You probably don’t give much thought to garage insulation. Homeowners usually keep their attics and walls insulated to save money on energy costs. But, since garages are unconditioned spaces, not heated or cooled, it does not makes sense to insulate them.
Is that really so? An uninsulated garage can become as hot or cold as it is outside. Within the garage it isn’t a problem, but if your home shares uninsulated walls and a ceiling with the garage, then it is a problem. And fumes from the car, paints, fertilizers, and other thing can easily enter your home.
Know that the best way to keep fumes from entering your home from the garage is to insulate the walls and ceiling that is shared between the garage and the house. Choosing the right kind of insulation can be a big difference.
Batt insulation is the most popular choice. But you should be aware that it’s not the best option for garages even if its R-values (the rating of insulation performance) are comparable to that of other insulating materials’.
With batt insulation, the material is installed in rolls (or batts). The batts do not seal spaces between the wall and ceiling and gaps can form between insulation rolls. The gaps allow energy to escape from your home and fumes to enter. Batt insulation is also susceptible to damage from moisture, further reducing its insulating ability.
Foam-board insulation, solid sheets of molded polystyrene, offers similar R-values as batt insulation, but is less bulky. But foam-board insulation cannot fill all the gaps in your wall, and spaces can also form between the sheets of insulation.
For less energy loss and fume seepage, get insulation that can fill every gap with a tight seal. This would mean getting spray foam insulation. It ahs the same R-values as with foam-board insulation, and it’s resistant to moisture damage.
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