Building with SIPS? Room in room wall but not ceiling. - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 3 Old 06-24-2019, 07:45 PM - Thread Starter
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Building with SIPS? Room in room wall but not ceiling.

Two questions

Anyone have experience with SIPS?
I was going to build my new house in SIPS because of the speed of install, insulation and air tightness.
However if you then add furring strips as many sidings require this makes it a triple leaf effect and if you add furring strips inside for drywall quadruple leaf. They start out with an STC of ~22 so they must be atrocious right? May just build all exterior walls 2x8 so insulation can be extra thick.

Secondly

Any point doing room in room walls but using clips on ceiling? because of the width of my room the span table says I need 10 inch ceiling joists so ill lose a foot of ceiling height. If not will just clip walls too.
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post #2 of 3 Old 06-25-2019, 05:13 AM
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I've never worked with SIPS but when I looked it up they are sandwich panels of board, rigid foam and board. I'm pretty sure the triple leaf needs an air space, so the outside furring is not creating a triple leaf. Inside and outside furring does create two air gaps. Building a wall with 2x8 with thicker insulation is not a sound containment strategy. Damped Isolated Mass is the key. Clips and channel, multiple layers of drywall with Green Glue. Many projects use one strategy for the walls like staggered studs and different method like clips and channel for the ceiling. The goal is isolation.


I'm not sure about your project and whether you have exterior and interior walls for the theater room. The construction methods might be different.
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post #3 of 3 Old 06-25-2019, 02:26 PM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
I've never worked with SIPS but when I looked it up they are sandwich panels of board, rigid foam and board. I'm pretty sure the triple leaf needs an air space, so the outside furring is not creating a triple leaf. Inside and outside furring does create two air gaps. Building a wall with 2x8 with thicker insulation is not a sound containment strategy. Damped Isolated Mass is the key. Clips and channel, multiple layers of drywall with Green Glue. Many projects use one strategy for the walls like staggered studs and different method like clips and channel for the ceiling. The goal is isolation.


I'm not sure about your project and whether you have exterior and interior walls for the theater room. The construction methods might be different.

Thanks BIG, yes I wasnt sure if the SIP expanded foam centre counted or not for additional leaf's. I will investigate further.
Sorry using the 2x8 for walls was so I could get the insulation value as high as a SIP and then apply the sound treatments, clips, channel, multi drywall and GG without worrying about the triple leaf effect.

As an aside, apparently the green glue guys tested a SIP wall of STC 21, drywall and greenglue on the inside made it STC 33 but drywall and green glue on the outside inside made it STC 61. Obviously you arent going to have drywall outside but very interesting to note if you are attempting to block external noise, planes, road, neighbours etc.
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