Most insulating materials are available in several common forms-loose-fill or spray-applied materials, blanket rolls, batts, boards and foil-faced paper, foam, film and cardboard. Each form is ideal for specific insulating jobs.
The type of insulation material you select for any job depends on how you intend to use it, how much you want to spend, and how easy it is to install.
The chart below provides a summary of the qualities and suggested uses for the basic types of insulation.
Study the chart carefully. Consider the advantages, disadvantages and instructions for using each type of material as outlined in the chart. This table should help you select the correct material for any insulation job.
Blanket and batt insulation is usually made from fiber glass or rock wool. It is sized to fit between studs, floor joists and ceiling joists. It comes both faced and unfaced. Faced means the batt or blanket has a cover such as paper or foil on one side. Unfaced means there is no cover. Some batts and blankets now come with a protective covering that reduces the ‘itchy feeling’ you get when you work with insulation.
Rigid foam insulation is widely used on basement walls and on exterior walls. If rigid foam is used inside, it must be covered with gypsum board or other building code-approved material for fire safety reasons. When it is applied on the outside, it must be covered with a weatherproof facing. When using a foil-covered rigid foam, the foil must be away from the heated side of the wall to avoid a condensation problem.