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Stud Wall & Ceiling Acoustic Insulation


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17 replies to this topic

#1 daiking

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Posted 22 February 2016 - 03:59 PM

I need to fill some short ground floor stud walls with insulation before they get plasterboard.

Will any general purpose insulation do? These types <a href='https://www.selcobw.com/products/insulation/multi-purpose-insulation' class='bbc_url' title='External link' rel='nofollow external'>https://www.selcobw....pose-insulation</a>

Is it important to full fill the wall thickness with it? I am flying solo now and don&#39;t know quite what I&#39;m doing.

Edited by daiking, 23 February 2016 - 10:05 PM.


#2 tonyshouse

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Posted 22 February 2016 - 05:25 PM

Insulation for sound use dense rockwool and several layers of plasterboard.

For thermal insulation use quilt, fully fill all voids them mitigate the thermal bridging of your studds with some additional sheet insulation.

#3 daiking

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Posted 22 February 2016 - 06:02 PM

As they're internal walls, I suppose it's acoustic rather than thermal but there's no performance requirement as such is there?

Is it a building reg? The stuff that was put in the ceiling void doesn't look/feel much different to loft roll/cavity batts.


#4 Onoff

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Posted 22 February 2016 - 09:18 PM

I scored some blue 'ish plasterboards from work when I lined was was the old attached outhouse. There was a stack left over from a fit out and I was told I could help myself. They were so heavy I only felt comfortable with 4 on the roof rack at a time. Think they were 10'x5' and 15 or 16mm thick. I found out later they were special acoustic ones. Brilliant, can't hear a thing through the 4" wall they're on.

Oh! Forgot to say they're on 2"x2" battens with Rockwool batts between.

Edited by Onoff, 22 February 2016 - 09:19 PM.


#5 daiking

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Posted 22 February 2016 - 09:40 PM

View PostOnoff, on 22 February 2016 - 09:18 PM, said:

I scored some blue 'ish plasterboards from work when I lined was was the old attached outhouse. There was a stack left over from a fit out and I was told I could help myself. They were so heavy I only felt comfortable with 4 on the roof rack at a time. Think they were 10'x5' and 15 or 16mm thick. I found out later they were special acoustic ones. Brilliant, can't hear a thing through the 4" wall they're on.

Oh! Forgot to say they're on 2"x2" battens with Rockwool batts between.
Is that a 4" solid wall with 2x2" battens?

I'm not too bothered as the sound isn't excessive now from the utility room into the living space. But if a bit of care now makes a difference in the future I can try that. Its not a big wall, only 3m long with a doorway but washing machine and tumble dryer live in there.

#6 Onoff

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Posted 22 February 2016 - 10:19 PM

View Postdaiking, on 22 February 2016 - 09:40 PM, said:

Is that a 4" solid wall with 2x2" battens?

I'm not too bothered as the sound isn't excessive now from the utility room into the living space. But if a bit of care now makes a difference in the future I can try that. Its not a big wall, only 3m long with a doorway but washing machine and tumble dryer live in there.

Christ! Don't do what I did.....if I'd have known what I know now etc! :o

The outhouse was formed from one painted brick cavity wall that had been rendered with "bullet proof" as in I couldn't chip it off, render. Then one 4" breeze wall and two 4" Celcon type cavity walls. A real mish mash and freezing cold - you might as well have been outside!

I basically lined it with 2"x2" and whacked Rockwool batts between. Then 1/2" plasterboard on the long walls and the 15/16mm acoustic stuff laid sideways on the short end walls. The sloping roof, I put some level ceiling joists in and 270mm of fluffy stuff. Luckily you stepped down into the room so I built a frame of 4"x2" in the garden and dropped it on the floor with 4" fluffy stuff between.

#7 daiking

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Posted 22 February 2016 - 10:28 PM

View PostOnoff, on 22 February 2016 - 10:19 PM, said:

Christ! Don't do what I did.....if I'd have known what I know now etc! :o

The outhouse was formed from one painted brick cavity wall that had been rendered with "bullet proof" as in I couldn't chip it off, render. Then one 4" breeze wall and two 4" Celcon type cavity walls. A real mish mash and freezing cold - you might as well have been outside!

