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To insulate interior concrete
basement walls many builders start by attaching a vapor retarder, a.k.a. vapor
barrier, to the concrete basement walls. If you prefer to attach a vapor
retarder directly to the concrete basement walls, make sure to use duct tape on
the seams to create a tightly sealed vapor barrier.
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Once you've installed the vapor
barrier, you essentially have one of three paths that you can go down for
insulating concrete basement walls. One path is to first install rigid foam insulation up
against the concrete basement walls, and then build 2x4 stud walls up against
the rigid foam insulation. This way you can then install additional R-11 rolled
or batt insulation (3.5” thick) in the wall stud bays to create effectively two
layers of insulation. Most 1” rigid foam insulation has an R-Value between R-4
and R-8. Add this to the R-11 rolled or batt insulation and you have a total
R-Value level of R15 to R19. |
Another path you can go down is
to simply frame up the wall studs directly up against the basement walls,
forgoing the rigid foam insulation. You can then install R-11 insulation
in-between the vertical wall studs.
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Finally, you can attach furring
strips directly to the concrete basement walls and then insert rigid foam
insulation in-between the furring strips. The furring strips are essentially
2x4 wall studs positioned on their flat side and fastened to the concrete
basement walls. You can attach the furring strips to the walls using a hammer
drill and Tapcon anchors. In addition, you may want to use a bead of Liquid
Nails on the back of the furring strips for a better hold. However, there is no
point in using Liquid Nails if you choose to attach a vapor barrier up against
the concrete basement walls.
When insulating concrete basement
walls it is very important to add a vapor retarder over the insulation and
framing stud walls or furring strip. If, you chose to use a faced insulation
between the wall studs you do not need to add the additional sheet of plastic to
form the vapor retarder. The faced paper is the vapor retarder. Just remember
thought to have the face side (paper side) of the rolled insulation facing
inwards toward the basement.
Whether insulating concrete basement walls, or any other space in your home with
fiberglass insulation, make sure to where full body clothes protection as well
as a mask, gloves and goggles. Fiberglass insulation is irritating to the eyes,
throat and skin.
For more help on Finishing
Basements, see HomeAdditionPlus.com's
Basement Remodeling Bid sheet. The
Basement Remodeling Bid Sheet will help
ensure that your hire the right contractor so that your basement remodeling
project is done
correctly and you get the project finished on time and budget.
How to Finance your Basement Remodeling Project -
can help provide funds for your new home improvement project if financing is
required.
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