Department of Energy
Assistant Secretary
Energy Efficiency and Renewable Energy



  • Why Insulate Your House?
  • How Insulation Works

Which Kind of Insulation is Best?

  • What Is an R-Value?
  • Reading the Label
  • Insulation Product Types

Insulating a New House

  • Where and How Much
  • Air Sealing
  • Moisture Control and Ventilation
  • Installation Issues
    • Precautions
    • Attics
    • Walls
  • Design Options
    • Crawlspaces and Slabs
    • Advanced Wall Framing
    • Metal Framing
    • Insulating Concrete Forms
    • Massive Walls
    • Structural Insulated Panels
    • External Insulation Finish System
    • Attic Ventilation or a Cathedralized Attic

Adding Insulation to an Existing House

  • Where and How Much
  • How Much Insulation Do I Already Have?
  • Air Sealing
  • Moisture Control and Ventilation
  • Insulation Installation, the Retrofit Challenge
    • Precautions
    • Attics
    • Walls
    • Basement Walls
    • Floors and Crawlspaces

Resources and Links

About This Fact Sheet

Resources and Links

Additional and more detailed information about thermal insulation materials and installation and about energy conservation in buildings is available from the agencies and organizations listed below. Your public utility company may also provide information and assistance on home energy conservation practices and materials.

[Internet_Sites] [Computer_Program] [Manufacturer's_Associations] [Reference_Sources] [Other_Publications] [Guidelines_for_New_Home_Construction]

Internet Sites

Energy Star Programs supported by the Environmental Protection Agency and the Department of Energy. These programs include information about Energy Star new homes and home improvement,

Building Envelope Research topics, see

Building Technology Program Publications, see "Technology Fact Sheets"

Computer Programs

ZIP-Code Computer Program:
Operable version found on the internet at:

Home Energy Saver, a do-it-yourself energy audit tool produced by Lawrence Berkeley National Laboratory's Center for Building Science,

Reference Sources

U.S. Department of Energy
Energy Efficiency and Renewable Energy Program Office Home Page
A Consumer's Guide to Energy Efficiency and Renewable Energy in the Home
Tips for Energy Savers

Insulation Contractors Association of America (ICAA)
Phone: 703-739-0356

National Association of Home Builders (NAHB)
1201 15th Street NW
Washington, DC 20005
Phone: 202-266-8200 x0, 800-368-5242, Fax: 202-266-8400

NAHB Research Center, Inc.
400 Prince Georges Boulevard
Upper Marlboro, MD 20774
Phone: 800-638-8556

National Institute of Building Sciences
1090 Vermont Avenue, NW, Suite 700
Washington, DC 20005-4905
Phone: 202-289-7800, Fax: 202-289-1092

Other Publications

U.S. Department of Energy
Energy Efficiency and Renewable Energy Information Center

Office of Scientific and Technical Information (OSTI)
P.O. Box 62
Oak Ridge, TN 37831
Phone: 865-576-1188, Fax: 865-576-2865

U.S. Department of Housing and Urban Development
Washington, DC 20410-6000

Guidelines for New Home Construction

Building Standards and Guidelines Program (BSGP)

Other Building Code Links

ASHRAE STANDARD 90.2-2007 Energy-Efficient Design of New Low-Rise Residential Buildings
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
1791 Tullie Circle, NE
Atlanta, GA 30329

Thermal Design Guide for Exterior Walls
American Iron and Steel Institute

Manufacturer's Associations

Air Diffusion Council (ADC) (representing manufacturers of flexible air duct)
1901 N. Roselle Road, Suite 800
Schaumburg, Illinois 60195
Phone: 847-706-6750, Fax: 847-706-6751

American Iron and Steel Institute
1140 Connecticut Ave., NW, Suite 705
Washington, D.C. 20036
Phone: 202-452-7100

Cellulose Insulation Manufacturers Association (CIMA)
136 South Keowee Street
Dayton, OH 45402
Phone: 888-881-CIMA (881-2462) or 937-222-CIMA (222-2462), Fax: 937-222-5794

Center for the Polyurethanes Industry
American Chemistry Council
1300 Wilson Blvd., Arlington, VA 22209

Expanded Polystyrene (EPS) Molder's Association
1298 Cronson Boulevard, Suite 201
Crofton, MD 21114
Phone: 800-607-3772

Extruded Polystyrene Foam Association (XPSA)
4223 Dale Boulevard
Woodbridge, VA 22193
Phone: 703-730-0062, Fax: 703-583-5860

Home Ventilating Institute
1000 N. Rand Rd., Suite 214
Wauconda, IL 60084
Phone: 847-526-2010, Fax: 847-526-3993

Insulating Concrete Form Association
1730 Dewes Street, Suite #2
Glenview, IL 60025
Phone: 888-864-4232, Fax: 847-657-9728

North American Insulation Manufacturers Association (NAIMA)
44 Canal Center Plaza, Suite 310
Alexandria, VA 22314
Phone: 703-684-0084, Fax: 703-684-0427

Polyisocyanurate Insulation Manufacturers Association (PIMA)
7315 Wisconsin Avenue, Suite 400E
Washington, DC 20814
Phone: 301-654-0000, Fax: 301-951-8401

Reflective Insulation Manufacturers Association
4519 E. Lone Cactus Drive
Phoenix, AZ 85050
Phone: 800-279-4123, Fax: 480-513-4749

Society of the Plastics Industry, Inc.
1667 K St., NW, Suite 1000
Washington, DC 20006
Phone: 202-974-5200, Fax: 202-296-7005

Spray Polyurethane Foam Alliance
4400 Fair Lakes Court, Suite 105
Fairfax, VA 22033
Phone: 800-523-5154, Fax: 703-222-5816

Structural Insulated Panel Association (SIPA)
P.O. Box 1699
Gig Harbor, WA 98335
Phone: 253-858-7472, Fax: 253-858-0272

Previous Section - Adding Insulation to an Existing House

Building Envelope Research
Oak Ridge National Laboratory

For more information, contact the program manager for Building Envelope Research:

André O. Desjarlais
Oak Ridge National Laboratory
P. O. Box 2008, MS 6070
Oak Ridge, TN 37831-6070

E-mail Andre Desjarlais

This page updated on January 15, 2008.