I feel I should know this, but obviously I don't. Framing out 3 block
walls in the garage so I can insulate (3rd wall is mostly undergrade and
not easily accessible at this time). Icynene is nice but I feel if I
take my time I can install fiberglass so it doesn't have all the
drawbacks of normal fiberglass insulation installations. OK, 2x4 wall
with 3 1/2" insulation. Most of it shouldn't touch the wall but I
suppose it could at places. The outside of this block wall is completly
exposed the inside does not get wet or damp. Does the wall get plastic
or a moisture barrier? And what if I run some foam in a can between
each 2x4 and the block wall? And maybe if I run a little horizontal
foam in the middle of each bay to prevent convection currents? Also
where to staple... may sound dumb but if the insulation vapor barrier is
stapled to the sides of the 2x4's, it will always have a little gap on
each side, again for convection currents. Stapling it on the face seems
like it would be better.
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