Knauf Earthwool Acoustic Insulation

bluestreak56

So I'm looking at acoustic insulation in my house (which is becoming ground / 1st & 2nd floor maisonettes.

I want to try to get rid of as much noise as possible between the ground and first floor, loft and first floor and loft and aeroplanes (that fly almost directly overhead).

Most products give a db rating but Knauf Earthwool Acoustic Rolls do not. They come in 25mm, 50mm, 75mm and 100mm variants and I dont know what to go for.

Does anyone know whats good for what I need? Its a rental so I dont want to spend through the roof but at the same time I do want to absorb as much noise as possible as above.. The Knauf range seem to be the most cost efficient (unless anyone knows better?)

I need about 80m2 at least..

Any help would be much appreciated :beer:

jc808

it wont help much at all IMO

if its a rental why are you doing this? have you permission from ll? *just realised, are you the landlord?

how exactly will you fit the insulation?

warmhands.coldheart

Go for Slabs rather than Rolls, more dense and gives better absorption.. We use them in Acoustic Enclosures for Generators. This will only help airborne noise and not much use for vibration and noise from walking on floors etc as most of this noise is transferred through the structure of the building..i.e. Floor Joists etc so try to avoid wooden or laminate floors... stick to Carpets where Possible in living rooms and bedrooms with good thick underlay..

Ionkontrol

From downstairs, take ceiling down...
150mm Rockwool Accoustic Slab
2 x layers of Soundbloc plasterboard hanging off Resilient Bars, replaster.

Then upstairs, lay down some Noisedeck flooring over screwed down floorboards, then underlay and carpet. Job done.

Building regs will need to sign it off.

bluestreak56

Yes I am the landlord, I presently have access via the ceiling of the ground floor (plasterboarding not currently on) and through the floor of the loft (loft boards not currently laid)

So this would be the best time to complete it

warmhands.coldheart thats interesting as I had heard from other sources the opposite. That the solid slabs did not absorb the sound as well as the layered rolls as sound could reverberate through them.

Airborne noise is a real issue in the loft dormer to try and cut out the noise from planes overhead. However I also want to stop the downward noise from footsteps from dormer to 1st floor and 1st floor to ground floor.

I have found out that my joists are 200mm so would it be worthwhile getting say 50mm rolls / slabs and also adding in acoustic underlay matting to attack both side of the issue?

Ionkontrol - have you used the Rockwool stuff? It seems very expensive..

Ionkontrol

Yes, this is the spec I used on my flat. Works really well.
I got the rockwool for £50 a pack.

brightontraveller

[FONT=&quot]Which are you doing this to live in it yourself or just too rent or sell (meet the requirements of building control) having done this on many occasion for both which you require makes all the difference ?[/FONT]

bluestreak56

The idea is to rent it out.

I have gone for 50mm Knauf Earthwool Acoustic Roll 2x 600mm x 13m - 15.60m2 Pack from roofingsuperstore.co.uk as it was the cheapest I could find.

Its still costing me £284 + Postage as I needed around 125m2 of area to cover.

Will let you know if it helps with sound / warmth

brightontraveller

If you think that’s expensive I doubt very much you’ve thought about test required
Approved Document E are 62 dB and 64 dB. Very much doubt you’d ever achieve those with 50 mm Of course some just ignore these?

http://www.planningportal.gov.uk/uploads/br/BR_PDF_AD_E_2010.pdf

Normally its minimum 100mm, twin layers sound bloc resilient bars etc to be honest that’s not that great either?

Before you get order check joist spacing if its 300mm great cut in half more or less means lots of messing around cutting it? and the role stuff is a nightmare block much easier also get acoustic sealant something like Everflex Premium AC95 Instumescent Acoustic fill gaps between boards and around edges of all the plaster boards after first layer is up and again before second layer is plastered also cork gaps in floorboards also look at accustic underlays etc above If your renting it out doesn’t matter as much as living there yourself as some see it ? But remember that once its plastered painted floor down carpet etc will cost you considerable more to rectify

Primarily Airbourne (voice) sound is often be better broken up when traveling through multiple different densities better than one of same no air passage etc and impact sound is reduced by detachment with above included