Hello, I have two queries:
1. I live in a 1930s maisonette above a rather noisy family. There is no
sound proofing between our floorboards and their ceiling. I've read that
sand is a very good sound proofing material (roughly 1 cm depth laid on
boards that are then attached to the joists of the suspended floor). Has
anyone tried this and if so what success did they have and what sort of
costs are involved - the room is roughly 4m x 3m.
2. Cooking smells from downstairs manage to find their way into our kitchen
and airing cupboard via the pipes that run through both houses. What
materials could be best used to cover the hole that the pipes go through -
I'm presuming something that contains charcoal but am not familiar with
On Thu, 27 Nov 2003 16:09:31 +0000, John Armstrong
Be very carful about putting sand down, the weight can really add up,
at the very least you will want a poroous membrane that will take the
weight of the sand and transfer it ti the joists whilst not letting
the sand get through.
Have you ever thought about filling up the entire void with sawdust ;)
sorry the last comment is only a flippant one, you dont want anything
combustible in there.
Seriously though, a builder told me very recently on all new builds in
the area one of the building inspectors was trying to force to use of
some really heavy density rockwool looking material (normal rockwool
is supposed to be reasonable sound insulating) into the voids to kill
sound transmittance - and this was in an extenstion in a detatched
Are you getting a full spectrum of sounds, high and low frequency ?
One of the (many) reasons I bought a hundred year old flat was being told
that builders at the time didn't have skips, so the junk all went between
the floors, making excellent sound proofing.
Nice to know that it could be a fire hazzard!!
The full range of sounds are coming through, from the high pitch squeakings
of their twelve year old child to the bass from the television (they appear
to love any film with guns and helicopters). It can feel very intrusive. Is
rockwool better than sand or of equal sound reducing properties (it would be
a damn site easier to put in place considering it would not require fixing
to the joists)?
With a full range of sounds, looks like you should firstly follow the
other advice given and block up any gaps that could allow air movement
and hence the ease of noise transmittance.
You should (don't know with a shared property about have to) put some
form of metal meshing in place first to stop the rockwool from falling
in case of fire. i.e. to stop the further hazard of extra falling
debris, which would be red hot rockwool.
Is it really because they are a VERY noisy neighbour, or is it because
you have particularly poor noise insulation ? Have you talked to the
neighbours about the noise either that they are creating or ask if
they can easily hear you, or even if you could come in for a minute to
hear the noise level ?
Rockwool is a complete waste of time.
First line of attack is to block all direct air paths, then remaining
transmission is by structural vibration and resonances. You reduce that
my increasing the mass, and increasing the damping. Sand is excellent in
both respects. Look at car soundproofing. See any rockwool in a car? No.
What you see is slabs of rubbery stuff applied to metal sheets to
increase mass and add a bit of 'dullness' to the sound, plus dense fibre
matting as well. Look under your car carpet.
Best practice is to sand fill in ceiling/floor void, lay down dense
underlay and decent pile carpet, block up all pipe and duct runs between
properties, double glaze and keep windows shut. Even so the bass tones
will likely still come through.
On Sat, 29 Nov 2003 01:56:01 +0000, The Natural Philosopher wrote:
There is Rockwool and there is Rockwool. Stuffing roof insulation quilt
rockwool wouldn't be much use, although I expect it would help a bit. RW6
would be a different matter. Accoustic data at
Fair enough. If you read the rest of the post you will see that
cahracteristics of waht does work, described.
If that stuff has mass, it will be somewhat effective,
If the downstairs flat has a concrete ceiling, like our 1930s place,
then pouring extra sand in is likely to make little difference.
Neither is Rockwall, tried that also.
In our flat, most of the LF noise from downstairs is transmitted through
the walls :(
Foam every edge once you have taken the boards up then a loose layer of
visquene & perhaps some glass wool under that. On the plastic sheet put
some sand and then thicker boarding. It won't be as effective as moving
or murder but it will cost a lot and be an upheaval.
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG
And use it on the house designer.
Noise is a peculiar thing. Perfectly normal household activities can annoy
others in this type of house. I'd just mask the noise - if it's at normal
hours - by turning up my radio a bit.
*Never miss a good chance to shut up *
Dave Plowman firstname.lastname@example.org London SW 12
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