Step lightly—there may be energy loss underfoot. Specifically, you may be
losing heat
out the edges of your slab foundation. More than half of the typical home's energy loss
is through the outer walls, floor, and roof (collectively known as your home's envelope...or
crust, for you toast-lovers).
Sealing leaks and adding
insulation
to your home's envelope
can make
home heating much more efficient and is vital to reducing energy losses. How vital?
The DOE says you can save up to 20 percent on your energy bill by adding insulation to your
slab foundation. Insulating foundation can also prevent cold feet, literally if not
matrimonially.
You can insulate your slab foundation yourself, or hire a pro to apply R-5 rigid foam
insulation to the outer edge of your slab foundation. R-values measure how well a material
stops heat flow, the higher the better. If you live in a colder climate, you may need insulation
with an R-value between 6 and 10. If you go with a contractor, make sure you compare bids for
the same insulating value (R-value) to the same foundation depth.
1. If you're planning to add
insulation to the edge of your foundation yourself, first evaluate outside foundation walls
for dampness. Then measure your foundation walls' square footage, height, and width.
2. Go to a hardware store and ask a sales assistant for
advice on which insulation is appropriate for your region and your slab foundation. Buy
enough insulation to create a two-foot depth on your slab foundation.
3. Follow the instructions that came with your
insulation—they'll vary based on insulation type. Make sure you use the adhesive specified
by the manufacturer.
Address drainage problems. As part of the insulation project, be sure to address any exterior drainage problems.
Fill openings with caulk. If you see
any openings around windows or pipes,
fill them with caulk before adding insulation.
Fight termites. Termites (motto: "We'll
destroy you") can make their way through exterior slab insulation to your home's wood frame. Help
prevent this by using rigid fiberglass materials and termite-resistant insulation, and making sure
moisture around insulation is controlled.
About insulation with foil or paper facing.
If your insulation has a foil or paper facing, be sure to cover it with finished wallboard
or drywall to prevent fire hazards.