On May 19, 8:05*pm, robert wrote:
On 19/05/2011 11:03, Dave Plowman (News) wrote: In article
,
* * Andy *wrote:
On May 18, 7:34 pm, *wrote:

However, I want to put in some proper acoustic stuff inside the boxing
around the PVC soil pipe to minimise the flushing sounds.

You need some mass in there. Layers of high-mass material, flexibly
mounted, with layers of wool between them. *Chipboard is one of the
cheapest, Cement board is best, MDF isn't bad. If the location fits,
hanging boards on wire from above is a good way to install it.

Plasterboard is pretty good as regards density/cost.

If you have access to the soil pipe then a purpose made acoustic
pipe/duct insulation works exceedingly well - when I used it a few years
ago I used a sheet material which I cut in strips to wrap round the soil
pipe, fix with cable ties and duct tape.
However I think you can get it preformed to standard sizes now.
Not a cheap option, but doesnt take much space up and very effective.

Any details about this product and suppliers ?
Simon.