Check it out for more details and specific recommendations.
Benefits of insulating detached garage.
The benefits of insulating a garage door.
When you insulate a garage use insulation with the same rated r value as that used for your home s walls and ceiling.
Make your old detached garage into a more habitable place by adding insulation to help keep it cooler in the summer and warmer in the winter.
But the big benefit is to regulate the temperature.
Although there would still be plenty of benefits to adding insulation to the walls and ceiling without insulated doors and windows an hvac system wouldn t be as effective and humidity control won t be as good.
Homes with attached garages may see the most benefit from insulating the door but even detached garage spaces can benefit from being insulated especially in areas with extreme climates.
A detached insulated garage can serve as a place for storage and tools maybe even a small shop but that shouldn t detract from the main purpose of housing the family car.
Insulating the garage while insulating a garage won t make it substantially warmer unless you add a heater it will help to provide an additional insulated space for the home.
Depending on the type and location of your garage space an insulated garage door can provide many benefits.
If you plan on including insulation in your detached garage don t forget the garage doors entry door and windows.
But no state requires this as part of energy efficiency mandates and it.
You won t be working in a huge space unlike your main house an empty cold attic or a wide unfinished basement.
A properly insulated garage is a safety must.
I wrote a big article discussing whether you should insulate your garage.
There is a school of that maintains that an unheated garage that is attached to the house may get some benefit from insulating the walls and ceilings of the garage since it theoretically offers an additional thermal buffer between the exterior of the home and the outdoors.
You already know there are government agencies that require specific r value ratings for the ceilings in an attached garage but there are also other benefits of insulating and heating the space and if you have a detached garage the lack of rules doesn t mean there aren t any additional benefits.
Or as big as your lot allows.
Building a detached garage means you can make it as big as you want.
For me the bigger the better.
Adding insulation won t make your garage a perfect temperature by itself but it will take the edge off the freezing winters and the sweltering summers.
Whether you opt for spray foam blown in or fiberglass batts for your insulation it s likely you won t need a whole lot to fully insulate your entire detached garage.
When constructing insulating a detached garage it is usually a good idea to add enough space in the back for storage and tools.