Step 2: Start with insulation
Your insulation needs will differ between interior and exterior walls. The rule of thumb is to treat the garage as interior space by fully insulating the exterior walls and leaving the separating wall between the garage and the home uninsulated. However, if you have a detached garage with a block wall you have a few options. You could:
- build out the frame and continue insulating with ROCKWOOL Comfortbatt®, or
- insulate with ROCKWOOL Comfortboard using appropriate fasteners which can provide you with a semi-finished look by leaving the rigid insulation exposed, or
- cover it with drywall for a finished look.
You might also wonder about insulating the pitch of the roof versus the rafters. What’s the best option? It all depends on what you want to do with the space. Insulating the rafters allows you to easily use the attic space as storage. And it can better control moisture to help prevent what you do store in that space from becoming damaged. However, if you had a living space above the garage, you would insulate with ROCKWOOL Safe’n’Sound® for continued fire resistance and to control sound for a more pleasant indoor experience for occupants.
Next, select the right product for your needs; most will find Comfortbatt® is an ideal choice (R14 in Canada or R13 or R15 in the US), assuming 2 x 4 wood studs, but Comfortbatt® comes in a range of R-values and thicknesses, depending on your location, the level of thermal resistance you want to achieve and the size of your studs, joists or rafters.
Regardless of the R-value and thickness, there are many benefits to using ROCKWOOL® Comfortbatt® in your garage. The thermal stone wool insulation is ideal for use in exterior walls, attics, and basements and provides consistent, comfortable indoor temperatures and energy savings throughout the year. On top of that:
- Comfortbatt® offers excellent thermal performance
- It is easy to install and simple to cut with a serrated blade to achieve an optimal fit around electrical wiring boxes, and pipes, and between studs and joists that are not standard width
- Friction fit compresses on install then springs back to fill the stud completely to prevent gaps
- It is dimensionally stable—it will stay firmly in place to provide energy savings over the life of the space
- It is noncombustible, resisting fire up to 1,177˚C or 2,150˚F
- It is water and moisture resistant; in a garage this is particularly useful as it is resistant to mold and mildew