I have removed the plaster and lathe on an exterior wall to discover
that they backplastered as well. The cavity is only 1-1/2" thick in
some areas. Can I fiberglass type insulation to this area?
I have insulation that is for a 3-1/2" wall...can I use this without a
problem?

compreessing the insulation cuts its r value.....

you can split the insulation by pulling it apart.

not certabout back plaster i would open the wall and install full
insulation or look into foam in place for higher r value

On 2006-09-28, wrote:

compreessing the insulation cuts its r value.....

you can split the insulation by pulling it apart.

For a given amount of insulation, compressing it reduces its R-value.
But for a given amount of space, filling it with compressed insulation
gives a higher R-value.

So to the OP, go ahead and compress your fiberglass insulation. You
might get R-4/inch, instead of R-3.5/inch, but that's still only R-6
for a 1.5" cavity. You might consider a better insulation than
fiberglass.

Cheers, Wayne

fiberglass is better than nothing, but if you can get something with a
higher r-value per inch, it may be better than the fiberglass.

Empresser #124457


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wrote:
I have removed the plaster and lathe on an exterior wall to discover
that they backplastered as well. The cavity is only 1-1/2" thick in
some areas. Can I fiberglass type insulation to this area?
I have insulation that is for a 3-1/2" wall...can I use this without a
problem?