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    What would you plaster these internal blockwork walls with?

    The walls divide off from the main living area the downstairs toilet & shower (wetroom), as well as another room which is the Utility/plant room housing GSHP & Hot water Tank, MVHR unit, washing machine, UFH manifold, and a utility room sink.

    We have built them in block to add some more thermal mass inside the insulation layer, thought it would be better for the shower cubicle/wetroom tiling, better for fixing some of the kit/pipework in the utility, and to provide a bit of added support to the staircase.

    Transmission of noise is probably the main consideration (but I don't want go to the lengths of resilient bars).

    These internal blockwork walls could be plaster-boarded and skimmed, or sand & cement plastered, or any other suggestions? I could also do a different finish on each side, e.g. wet plaster inside the shower room, P/B on the hallway and stairwell face.

    The external walls of the barn are all IWI insulated with 100mm PIR and so will be plaster-boarded and skimmed, so if we were to P/B these as well all the skimming could be done at the same time.
    I'm not sure if soundproof plasterboard would help much in this situation?

    Any thoughts?
    • CommentTimeOct 26th 2020
    The blocks already add a lot of mass so will reduce airborne sound effectively. That leaves impact sound, which they will transmit effectively. So you need to add some flexibility/isolation and then some more mass.

    You could use woodfibre board with plasterboard over the top, or resilient bars with plasterboard over. Doors and any other openings are likely to be a weak spot in sound isolation, make them heavy and ensure they fit well and/or seal the edges.
    • CommentAuthorrevor
    • CommentTimeOct 26th 2020
    I guess the noise you would be most concerned with is that generated at night. MVHR are quiet certainly mine is except when on boost so basically leaves the HP could that be soundproofed on its own?. Seeing the electrics is surfaced mounted I would plasterboard over as if you wet plaster the walls the skim coat over the trunking the plaster will be thin will show through or crack. My plant room is next to a bedroom a kitchen on the GF and en-suite and part bedroom over. It houses boiler MVHR manifolds TS etc and we are not disturbed by noise but we have resilient bars for the ceilings and any timber stud dividing walls. You may be over concerning yourself as DJH says you have some deadening mass. Make sure if you mount anything that can generate noise on a wall, you put on anti vibration pads/fixings/isolation to avoid transmission.
    • CommentTimeOct 26th 2020
    Washing machine will be the noisiest, so it depends when you run it.

    BTW, resilient bars are easy to obtain and install. And don't forget the ceilings as mentioned. Basically any gaps.
    Thanks for the tips. I could do resilient bars on the ceiling of the utility.
    Slightly conflicting requirements, but if you want to use the blocks as thermal mass, it's better not to have pb on with an air gap, as that resists the flow of heat into/out of the blocks.
    I could go wet plaster on the inside of the shower cubicle /wet room (better for tiling?) and also wet plaster the inside of the utility (better for fixing pipes & cables?)

    Then plaster board on the hall face and the stairwell face to keep the sound transmission down.
    • CommentAuthorowlman
    • CommentTimeOct 27th 2020
    It's possible go get acoustic lined plasterboard.
    • CommentAuthortony
    • CommentTimeOct 27th 2020
    I wouldn't plaster the outside, internally, wet plaster c&s and skim
    • CommentTimeOct 27th 2020
    Posted By: tonyI wouldn't plaster the outside, internally, wet plaster c&s and skim

    They're internal walls.
    Just for clarity the hall is on the left in the picture, the first doorway in the blockwork is the shower and W.C., the second doorway is the utility, the opening at the end of the hallway goes through to the single storey kitchen at the end.
    The stairwell is on the right (with the stairs drawn on the blockwork in pencil), the lounge is behind me / to the right with the open staircase in it.
    • CommentAuthorjfb
    • CommentTimeOct 27th 2020
    Given that you have all that in the plant room right by the kitchen/hallway/living room I would be very concerned about noise (as you rightly seem to be). I'd do as much as you can do to mitigate it as others have suggested.
    Quality of door and how well it is fitted will have an impact - maybe make sure it has seals like an external door.
    Ceiling and wall/ceiling junction important too.
    Also, have you got a sound attenuator on at least the supply side of the MVHR?
    Posted By: jfbhave you got a sound attenuator on at least the supply side of the MVHR?

    yes flexible silencers and rubber duct couplings.

    Posted By: revorif you mount anything that can generate noise on a wall, you put on anti vibration pads/fixings/isolation to avoid transmission.

    I think this is a very important point, thank you.
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