Author Topic: Gaping holes between studio walls. Urgent help required  (Read 2730 times)


  • Guest
Gaping holes between studio walls. Urgent help required
« on: May 21, 2015, 08:42:06 PM »
Hi, and thanks for reading this.

After 5 years of planning, this year I finally took the plunge and started to build my own rehearsal room complex. After securing loans my business partners cousin offered to do the building work & everything was set. At least thats what I thought.

After a lot of research I decided that the following wall construction would be best;

12.5mm acoustic palsterboard
70mm metal stud filled with 45kg/m2 mineral wool
resilliant bar
12.5mm plasterboard
12.5mm plasterboard

After being persuaded that the best option was to construct the walls as panels that would be then lifted and joined together, I went on to spend 15k on making 90 panels. It soon dawned on me that I had been duped by the relative of my business partner, a combination of him never turning up, invoices going missing and even double charged on many items led me to kick him off site (before I kicked him somewhere else)

I have since contracted two shop fitters to help and I can't believe the difference in attitude and helpfulness. The only downside is their knowledge base of soundproofing. It turns out that the panels constructed by the previous builder are flawed, Meaning that when you attempt to join two panels together there is a gap of atleast 2mm. (I have tried to show this in a photo. I really need help as to what method is best to seal these gaps. I have ordered some acoustic sealant (evalast AC50) but I just don't see how that can soundproof such a gaping hole! Would crazy foam or some leftover mineral wool packed into the gap do a better job? or am I best leaving it as a sealed aigap?

Any help would leave me eternally indebted to you, I haven't slept in days with worry over this. The worst part is I have no way of knowing the sound isolation potential of the walls until this problem is fixed.

Randy S

  • Guest
Re: Gaping holes between studio walls. Urgent help required
« Reply #1 on: May 22, 2015, 03:26:37 PM »
The correct way is to remove the sheet rock and fix the problem correctly...

The "Band-Aid" would be to caulk all the gaps with acoustic caulk and then add another layer of sheet rock with "offset" seams so that no gaps are on the final layer except the gap required around the perimeter to maintain the float of the channel.

Randy S.


  • Guest
Re: Gaping holes between studio walls. Urgent help required
« Reply #2 on: May 22, 2015, 06:14:13 PM »
Thankyou Randy,

I think at this point I'm too close to the wire to rebuild so I might have to go down the "band-aid" root, at least that way I guess I gain more mass off the second layer of plasterboard.....silver linings and all that.

I think Im going to try this out on one room first to see how the STC stands up then roll it out throughout the complex if all goes well.

I'll be sure to report back, for now though, much needed sleep