The easiest and cheapest area is to add insulation on your garage door.
How to insulate a garage roof cheaply.
To prepare determine the area of the space you plan to insulate and add 10 to 20 percent to account for mistakes and odd spaces you need to fill.
Insulate garage doors where possible as well as walls and ceilings.
So before insulating go around the garage with a can of low expanding spray foam and seal all gaps and cracks that let in the daylight.
If you didn t do that before you put the frame up you can still do it now although it s going to be.
This will help while you re up on the ladder.
There are different garage ceiling insulating materials you can use but fiberglass is the most widely available.
Either way you go this diy project should only take a few hours to complete and will save you thousands of dollars over the course of its lifetime.
If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder.
This is part 1.
You can buy different types of insulation or buy a garage door insulation kit that has everything you need.
Last chance to waterproof your wall.
It is strong cheap and adjustable.
Here s my step by step process for how i added insulation to my garage.
Start putting the pads into place and use a high strength staple gun to secure them into position.
You can insulate the walls ceiling and door of the garage to the highest r value possible but if you fail to fill those air gaps you ll still be wasting a lot of heat.
How to insulate a garage step by step.
However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof.
I wrote a tutorial on how to waterproof and seal your garage walls using drylok.
Measure the height and width between the framing in the ceiling and pre cut the pieces you ll need.
Regulate your garage s temperature all year by installing insulation.
Before you invest in a garage heating system make sure your garage has plenty of insulation.
Fiberglass roll insulation fiberglass roll insulation is the cheapest and easiest type to install provided that your garage s interior walls have not been constructed.
Insulating the ceiling of your garage involves the same process as insulating the walls.
Just remember to use thicker r 40 insulation.
Be sure to count the spaces above doors and windows.
You can easily and inexpensively add clear plastic shrink film over windows for added protection against the cold.
Overlap and adjust the size of each pad as you go.