"Super-insulating" shared garage/house wall
Last Post 20 Apr 2015 10:55 AM by BadgerBoilerMN. 2 Replies.
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strawmyersUser is Offline
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16 Apr 2015 03:19 PM
Just want to make sure I'm not creating any potential issues with this set-up:

I am building an attached garage onto the front of my house.  I have some 2" Type IX EPS leftover from another project.  The shared wall is 2x4 construction, originally with R-11 kraft faced batts and 1/2" of foil-faced poly-iso foam (no structural sheathing).  The room on the house side has a vaulted ceiling with site-built scissor trusses.  Because of the way these trusses extend into the wall space on the house side, there was a ~6" tall hole at the top of each cavity connecting the wall cavity to the attic... which I'm thinking doesn't do much for the R-value of the wall (air penetration).

First thing I did was cut pieces of 2" EPS and use them with canned spray foam to seal the wall cavities off from the attic space.  And also removed the mouse tunnel/poo/pee ridden R-11 batts and replaced with new R-13.

Then I squeezed a fat bead of foam adhesive on each stud/plate and secured the 2" foam, leaving a 1/2" gap between each sheet and filled that with spray foam for a good seal.


I then installed 1/2 drywall directly to the face of the EPS.
  This is also to function to some extent as a fire block, as it has no penetrations.

What I am planning to do tonight is build an additional 2x4 wall on the garage side 1/4" off of that drywall.  This is to house the electrical outlets.  My intention is to spray foam the perimeter of each cavity and install unfaced R-13 batts in this wall.  Any issues with that?  I don't think so since the batts with be unfaced; but it doesn't hurt to check.  The wall is getting built regardless; but I don't have to seal and insulate it if that will cause problems having the foam/drywall sandwiched between two FG walls (only the inner wall being faced, though).  Thanks!
strawmyersUser is Offline
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19 Apr 2015 01:38 PM
Did I stump the pros with this one?

BadgerBoilerMNUser is Offline
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20 Apr 2015 10:55 AM
I did this in my walkout basement wall. It worked.
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