John Sayers' Design Forum

John Sayers' Recording Studio Design Forum

A World of Experience
Click Here for Information on John's Services
It is currently Tue Jul 07, 2020 7:02 am

All times are UTC + 10 hours




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Fri Jul 06, 2018 7:46 pm 
Offline
Senior Member

Joined: Sat May 20, 2017 7:47 am
Posts: 367
Location: Lincolnshire, UK
Ok guys, so my first layer on my ceiling uses OSB3 tongue and groove boards 18mm thickness. I was planning on caulking the expansion gaps, but hesitated due to them... being expansion gaps.

I'm not expecting much expansion as the room will be heavily insulated and airconditioned.

If I don't caulk the joints then mass will be less along the joints. I'm doing 2 layers of plasterboard on top so I shouldn't have issues with the airtight seal though.

I'm leaning towards caulking them ( they'll still expand 25%ish of the original amount as the caulk is flexible, and I believe the OSB shouldn't have drastic temperature changes as it is beneath 100mm rockwool and will have 200mm below it.

What are your thoughts?

_________________
Stay up at night reading books on acoustics and studio design, learn Sketchup, bang your head against a wall, redesign your studio 15 times, curse the gods of HVAC silencers and door seals .... or hire a studio designer.


Report this post
Top
 Profile  
 
PostPosted: Fri Jul 06, 2018 10:18 pm 
Offline
Senior Member

Joined: Sat May 20, 2017 7:47 am
Posts: 367
Location: Lincolnshire, UK
Looking into it, I've come to the conclusion that I will caulk the t&g expansion joints. It seems that the expansion joints come into play mainly when the OSB takes on moisture, but as the OSB is a middle leaf inside the water-tight building evelope, is OSB3 (water resistant), my room will be humidity controlled, and the caulking is flexible, I don't forsee this becoming a problem.

_________________
Stay up at night reading books on acoustics and studio design, learn Sketchup, bang your head against a wall, redesign your studio 15 times, curse the gods of HVAC silencers and door seals .... or hire a studio designer.


Report this post
Top
 Profile  
 
PostPosted: Fri Jul 06, 2018 11:42 pm 
Offline
Senior Member
User avatar

Joined: Thu Aug 21, 2008 10:17 am
Posts: 11938
Location: Santiago, Chile
Yes, caulk it. Always caulk any gaps, anywhere.

Quote:
If I don't caulk the joints then mass will be less along the joints.
Right. And there won't be a good seal...

Quote:
I'm doing 2 layers of plasterboard on top so I shouldn't have issues with the airtight seal though.
Ummm..... You have to seal EACH layer INDIVIDUALLY. Each layer by itself must be fully sealed, if you want maximum isolation.

Quote:
they'll still expand 25%ish of the original amount as the caulk is flexible,
You should be looking for a better caulk, then! Most good caulks can handle a lot more than 25%.

Quote:
I've come to the conclusion that I will caulk the t&g expansion joints.
:thu:


- Stuart -

_________________
I want this studio to amaze people. "That'll do" doesn't amaze people.


Report this post
Top
 Profile  
 
PostPosted: Sat Jul 07, 2018 1:51 am 
Offline
Senior Member

Joined: Sat May 20, 2017 7:47 am
Posts: 367
Location: Lincolnshire, UK
Hi Stuart, thought you'd say that! Obviously sealing every layer is ideal as there is more redundancy incase of sealant failure, Bmbut I also want the sheathing not to buckle ;), that's why I considered before caulking it.

My caulk is highly rated Everflex AC50

_________________
Stay up at night reading books on acoustics and studio design, learn Sketchup, bang your head against a wall, redesign your studio 15 times, curse the gods of HVAC silencers and door seals .... or hire a studio designer.


Report this post
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC + 10 hours


Who is online

Users browsing this forum: prgc and 85 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group