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Old 01-31-2010, 09:17 PM   #1
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adding insulation to inside of exterior walls


we live in New Jersey in a 50 yr old house. We have removed the old paneling in our family room which is built on a slab,( room is always cold) and are going to install drywall Th exterior walls have insulation, but i am sure we need to add to it. Its only about 2 inches (Owens Corning) and I have no idea what the R value is, and has a brown paper vapor barrier facing toward the room. From reading other posts on insulation, it seems that I add unfaced batts perpendicular to the existing insulation, but I am not sure what R value i should look for. Also I have one wall the backs onto an unheated storage room. That wall is now not insulated. It doesn't feel cold. Should I insulate it as well? Any advice would be really welcomed
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Old 01-31-2010, 09:30 PM   #2
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adding insulation to inside of exterior walls


R15 I think is the highest Rvalue on a 2x4 wall
R13 is what you will normally find

2" might only be R6/7

They do not have 2" batts
You would need to take out what is there & add new
Or take out the existing batts & use 2 of those batts in each stud bay
Then buy more to fill the empty bays

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Old 01-31-2010, 10:01 PM   #3
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adding insulation to inside of exterior walls


"we live in New Jersey in a 50 yr old house." -------- R-13 is suggested for zip 070, in exterior walls.

"Its only about 2 inches (Owens Corning) and I have no idea what the R value is," ---- may be rock wool, 2" thick - R-value of 5.

"it seems that I add unfaced batts perpendicular to the existing insulation" ---- NO, only in attics- perpendicular.

Don't use two of the existing batts in a bay with both vapor retarder papers on, as suggested. Leave the front v.r. only: http://www.ornl.gov/sci/roofs+walls/...on/ins_06.html Air seal while the bays are empty.

" Should I insulate it as well?" ----- YES.

Be safe, Gary
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Old 02-01-2010, 07:38 PM   #4
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adding insulation to inside of exterior walls


I would remove all the insulation have the walls spray foamed (closed cellular is R7 to R8/Inch). Min code in the northeast is R19 but its at least better than what you have.

Are the studs 2x4? If so put in new stuff
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Old 02-01-2010, 08:18 PM   #5
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adding insulation to inside of exterior walls


thanks for the help consensus seems to be that i remove the existing insulation and add the largest R value i can get into the space.
thanks again
daryl
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