Open cell spray foam vs Rockwool for whole home - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 01-08-2020, 10:55 AM - Thread Starter
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Open cell spray foam vs Rockwool for whole home

I’m building a new home and currently at the insulation stage.

The walls studs are 2x6 so I can fit 5.5in of insulation. My main concern is noise since there are a lot of barking dogs down the road.

I have the two options below and not sure which would be best to use for all the exterior walls. Keep in mind that the rooms also have two double paned vinyl windows. There seems to be a lot of articles that say open cell and Rockwool are basically the same sound wise, or Rockwool is slightly better. What do you guys think?

Sucraseal SES open-cell spray foam 5.5in
- $680
- product page said it’s sound absorbing (don’t know to what extent)
- cheaper and readily available

Rockwool 5.5in
- $1160
- well regarded for sound absorbing
- more expensive, less of an air seal, can only ship in at least 3 weeks
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post #2 of 5 Old 01-08-2020, 02:48 PM
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I can’t compare to open cell but for what it is worth, rockwool is impressive stuff. I wish I wash building a house right now because that stuff would be going everywhere.


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post #3 of 5 Old 01-09-2020, 01:41 PM
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Came across this. Thought it may help.


https://www.jm.com/content/dam/jm/gl...ence-Guide.pdf

Search for stc hud.gov for a similar pdf


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post #4 of 5 Old 01-09-2020, 01:47 PM
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Rockwool has two separate lines, one for insulating temperature, the other for sound insulation. They do different things. I do not know how good the Rx does with sound, but when my contractor bought it from Home Depot to put around my bathroom walls, I had him return it and buy the Safe 'n Sound instead. What is the R value of the Rockwool you're looking at?
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post #5 of 5 Old 01-09-2020, 07:17 PM
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I’m not sure but don’t think it is much. I used the safe and sound ~3.25 or whatever it is for 2x4 interior basement walls and I’m between joists. For sound that is it. I now see you’re after insulation + sound dampening. I’d imagine insulation is more important that sound for you at this point. I was just offering what I’ve experienced with the safe and sound.

We moved into a fantastic home a year ago and unfortunately only now realizing just how loud the truck traffic is. I’m determined to decrease the noise pollution.

We have three stories - first floor - trees take care of most of the road noise - but the other two are ridiculously loud. (I will not only visit homes on sundays that i intend to buy)

After the safe zone - basement is finished - I’m going to make a test room on the second floor.

I’m trying to find a wholesaler who sells acoustic grade acrylic so I can take a stab at diy window inserts. The resale inserts I see are +500$ each. Not feasible.

Second, I might sandwich a ‘mass loaded vinyl’ product between existing drywall and an additional layer of 5/8 drywall. Might be an option for you - or even two layers of 1/2.

Sounds like my problem is much larger than yours but just tossing out ideas.

Good luck


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