I'm in the throes of converting a large victorian house into flats.
For the benefit of noise and vibration suppresion between the units
I'm told that I need to install ceilings that are separate and in no
way attached to the joists of the floorboards above.
My architect has suggested that I install a second set of joists
positioned just below the existing ones to which I can attach the
plasterboard. However this will be far more difficult than it sounds.
I recall hearing of other systems that are just as effective but far
simpler to execute, can someone remind me as to what they are?
Many thanks in advance,
Sound recording studios have things called floating floors and made from
carpet underlay placed under flooring grade chipboarding systems. I would
have thought your architect would have heard of such systems, but then he is
only an architect right enough.
The best system is made from the thick fibre felt that is used to keep plush
carpets plush, and it is ideal under chipboard for sound dampening on floors
in studios. The chipboard isn't screwed or nailed down, but is glued
together to stop it separating. It stops sound in both directions as well.
You obviously know nothing of such matters.
A 25kg/m3 high density mineral wool roll or rigid batt that fits properly
without compression. Dedicated acoustic felts cost and arm and a leg and
yet don't perform much better than good mineral wools.
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Eh? Rockwool is sold as a noise reduction product!
It isn't quite the same as the stuff that's sold for thermal
insulation - same base material, different manufacture to
optimise sound reduction - but even the thermal insulation
product has some noise reduction effect. It won't stop noise
transmitted through the structure, but it will dampen noise
transmitted through air. My neighbour reported a significant
reduction in traffic noise in the bedrooms when he had is loft
insulation topped up to modern standards.
On 17 Jan 2004 13:57:20 -0800, a particular chimpanzee named
chris firstname.lastname@example.org (ChrisD) randomly hit the keyboard and
The conversion will need to comply with the requirements of Building
Regulations anyway, and will need to be tested on completion. Have a
look at Approved Document E (http://tinyurl.com/yq29z ) for the
Basically, if you don't want an independent ceiling, you have to go
with a floating layer above the existing floor. This will raise your
floor level by about 50mm at the very least, which may mean that you
need to alter all the doors and frames, rip out all the existing
skirting boards, etc. There are proprietary systems for both
approaches which may limit their impact (such as British Gypsum), but
the sound insulation either has to go above or below.
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