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Old 11-06-2019, 01:34 PM   #1
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Bedroom wall options


I have a single story house in northern NM. Our bed room is always cold in the winter warm in summer. The original insulation is old rock wool that I am sure is sagging in the walls.
I am going to rip all the drywall out and start over this is what I have been thinking,

1st option spray foam in between 2x4 studs, cover with 1/2 in ridged foam over the studs for the whole wall then cover with drywall.

2nd fiberglass, air seal with can foam, same 1/2 foam over studs.


What do you guys think ?

Thanks
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Old 11-06-2019, 01:45 PM   #2
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Re: Bedroom wall options


You sure that is the best use of time and money here? Is the home air sealed? What is the exterior cladding? Slab on grade?

HVAC distribution and location relative to the room in question?
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Old 11-06-2019, 02:08 PM   #3
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Re: Bedroom wall options


First thing to check would be your heating and air conditioning. Are they working? Also, insulation will not help anything if the thermostat is too low. Best insulation will not work well under direct sunlight. Screening with plants, etc, can help big here.

If poor insulation is the main reason, then it's best to look at the air seals first. Framing joints, windows and anything connecting your room to other areas. Pipe going through, electric cables, hvac ducts? Duct coming through from unheated bsmt, example, can bring in lots of cold air. Along chimney chase going up through the attic, is another cold spot.
For fairly easy seal and insulation from inside, I'd put 1/2" xps board against the sheathing, push through all the siding nails. Cut this board 1/4" short all sides and fill with canned foam. Gentle control can get you unwasted beads of the foam. If nails are problem, divide the board into half, thirds, whatever necessary to fill the cavity and fill the joint with foam. Then put r13 fiberglass.
Extra half or one inch foam on top may not be necessary. Energy is lost through the studs but effective insulation for that, I read, is 1.5" foam board. Another good air seal is caulking along the plywood floor deck and the wall/ceiling plates. DAP painters caulk is the cheapest now and is very cost effective.
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Old 11-06-2019, 02:34 PM   #4
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Re: Bedroom wall options


House is on a slab, stucco on the outside. As far a air sealing, some has been done in the in the above the ceiling. The insulation above the ceiling is mismatched and will be replaced .
I can feel the air through the walls.
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Old 11-06-2019, 02:36 PM   #5
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Re: Bedroom wall options


Forced air, with the ducting in the floor through the slab.
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Old 11-06-2019, 03:00 PM   #6
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Re: Bedroom wall options


The rockwool has a slightly higher R value than fiberglass, so ripping out the rockwool and replacing it with fiberglass does not seem logical. Rockwool is also stiffer than fiberglass and less likely to sag. I find it unlikely that rockwool batts in your walls have sagged.

Closed cell urethane sprayfoam will have an R value of about 6 per inch, and will make your walls airtight. Much better than either fiberglass or rockwool. Its pretty expensive though.

The term "foamboard" means nothing to me. Is that XPS, EPS, other ? What is the reasoning for the 1/2" sheet ?
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Old 11-06-2019, 03:27 PM   #7
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Re: Bedroom wall options


yea sorry foam board = rigid foam (xps or EPS). 1/2 sheats would go over the studs under the drywall. Basically as another layer.

The rock wool is from 1968 I have the same stuff in the attic, its only 4in thick, like r8.
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Old 11-06-2019, 04:25 PM   #8
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Re: Bedroom wall options


Fiberglass batts typically R 2.9-3.8 per inch.
Rockwool batts typically R 3.3 -4.2 per inch.
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Old 11-06-2019, 08:58 PM   #9
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Re: Bedroom wall options


Quote:
Originally Posted by SPS-1 View Post
Fiberglass batts typically R 2.9-3.8 per inch.
Rockwool batts typically R 3.3 -4.2 per inch.
Thanks for that, so I guess at this point I just need to see whats in there, and if the rockwool is ok leave it and add some .
Air sealing is the main reason I want to open up the wall.
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Old 11-07-2019, 04:41 AM   #10
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Re: Bedroom wall options


Stucco wall should be more air tight. Check the bottom edge for seal. The air movement (or just some cold air?) you feel could be just the convection in the cavity. I agree that you can reuse the rockwool you have. Just double them, after air sealing, and buy what you need. If they're r8, double layer will not get you r16.

There was a recent post of about compressing fiber insulation. It is fine to compress them but 2x4 will get you only about r13 no matter how much is stuffed in.


Stucco holds more heat so it will be a good thing to shade the wall.
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Old 11-07-2019, 05:59 AM   #11
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Re: Bedroom wall options


More on what carpdad was saying about bottom of wall - should be gasketed and/or caulked. If not sealed will get air leakage. If you have carpeting and the edge of the carpet, against an outside wall, gets dirty, that from dirty air blowing through
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Old 11-07-2019, 09:33 AM   #12
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Re: Bedroom wall options


Copy that! Thanks guys for the info.
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