Author Topic: SIP Roof & Soundproofing  (Read 6694 times)

Pettrix

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SIP Roof & Soundproofing
« on: October 21, 2013, 06:14:24 AM »
I am designing a home with a SIP (Structurally Insulated Panel) roof. It consists of 12" EPS foam sandwiched between two steel panels. I know that the panel itself carries an STC rating of 26, which is bad but here are my plans to improve that:

- Planning to use Kinetics Resilient Sound Isolation Clips/ISOMAX to decouple the SIPs.
- I will install furring channels within the clips. This will give me a 2" deep cavity between the SIP and hat channel top.
- I plan on installing 5/8" sheetrock/drywall on the hat channels.

My questions are as follows:

1 - What should I install within the 2" channel between the drywall and SIP? I was thinking of using fiberglass batts or rockwool.
2 - Someone told me to install 2" rigid foam EPS in the channel. Isn't rigid foam/EPS a poor sound insulator?
3 - Fiberglass batts are usually 3" thick so would sticking them in a 2" cavity hurt my STC rating?
4 - Am I on the right track with the resilient sound clips to help my STC ratings?


Randy S

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Re: SIP Roof & Soundproofing
« Reply #1 on: October 21, 2013, 03:53:27 PM »
Your plan is going to deliver a good reduction.
Here's where I would make corrections:
1) in between the channel system use R-8 insulation (cotton fiber or mineral wool) not rigid.
2) Mass is very important so I would use at least 2 layers of 5/8" sheet rock on the channel.
3) make sure you leave the perimeter gap and fill with acoustical caulking.
4) for improvement, you can add green glue dampening compound between the 2 layers of sheet rock or mass loaded vinyl to increase mass.


 
Randy Sieg

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Pettrix

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Re: SIP Roof & Soundproofing
« Reply #2 on: October 22, 2013, 03:29:53 AM »
Your plan is going to deliver a good reduction.
Here's where I would make corrections:
1) in between the channel system use R-8 insulation (cotton fiber or mineral wool) not rigid.
2) Mass is very important so I would use at least 2 layers of 5/8" sheet rock on the channel.
3) make sure you leave the perimeter gap and fill with acoustical caulking.
4) for improvement, you can add green glue dampening compound between the 2 layers of sheet rock or mass loaded vinyl to increase mass.

Thanks for the info!

How thick should the R-8 insulation be? In a 2" cavity, should the insulation be 2" thick or 2.5" thick?
Why do you mean by perimeter gap?
Why is rigid foam a bad sound insulator?

I can only do one layer of sheet rock because of ceiling loads and cost.

Randy S

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Re: SIP Roof & Soundproofing
« Reply #3 on: October 22, 2013, 03:41:51 PM »

Thanks for the info!

How thick should the R-8 insulation be? In a 2" cavity, should the insulation be 2" thick or 2.5" thick?
Why do you mean by perimeter gap?
Why is rigid foam a bad sound insulator?

I can only do one layer of sheet rock because of ceiling loads and cost.

use R-8 insulation that is 2" thick.

The perimeter gap is to prevent a drum head effect and keep the ceiling truly decoupled. This gap must be filled with acoustical caulk / perfect seal.

Rigid foam can actually assist in the transmission of vibration ie. sound


Finally, as for the load and cost...the whole system will only weigh about 5lbs a sqft. with double layer sheet rock..most ceilings can hold this weight. I would contact the structural engineer and ask him.
trust me when I say, mass is your friend with this type of ceiling system...
Randy Sieg

Super Soundproofing Co
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888-942-7723
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Pettrix

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Re: SIP Roof & Soundproofing
« Reply #4 on: October 23, 2013, 04:32:36 AM »
use R-8 insulation that is 2" thick.


What about using Roxul AFB at 2" thick?
http://www.roxul.com/products/building+envelope/roxul+afb

I could use the added R-Value and it supposedly has greater sound control values than fiberglass batts.

In regards to the sound clips and furring channels. Installing them at 24" OC x 48" OC would make the Roxul batts fit perfectly between the channels since the Roxul is 23" wide. What say you?
Planning to use Kinetics Resilient Sound Isolation Clips/ISOMAX to decouple the SIPs.


Randy S

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Re: SIP Roof & Soundproofing
« Reply #5 on: October 23, 2013, 06:27:52 AM »
Roxul will work or ultra touch cotton fiber www.bondedlogic.com which ever is easier to acquire.

good job on the clip and channel layout , that is perfect and the maximum spread for use with a double layer sheet rock system.
http://www.supersoundproofingsales.com/SSP-Clips-1/productinfo/09-IS/

dont forget the 1/4" perimeter gap to be filled with acoustical caulk.
http://www.supersoundproofingsales.com/SSP-Acoustical-Sound-Sealant-Caulk/productinfo/09-42745-S/

I am still going to recommend at least a double layer sheet rock with offset seams...or your going to have to butter the edges of the first layer to insure airtight seal between sheet rock.

send me an email and I can send you the clip and channel instruction sheets.

Randy S.

randy@soundproofing.org

Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

Pettrix

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Re: SIP Roof & Soundproofing
« Reply #6 on: October 27, 2013, 06:37:50 AM »
What do you think my final ballpark STC ratings will be with my setup?

The SIP itself is around STC 28.

Thanks!

Randy S

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Re: SIP Roof & Soundproofing
« Reply #7 on: October 28, 2013, 03:38:40 PM »
The system itself based on a 6 sided equal cube I would estimate around 50 STC conceivably due to the lack of mass. The clip and channel ASTM testing show 61 STC in a zero flank environment.
Since you are only doing a single partition your real field value should be some where between 40 -45 STC.
Which is still a really good value based on cost.


 
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040