I basically lined it with 2"x2" and whacked Rockwool batts between. Then 1/2" plasterboard on the long walls and the 15/16mm acoustic stuff laid sideways on the short end walls. The sloping roof, I put some level ceiling joists in and 270mm of fluffy stuff. Luckily you stepped down into the room so I built a frame of 4"x2" in the garden and dropped it on the floor with 4" fluffy stuff between.
:D I'm much better off than than. Slab and single external wall are to current building regs at least.

But the room side is only a single layer of 1/2" plasterboard. Spoken to wife and she doesn't want anything hung off the other side of the wall so I may add extra noggins/studs but don't intend to board with OSB under the PB.

#8 DavidWright

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Posted 23 February 2016 - 11:00 AM

View Postdaiking, on 22 February 2016 - 09:40 PM, said:

I'm not too bothered as the sound isn't excessive now from the utility room into the living space. But if a bit of care now makes a difference in the future I can try that. Its not a big wall, only 3m long with a doorway but washing machine and tumble dryer live in there.
Our 1970ish bungalow has floor joists that look very skinny compared to modern standards. We get a lot less noise from the utility room since I added an extra layer of T&G chipboard very firmly screwed to the joists, plus a 3x2 perpendicular to and across 4 joists behind the washer, to stiffen it all up. The washer no longer bounces itself across the floor on spin!

#9 daiking

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Posted 23 February 2016 - 11:22 AM

View PostDavidWright, on 23 February 2016 - 11:00 AM, said:

Our 1970ish bungalow has floor joists that look very skinny compared to modern standards. We get a lot less noise from the utility room since I added an extra layer of T&G chipboard very firmly screwed to the joists, plus a 3x2 perpendicular to and across 4 joists behind the washer, to stiffen it all up. The washer no longer bounces itself across the floor on spin!

Thankfully its on a skid floor and is relatively quiet anyway. I've also just seen that the absolute Canute has used 9mm PB on the living space side and royally @!## up the stud work around the door.

#10 daiking

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Posted 23 February 2016 - 07:12 PM

Saw the building inspector today. From him:

Stud walls without doorways need full fill of min 10kg/m3 insulation

Stud walls with doorways don't have that requirement

Intermediary floor spaces need 100mm of appropriate insulation (as walls)

#11 daiking

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Posted 23 February 2016 - 10:08 PM

Now I'm looking into it it looks like even fluffy lightweight loft insulation meets the 10kg/m3 requirement and really won't be very good.

Am I really going to get much better performance with a product like Earthwool Acoustic Roll? http://www.knaufinsu...l-acoustic-roll

Which looks similar. Is there a better and readily available product? Oh and not that expensive.


#12 daiking

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Posted 24 February 2016 - 09:10 AM

Apropos nothing, I'm going for this https://www.selcobw....0-x-50mm-8-64m2

70mm in the walls, even the pointless wall and 100mm in this bit of ceiling

Edited by daiking, 24 February 2016 - 11:58 AM.


#13 daiking

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Posted 27 February 2016 - 12:52 AM

Ready for the spread tomorrow

This

Posted Image

To this

Posted Image

#14 Trw144

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Posted 27 February 2016 - 10:03 PM



What i don't understand is why the universal slabs mentioned above have a much higher density than their specialist acoustic products and seem to be less money? 75mm universal slab at 45kg/m3 are coming in around £12 a pack for 4.3m2

Edited by Trw144, 27 February 2016 - 10:14 PM.


#15 daiking

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Posted 27 February 2016 - 11:02 PM

View PostTrw144, on 27 February 2016 - 10:03 PM, said:



What i don't understand is why the universal slabs mentioned above have a much higher density than their specialist acoustic products and seem to be less money? 75mm universal slab at 45kg/m3 are coming in around £12 a pack for 4.3m2
I've no idea, it's all new to me. Luckily I'm only playing with insignificant amount so cost is not a big issue.

Next time I'll use cheaper stuff. Yeah, like there'll be a next time.

#16 doofaloofa

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Posted 28 February 2016 - 12:50 PM

disappointed you did not use old egg trays on the walls

#17 daiking

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Posted 28 February 2016 - 01:52 PM

View Postdoofaloofa, on 28 February 2016 - 12:50 PM, said:

disappointed you did not use old egg trays on the walls
If only I'd had some.

My plasterer is just skimming the utility room now so it's too late.

#18 doofaloofa

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Posted 28 February 2016 - 04:03 PM

probably for the best