Insulation Calculator

How much insulation do you need for your project? If you don't know the total square footage of the area to be insulated, click on the calculator icon that will appear after you choose your state and county from the drop-down menus and insert the area dimensions in the appropriate boxes. If you know the total square footage, simply insert the number here. Either way, the calculator will take it from there.

Attic: The attic is the most important area of the house to insulate, and usually the easiest – especially when using loose-fill fiberglass. If you can see the floor joists, you need more insulation.

Wood Frame Wall:  Adding Insulation to exterior walls helps save energy and control moisture. Insulation in interior walls reduces both airborne and impact noise in the home.

Mass Wall: Insulating Mass Walls (Concrete, cinder block) helps improve a home's thermal performance. Add studs or furring strips first, then place insulation between them prior to finishing with drywall.

Floor: Insulating floors over unfinished basements makes living spaces more comfortable. Use faced insulation to limit moisture transfer; for finished basements with a vapor retarder already in place, use unfaced insulation.

Basement Wall: Insulating walls helps turn basements into warm, comfortable living spaces. Insulation with an integral vapor retarder is the best choice for unfinished concrete or cinder block walls (always check local codes).

Crawlspace Wall: Don't forget crawlspace walls when insulating the basement. See Mass Wall and Basement Wall above for information that will generally apply to crawlspace walls as well.

Vapor Retarder: Moisture in wall cavities can result in mold, mildew and damage to structural framing. A vapor retarder is essential in most areas of the country, and should always be placed toward the interior of the house.