Under-floor insulation

[Pford75]

We're in the process of having our loft insulation topped up and I mentioned to the contractor that we are also considering both insulation and sound-proofing under the ground floor (above the cellar).

Some may recall that our cellar flooded at the New Year and we have a pump installed on a float switch. It has 2 natural wells in the cellar and is rather damp..although not wet.

The contractor suggested rockwool between the floor joists (with a special kind of insulation for sound proofing the pump noise).

Questions...

1. Does anyone know anything about sound-proofing insulation?

2. Assuming we did use mineral wool, could this cause damp problems to the floorboards and joists?

Before anyone suggests it, we would have liked to use Thermafleece...but the cost was just too high

 

[CHRIS]

You can use Rockwall as it gives very good sound proofing, and as it is a mixture of burnt chalk and fuzzy stuff it is quite breathable. The main problem the Greenwing have with Rockwall is the amount of heat and energy used to make it not what its made of.

If you look at some of the "specialist" sound proofing places they use product similar to Rockwall but 50 time the price so beware! We used this under our oak floor but above the cellar and held it in place with thin sheets of ply which could be bent and packed easily around the uneven split log beams - also stopped the draughts now I have added a few more vents from outside into the cellar. It would have been nice to use insulatiion and lath and plaster between the beams but as its a cellar I dont see the point. Maybe one day when I have time.

 

[Pford75]

Thanks for the advice.

The contractor advised that they would 'friction fit' the material (ie. cut it so it only just fits between the joists) and then put netlon across.

Looking forwards to stopping some of those draughts