses from the older format pre 86 regs.. The examples I have quoted have been independently tested to BS 476 for a FLOOR situation.
    Obviously a floor test would gives different results to a wall test, the certification makes this very clear. I only referenced the website to back up what I am saying is correct.
    Can you reference where it states a "rule of thumb" is acceptable evidence of periods of fire resistance? Your rule of thumb did not state any thicknesses or number of layers is required, so presumably a single layer of fire line gives 1 hour and 9.5mm plasterboard gives 30 minutes, according to your "rule of thumb".
     
  9. bennymultifinish

    bennymultifinish

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    you gave your initial statement based on a floor test. then tried to salvage it. now your’e trying to make yourself look credible again by trying to discredit my ‘general rule of thumb ‘ statement by trying to imply that ANY builder would use a 9.5mm pb in even , lets say a stud partition.

    all he has to do is use firelines like i tried to steer him towards at the start and which you tried to steer him away from.
     
    Last edited: 6 Sep 2020
  10. bennymultifinish

    bennymultifinish

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    why would you instigate a dispute when you should know full well that the answer is there is no answer, unless your’e actually standing in his house presented with his situation.
    sounds like someone else i know on here.
     
  11. xdrive

    xdrive

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    :eek:

    What I gather is

    12.5mm normal plasterboard will suffice.
    Fire board would give more protection.

    Cheers
     
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