In regards to insulating inside
concrete block walls, the best solution is to attach wood framed stud walls, or
furring strips, up against the concrete block walls, and then adding insulation
in-between the stud bays, or furring strips. If you create standard 2x4 walls
you can install an R-11 (3.5” thick) insulation in-between the stud bays. If you
use 2x4s attached to the concrete block walls on their flat side, known as
attaching furring strips, you can install rigid foam insulation with R-values
between R-4 and R-8.
Before installing any framing walls
or insulation up against the concrete basement walls, however, you should first
attach a vapor barrier to the concrete block walls. Make sure to tape all of the
seams. This will help to reduce moisture from permeating inwards from the
concrete block walls onto the insulation.
If you choose to create framed stud
walls, the walls should be constructed using pressure treated 2x4 lumber for the
bottom plate, and standard kiln dried 2x4 lumber for the top plate and vertical
stud members. The vertical stud members should be placed on 16 inch centers. The
framed stud walls should be nailed and glued (e.g. Liquid Nails) to the concrete
basement floor, as well as nailed to the first level floor joists.
If you attach 2x4’s on their flat
side up against the concrete block walls, fasten them to the walls with
Tapcon anchors or a powder actuated nail, and some liquid nails. The furring
strips should be placed on 16 inch centers.
Once you have installed either
the stud walls or furring strips you can then insulate the concrete block
walls. Insulation is available that will fit between the 16” wall studs and
or furring strips. Simply measure the height of the concrete wall bays, and
then cut and place the insulation up against the concrete walls. Staple the
R-11 rolled or batt insulation to the walls studs, or in the case of rigid
foam insulation use Liquid Nails or some other adhesive on the back of the
rigid foam insulation. In addition seal the rigid foam insulation seams with
When insulating concrete basement
walls on the inside, and using Rolled or Batt R-11 insulation make sure you
use a faced insulation that faces the interior of the basement. If you use
an unfaced insulation then you will need to add an additional sheet of
plastic over the entire framed and insulated wall to act as a moisture
barrier / vapor retarder.
An alternative technique for
insulating concrete block walls, is to first install rigid foam insulation
up against the concrete block walls (after installing the vapor barrier) and
then build the 2x4 walls. You can then add additional rolled or batt
insulation in the 2x4 walls to create an even higher R-Value for the
concrete block walls.
By following these simple
insulation techniques you should be able to create a drier and warmer
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