FuryRebuild
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| posted on 28/4/13 at 11:52 AM |
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OT - Acoustic insulation for floors/ceilings
So, we're doing a lot of decorating in a room above our living room, in which my daughter sleeps.
This is a once in a house-time opportunity to put some acoustic insulation in between the living room (with surround sound) and her bedroom (with
music in).
So, my options are:
1) acoustic insulation underlay type stuff, about £200 to do the room
2) get the floorboards up, put rockwool in the cavity and relay with fibre-boards. This will also allow me to get rid of the squeaking floorboard.
3) any other ideas from you all 
I have a circular saw with a depth-set, so I can whizz around the room and cut the boards to get them up with a crow-bar, and I appreciate this is a
one-way deal.
Any ideas on successful approaches?
Thanks
Mark
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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JoelP
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| posted on 28/4/13 at 12:01 PM |
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Id be inclined to do both, myself. Maybe after a good google to see what else can be done.
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coozer
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| posted on 28/4/13 at 01:58 PM |
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Kingspan or Celotex in between the joists.
I'm planning on putting some on the underside of the ceiling in the room below. This will be a full coverage primary to stop heat loss but would
also give good sound insulation.
Would it not be easier to do this and put a new ceiling up downstairs than to rip floors up?
Also if anyone has done what I'm thinking of and help or advise would be appreciated.
1972 V8 Jago
1980 Z750
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FuryRebuild
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| posted on 28/4/13 at 02:00 PM |
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The ceiling in the happily decorated living room below is in great nick, so I'm not taking it down.
However, the floor in the room above can be ripped out without issue and it's a quick job to put another one in using tongue-and-groove fibre
board.
When we had the extension done the builders put rockwool in the stud walls for sound-proofing which is why I was thinking of putting it in between the
joists.
M
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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cliftyhanger
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| posted on 28/4/13 at 04:10 PM |
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I have stuck rockwool between joists when I did some work on a house that is let out as flats. Makes very little difference.
The other day I saw a product at teh builders merchants. Looked remarkably like foam underlay glued to chipboard. Laid underlay down. I would be
inclined to try this, or something to get rid of the hard join from floorboards to joists. I would also look at a dense underlay on top, something
like the duralay stuff which is heavy. Something I am doing in our new house when I get on to the eldest daughters bedroom......
BTW do you reckon stuffing studwalls helps? again I have found it makes very little difference. The 2 walls are still rigidly connected....I reckon
double layer of plasterboard is more effective. And offset studs seem a good idea.
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FuryRebuild
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| posted on 28/4/13 at 05:40 PM |
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Thanks, Clifty. The most recent bit of stud walling had foam backed plaster board, so there may be something in that.
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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02GF74
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| posted on 30/4/13 at 07:54 PM |
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quote:
Originally posted by cliftyhanger
I have stuck rockwool between joists when I did some work on a house that is let out as flats. Makes very little difference.
I would tend to agree - the sound will be transmitted via the floorboards and joists - having the air filled with insulaiton material in between is
not going to make a huge difference - you need to look at preventing the sound reaching the solid parts e.g. a thick fluffy carpet on the floor and
walls.
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loggyboy
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| posted on 30/4/13 at 08:06 PM |
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Kingspan and celotex are generally thermal insulation. Mineral wool is best bet.
Mistral Motorsport
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loggyboy
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| posted on 30/4/13 at 08:09 PM |
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Also, be careful with circular saw, a lot of houses will have metal restraint straps screwed on to the side of floor joists, and even worse, elec
cables and water pipes close to the surface.
Mistral Motorsport
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nick205
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| posted on 30/4/13 at 08:43 PM |
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Thermal insulation products won't help much at all with sound insulation. This needs very dense absorbent materials and physical separation.
There are specific systems for spacing plasterboard off the joists/studs to achieve this and IIRC there are plasterboard products with increased sound
insulation properties.
Another approach is to double up on the plasterboard. This is often done on party walls of timber framed semis and terraces. It's quite
effective if done both sides of the wall. Maybe not suitable for ceilings though due to the extra weight.
I'm sure there was an LCB member who did this sort of work, can't think who it was though.
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