However, if you use an unfaced
insulation you will need to add a plastic vapor barrier over the garage walls
after installing the insulation. If you used faced insulation the paper side
should face the interior of the garage.
Cut the rolled or batt insulation
into the appropriate lengths to fill the bays between the garage wall studs. Use
a utility knife and a length of 2x4 to cut the insulation.
If you are using a faced insulation
staple the paper face tabs to the wall studs. Apply staples every 12” or so
along the height of the bay.
Next install pieces of insulation
in-between window frames and wall studs and above and below the window and door
frames. Use a screwdriver or a putty knife to work the insulation into the
narrow spaces. Alternatively you can use a spray foam insulation that you can
find at any home improvement center. These types of insulation work great and
can typically do a better job getting into small narrow spaces.
Likewise make sure insulation is
fastened snuggly around all electrical boxes.
Insulating Garage Ceiling / Attic
Next install insulation between the
garage roof rafters, to insulate the garage ceiling. You should use a minimum of
R-30 insulation. However before installing the insulation it is best to first
install furring strips perpendicular to the roof rafters. The furring strips are
1”x3” lengths of lumber that are nailed on 16” centers perpendicular to the roof
rafters. The furring strips will hold the attic insulation in place and allow
drywall to be attached to the garage ceiling. Again, if you are using a faced
insulation on the garage ceiling make sure the paper faces towards the interior
of the garage.
Installing a Vapor Barrier
If you installed unfaced insulation
it is imperative to install a vapor barrier. The vapor barrier slows the
transfer of moisture from the warm moist room to the cold drier outside air. By
slowing this moisture transfer rate, condensation is prevented from occurring
inside the garage walls/ceiling. By preventing condensation the risk of rot,
mold and mildew are reduced.
To install a vapor barrier simply
install polyethylene plastic over the insulation. Staple the plastic to the wall
studs and/or furring strips. Make sure you overlap sections of plastic by at
least 6 inches, or one additional bay.
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