Foam Board Insulation Garage Ceiling

I hate to burst your bubble but most building codes require a minimum of a one hour fire resistance wall and ceiling covering in a residential garage if the garage is part of the house.

Foam board insulation garage ceiling.

R matte rmax r matte plus 3 1 2 in. 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. Rigid foam insulation also known as insulating boards provide high r values. You may need to cover all of that foam insulation with fire code 5 8 inch plasterboard to meet those code requirements.

0 78 in x 8 ft x 4 ft. Rigid boards are manufactured from either. Regular ceilings are likely to be under attics with either batt insulation between the joist bays or in some cases rigid insulation between the rafters. The most obvious reason for installing rigid board insulation in your garage is the heating and cooling efficiency gained by using it.

Types of insulating boards choose from three types of insulating foam core boards for wall insulation. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Measure the height and width between the framing in the ceiling and pre cut the pieces you ll need.

Insulating the ceiling of your garage involves the same process as insulating the walls. If it isn t you don t want to insulate. 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. Eps is used under roofing over foundation walls and beneath siding.

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. They keep your home at a comfortable temperature without the need to crank your heat. But if the garage is heated you should definitely insulate. Doing so can cause mildew.

You can even place it under the foundation slab. Just remember to use thicker r 40 insulation. R 3 2 polyisocyanurate rigid foam insulation board.