On 13 Dec 2006 13:33:05 -0800, "
wrote:

i have done this, you may find some blocks here and then requiring more
holes, repair all well with mortar or concrete.

do realize at home resale time they will probably not count these room
as finished spaces, no insulation block wall etc.

probably the major downside to your plan

Although, if you're punching holes in the blocks anyway,
you might as well dump some vermiculite in there which
will add something like R2 to the walls.