Vaulted Ceiling insulation

[Swingfingers]

I am in the process of converting the remainder of my garage into a 325sqft live room with a vaulted ceiling at a 6/12 pitch (same as the roof line). My question today is regarding ceiling insulation and protecting the live room from obvious outside noise though most notably the sound of heavy rain pounding on the roof.

My current plan calls for a tongue and groove ceiling insulated with R38 fiberglass batting plus a 1” air gap between the insulation and the roof (as required by code). All of this in a 12” vertical gap between the roof and the tongue and groove. I chose tongue and groove as my finished ceiling material due to the exposed trusses and the ease of manipulating the T&G around the trusses. It would have been a complete nightmare trying to sheet around the exposed trusses.

What are some of your opinions on how to beef up my ceiling insulation? Or is it enough? I kind of doubt it. I have considered installing rockwool above the fiberglass batting to increase the R value of the ceiling. I’m open to any suggestions. Thank you in advance.

-ignore the ceiling fan on the virtual pic

[tINY]

If you have pounding rain on a regular basis, the tounge and groove may be a problem.

You need a stiff, heavy barrier (like sheetrock) for effective sound isolation.

Also, a vaulted ceiling like that can lead to focusing issues.




-tINY

[Swingfingers]

Luckily I’m located in a region where we don’t get pounding rain on a regular bases.

Because of the existing trusses it’s next to impossible to sheet rock around the joints where the trusses meet the ceiling line. I appreciate the fact that sheetrock is more effective at sound isolation than T&G. Any thoughts on adding an additional layer of Rockwool or any other material in the ceiling to increase the sound isolation between inside and out?

I’d like to hear more thoughts on the possible focusing issue with vaulted ceilings like this. I do plan on treating the ceiling with 2’x4’x4” bass traps and other appropriate acoustic treatment. Thanks for your knowledge.

AA

[tINY]

When you get to the centerline of the room, both sides of the ceiling are the same distance from your ears or mic and cause odd sounds. It's a bit hard to describe.

The Master Handbook of Acoustics - Google Book Search

You can put mass loaded vinyl behind the T&G for some more isolation. Barrium Ferrite is the normal "mass" it's loaded with.

Soundproofing Mass Loaded Vinyl Barrier, Super Soundproofing Co
Mass Loaded Vinyl - SoundProofing America



-tINY

[quincyg]

I am currently build a small studio with vaulted ceilings. I decided to do an unvented roof assembly with closed cell polyurethane foam insulation, which acts as a vapor barrier. It is expensive, but will help with sound loss through roof vents.
has an r value of 6 per inch.

[quincyg]

It also looks like t&g will be a nightmare to install around those trusses. Maybe only a tiny bit easier that sheetrock, as you will have to do a lot of blocking. thats a cool look with the exposed trusses though.

[DanDan]

You need to find a locally available specialised product. I am hoping that his roof is not built yet. There should be a product out there which you would install under the roof tiles or shingles. A heavy and thick vapour layer if you will. This company does such products
REVAC BM00 Series : Noise Insulation Materials used in Acoustic Roof Membrane

DD
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