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Please help with bearer requirements for room-within-room sound room

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  1. #1
    Apprentice (new member)
    Join Date
    Apr 2008

    Default Please help with bearer requirements for room-within-room sound room

    Hi there, please if you can help with this I would be most grateful.
    I am building a room within a room as a sound room on the ground floor of my house - so there is going to be a timber frame on a concrete slab...and bearers on the top of that frame to support my ceiling.

    Unfortunately I do not have much height to play with...and cannot use the 45x120s mgp10 for the bearers that I had planned if I want a 2.4m ceiling height....

    The distance - slab to bottom of joists (of the floor above) is just 2570mm
    Floor - 10mm (thin laminate on polystyrene)
    Ceiling - 3 layers 16mm firecheck gyprock - 48mm...call it 50!
    bearers 120mm
    Leaves 2390...just under the 2.4m....

    I could move to 13mm soundchek gyprock - but it's still border line....and the recommmendation from the sound folk is to go with the 16mm firecheck.
    I could also 'interleave' the bearers of this room-within-a-room with the joists above - but I am unwilling to remove the blocks between those joists as they are long runs!

    My bearers are going to be spanning about 1920mm

    Can I use 45x90s instead of the 45x120s - and if yes - what spacing do I need? I really don't mind lots of bearers as it gives me more places to screw the firecheck to!

    Or is there an alternate material I can use as the bearer that I can screw my gyprock to?

    Many thanks...PS I would MUCH rather over engineer than under, just in case I end up doing a 4th layer of gyprock.

    Also the firecheck is about 13kg/m2 (36kg for a 1200x2400 sheet)

    Thank you so much for your help.


  2. #2
    Apprentice (new member)
    Join Date
    Apr 2008


    Just for information. Peter Clarkson at Ausdesign www.ausdesign.com.au was kind enough to get back to me on this directly (as I had sent him a PM) and said: 90*45 mgp10 rafters (ceiling joists) at 450 centres carrying 40kg/m2 can span 2600mm. Thanks so much Peter!
    NB Peter's proviso - This information is intended to provide general information only. It does not purport to be a comprehensive advice.

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