stevesakiwi
New Member
Posts:6
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| 20 Oct 2011 03:59 PM |
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SIPS Co (Australia) manufactures SIPS with MgO skins & EPS cores. We have situations where we require acoustic (sound walls) in accommodation unit applications: ie adjoining domestic buildings.
We've acoustically tested with different MgO thicknesses in double wall situations with mineral wool in cavity: ie 12mm/90mm/12mm - 75mm mineral wool batts- 12mm/90mm/12mm.
We are still not able to meet Code requirements. The acoustic engineers recommend we need more mass in the walls as the low-end frequencies is where the system falls down......this testing is proving very expensive.
Ideas would be greatly appreciated.
Cheers; Steve |
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Fergie
New Member
Posts:30
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| 21 Oct 2011 05:44 AM |
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Steve have you tried using higher density EPS for this section of the project? |
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| R.J. Fergie Fergusson |
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stevesakiwi
New Member
Posts:6
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| 21 Oct 2011 05:57 PM |
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Hi Fergie,
Our standard EPS is @ 13kg/m3. It was suggested to use a lower density. One wall section has this @ 10kg/m3, whereas the other is at 13kg/m3......Do you think both walls should be a lot denser? |
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SimonD
Basic Member
Posts:167
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| 21 Oct 2011 08:01 PM |
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How about a triple lamination with an extra MGO board centered in the thickness of the foam core of the SIP. That will add mass and the extra change in material density will impede the sound energy. |
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| Building Designer PANELfusion, LLC Tampa, FL [email protected] "Metal SIP Advocate" |
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stevesakiwi
New Member
Posts:6
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| 21 Oct 2011 09:07 PM |
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Hi Simon,
Yes we have done that ie: 12mm/42mm/6mm/62mm/12mm 20mm air gap 8mm/72mm/8mm.
Came close, but it was the low end Hz that killed us.
Cheers, Steve |
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stevesakiwi
New Member
Posts:6
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| 21 Oct 2011 09:07 PM |
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Hi Simon,
Yes we have done that ie: 12mm/42mm/6mm/62mm/12mm 20mm air gap 8mm/72mm/8mm.
Came close, but it was the low end Hz that killed us.
Cheers, Steve |
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Fergie
New Member
Posts:30
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| 22 Oct 2011 12:02 AM |
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Hi Steve,
Well I cannot say for sure it would work perhaps use a FEA Analysis and see what comes out. I am not a engineer or designer we did do a project a few years back in Mexico a hotel and the designer used 30Kg/m for the floors OSB type SIPs. I remember asking why and he said that the STC ratings and strength were both factors.
I am looking for STC ratings now on some of the products but do not seem to be having luck from the factories as of yet, still early morning here in the M.E. so I might get some replies later if I do I'll post the numbers.
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| R.J. Fergie Fergusson |
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exipnos
New Member
Posts:6
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| 24 Oct 2011 02:55 AM |
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Check out http://forum.studiotips.com/viewtopic.php?f=9&t=52
This forum is frequented by Acoustical engineers and you might find something useful. |
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