Insulating Partition Walls in new build?

rumar

We have started building our house and wondering is it the norm to put insulation between walls upstairs? It's not on the plans but the architect agrees it would be a good idea for sound and also to insulate between upstairs and downstairs. Would 100mm Rockwool sufficie for between the partition walls upstairs and 150mm for between upstairs and downstairs?

BryanF

You require sound insulation not thermal insulation for internal walls/first floor. The levels of insulation you outline are adequate.
The external envelope is where thermal insulation is required.

rumar

BryanF wrote: »

You require sound insulation not thermal insulation for internal walls/first floor. The levels of insulation you outline are adequate.
The external envelope is where thermal insulation is required.

Thanks Brian. I can't post links so will pm you if you can add it to this post please,

BryanF

http://www.knaufinsulation.co.uk/media/809692/datasheet-earthwool-loft-roll-40.pdf

rumar

Anyone tell me the difference between Rockwool and Earthwool? Rockwool seems more expensive and I need approx 15 rolls so the Earthwool would be a far cheaper option?

BryanF

Rock wool has better fire resistant properties. Earthwool is fine for your application but as I told you, it's not actually an acoustic insulation.

893bet

BryanF wrote: »

Rock wool has better fire resistant properties. Earthwool is fine for your application but as I told you, it's not actually an acoustic insulation.

What would you recommend for acoustic insulation in partitions?

BryanF

893bet wrote: »

What would you recommend for acoustic insulation in partitions?

There's loads of options, both manufacturers above supply actual acoustic products.
The real question is, what has been budgeted by the Qs? If nothing's been budgeted then go with the earthwool as it's cheap

893bet

BryanF wrote: »

There's loads of options, both manufacturers above supply actual acoustic products.
The real question is, what has been budgeted by the Qs? If nothing's been budgeted then go with the earthwool as it's cheap

Ok thanks. Will have a google for my options.

rumar

893bet wrote: »

Ok thanks. Will have a google for my options.

€35 seems to be the going rate for 150mm roll of Rockwell. Have you found it cheaper anywhere else?

bluemartin

rumar wrote: »

€35 seems to be the going rate for 150mm roll of Rockwell. Have you found it cheaper anywhere else?

€32 in Cork -snip-

teepee

you need a high density insulation to stop noise travelling , wood fibre of celluloses insulation at 75 kg per m3 would stop noise .

bertie 56

Rockwool has a range of acoustic stuff , ProRox Slab is the name.

braddun

you don't put insulation


you could pu double sheetrock on the walls

bertie 56

A good sound insulation for a wall or floor works with this principle :
mass - spring - mass.
The mass being the outer faces of your wall . You need something "heavy" there ( ie : plasterboard )
the spring being in between, you need something "soft" ( ie : mineral wool or other soft sound-insulation material ).

You have 2 different type of sounds to reduce : impact and airborne, so both material are important, the heavy one and the soft one.

I would definitively put both the two materials !

You can improve in increasing the tickness of both material, and a double layer of plasterboard as said will help. You can add resilient bars as well.
The only problem is that all this increase the total thickness of your wall, and therefore reduce your flooring area. It cost more as well, of course...

I will stay away of too soft material like Earthwool : too afraid it will sag over time in vertical.
You can have a good branded acoustic insulation for 9 euro/m2 inc Vat in 75mm, and 11 euro/m2 for 100mm, suitable for vertical .

Hope that helps !