Last week we encouraged everyone to insulate our homes before the weather gets too bad. It is the best way to reduce our utility bills and cut down on green house gas emissions. On average heating and cooling amount to about 43% of our energy use.
There are two common ways to reduce those costs by insulation — Fiberglass batt insulation and closed cell spray insulation. There are advantages and disadvantages to each.
Fiberglass is less expensive, but you need twice the thickness of fiberglass to get the same insulating value as spray insulation.
Fiberglass insulation can be put in place easier than closed cell spray insulation and, with a little care, can be a do-it-yourself project . It can be laid between the ceiling joists in the attic.
The foam insulation is a two part process where two chemicals are mixed and sprayed on with special equipment. There are do-it-yourself kits, but if it were me I’d hire a professional.
The foam insulation, when applied correctly, seals air leaks and is a vapor barrier. It can be applied under the roof sheathing leaving the attic space insulated and usable for an additional room. (Fiberglass insulation can be used to insulate between roof rafters rather than being laid between the ceiling joists, but it has only half the resistance to heat loss than spray.)
Six inches of spray insulation or 12 inches of fiberglass insulation will give us an R36 insulation value. Either way our energy savings will be noticeable and we can feel good about reducing green house gas emissions.
Find out about Atlanta’s SHINE rebate program.
Find out about Decatur’s Wise rebate program.