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.
Insulating garage walls with foam board.
Eps is used under roofing over foundation walls and beneath siding.
This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses.
Smaller and more manageable 2 foot by 8 foot and 4 foot by 4 foot sheets can sometimes be purchased as well.
Rigid foam board insulation comes in up to 4 foot by 8 foot sheets to help you rapidly cover expansive walls.
You can buy large quantities that work great for attics or a small can of spray foam that work great at sealing the flow of air around windows or doors.
The most obvious reason for installing rigid board insulation in your garage is the heating and cooling efficiency gained by using it.
Rigid foam board sizes.
Available in large three by five or four by eight sizes the panels.
This type of insulation is available in different forms.
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.
4 insulating foam sealant.
Although foam board insulation can be used in almost any part of a home this material is particularly well suited for a garage space where exposed walls and ceilings need insulation with ease of installation.