I have been framing my basement over the past couple of months and have
concrete poured walls. I have left a 1/4 inch gap between the concrete and
framing for moisture. If I read you posting correctly your walls are already
insulated and you want to frame up against them. I would add a 6mil layer
of plastic to the foil face and then frame up the walls leaving a 1/4" gap
Good luck !!
Apparently I'm not being clear enough.
I don't want to frame out the walls. I don't want to lose floor
space. I'd rather just fur out the wall with 2x4's laid flat against
the existing wall, then use either plywood, drywall, paneling, or
pegboard to cover.
The question then becomes how to handle the situation with the
existing insulation. This stuff wraps around the room horizontally
with (2) 4' wide bats.
So, do I
1. Leave it, and place the furring strip 2x4's over it?
2. Cut it wherever there will be a furring strip, then re-staple or
tape it to the furring strip?
3. Rip it down toss it out, and re-insulate using 1.5" x 24" x 8' foam
board between my furring strips.
4. Open to suggestions???
I choose #3 because the wall will be more secure, better insulated,
Is there no way that you can keep yourself from using this newsgroup as a
place to vent on religion? Wrong place, wrong time.
Jim in NC
It depends on how much performance you want from your
insulation. A 1.5 inch space isn't much thickness for
fiberglass, particularly when it is over compressed. You
also need to consider moisture. Will you need a moisture
barrier at the concrete surface now that you are going to
seal off the concrete with a drywall or whatever?
If you don't care much about insulation, try fastening a
couple of 2x4s to the wall over the insulation and see if
that gives you a secure enough base. It won't have much
worse insulating properties than the already poor 1.5 inches
of bats. You could slice the insulation adjacent to the
studs and fluff it a bit to help fill the cavity. That would
still be less work than taking it down, or pre cutting.
If you care about insulation, the foam is definitely the way
Typical fiberglass bat material would give you an R value of
about 4.5 in a 1.5 inch cavity if the bat were made for a
1.5 inch space. If it were a thicker bat compressed to fit a
1.5 inch space, R value would be worse. You would probably
be doing good to get an installed R value of 3.
1.5 inch expanded polystyrene beadboard insulation would
give you and R value of about 6. Real world tests show that
foam board gives closer to rated results in typical
For covering think about fire resistance. 5/8 drywall would
give you good fire resistance and more strength than 1/2
drywall at a small increase in cost. 1/2 inch or thicker
plywood wouldn't be bad. Regular panelling is neither
durable nor fire resistant.
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