The lower 2/3 of my house is brick vaner. It is uninsulated and
unwraped. I am considering two possibilities.
1. Use electric chisil and remove top and bottom bricks from each
cavity and blow in fiberglass. And replace with a contrasting brick.
2. Remove inside drywall (I can do drywall finishing) and put in
vaporgard and then using metal stays install R-13 fiberglass and re
sheet rock. I plan on doing complete re painting at the same time as
What would be the most cost effective in the long run?
#2 is the correct way, but the vapor barrier goes to the inside. Unless you
need to re-rock anyway, you can also inject foam in each stud cavity from
the inside, and just patch those holes.
I think you are mistaken about #1- if it is brick veneer, there is
SOMETHING (probably celotex, plywood, or plank) between the brick and the
studs. You DON'T want to fill up the space between the brick and the
sheathing- brick is not waterproof, and the water in that space needs to be
able to drain. Look at bottom course of brick- there should be weep holes,
usually in the vertical mortar joints, every few feet. And while house may
not have a modern vapor barrier, I'll bet there is 15 pound felt betwen the
brick ties and the sheathing, which does make a pretty good water block,
unless it is torn or rotted. Again, you don't want to puncture that barrier
to get into the stud spaces. (Blowing insulation through masonary wall CAN
be done, but it is a real PITA to do right. Almost always cheaper/easier to
go through interior walls and patch them.)
I'd open 1 stud cavity from inside (like inside a closet that butts up to
outside wall), and find out what is REALLY going on, before I made expensive
decisions. If you can followup with what year house was built, and what part
of country, the folks on here can make a pretty educated guess as to what
the wall construction details are.
The cavity behind the brick is only 1" max, and should be left
vacant, while the wall cavity is 3.5", allowing for more
insulation. You could drill 2" holes and blow in loose fill,
rather than take down the sheetrock.
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