Nov 26, 2010 08:07 pm Depends on what you're using. "R" is a value - Not a thickness or a material. Rigid fiberglass and rock wool are much thinner (yet much more dense and much more effective) than 'fluffy" stuff.
R30 insulation TOO thick for 2x4 walls?
Posted on Nov 26, 2010 02:43 pm
FATFryan
Member Since: Nov 14, 2010
If so, what's the thickest insulation I could easily put in 2x4 studs?
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Nov 26, 2010 08:07 pm Depends on what you're using. "R" is a value - Not a thickness or a material. Rigid fiberglass and rock wool are much thinner (yet much more dense and much more effective) than 'fluffy" stuff.
Nov 28, 2010 12:06 pm R-30 fiberglass insulation is designed to be in a roof or ceiling cavity framed with 2x10s. It is way too thick for 2x4 walls. Back in my day of construction work I think that the thickest 2x4 insulation was R-15. I believe that for 2x4 walls there is 11, 13 and 15.
Nov 28, 2010 03:18 pm Yeah, I just did a bunch of insulating, and yeah, the 9 1/2 inch thick stuff would fit in 2x4's but it would be totally crushed...having an impact on sound reduction...some like it compact, it depends which frequency ranges you are trying to control...but for insulating value it's meant to be puffy...therefore R13 or R19 would be what you are looking for regarding insulating.
And no, it wouldn't "easily" go into 2.4 studs, it'd take some pressure to hold it in place and big sheetrock screws, and a lot of them, to keep the pressure from pushing the screws thru the sheetrock.
Nov 28, 2010 11:15 pm I'm in the middle of remodeling our studio - the exterior walls are 2x6 and we used R19 in the walls and R25 in the lids. I'm pretty sure R19 could be 'fit' into 2x4 walls, if you truly desire optimal insulation properties, you don't want to pack too much fiberglass in the cavity or the efficiency decreases. At the same time, as another poster pointed out, if you're hoping to provide sound insulation to the outside world you should depend on more than just one layer of sheetrock and a little insulation. There are many factors that go into acoustics of a room internally and everything you do matters, but I really think you should focus on external soundproofing first and once the building is finished out then there are many applications available to produce good acoustics inside your particular space.
We are using the above mentioned insulation, but we are also double-layering the sheetrock (1/2"x2 on walls and 5/8" x 2 on lids) with a layer of this green stuff we spread inbetween the layers that's designed to acoustically isolate (partially, anyway) inside from outside walls - and it really does make a difference. If you can't afford the more expensive 'green' stuff then you can use caulk (spread like mastik, allowed to skin over) inbetween.
We've got it all taped and finishing prior to texture is going on tomorrow. Once that's done, it's paint, flooring, trim and then acoustic treatments and then, finally back to recording. At this point I am exhuasted and there is so much more to do.
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