Insulation and Envelope

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Adding insulation or repairing a building envelope provides great heating benefits.


Maximum Insulation Effectiveness

Use higher density insulation, such as rigid foam boards, in cathedral ceilings and on exterior walls.


Ventilation plays a large role in providing moisture control. Attic vents can be installed along the entire ceiling cavity to help ensure proper airflow from the soffit to the attic, helping to make a home more comfortable and energy efficient.

Recessed Lighting

Recessed light fixtures can be a major source of heat loss, but you need to be careful how close you place insulation next to a fixture unless it is marked “I.C.” – designed for direct insulation contact. Check your local building codes for recommendations.

Crawl Spaces

If your home has a crawl space, inspect it regularly to ensure that the insulation inside is dry. When insulation gets wet, its optimal effectiveness is significantly reduced. Be sure to find the source of the moisture and replace any damaged insulation.

Water Heater Insulation

Building Envelope

Dryer Vents

Fix Air Leaks in Walls and Around Windows

Window Plastic

Insulate Outlets

Install foam gaskets behind electric outlet and switch plate covers.

Materials and Key Concepts

Heating and Cooling Ducts

Aluminum tape wrapped around joints in heating and cooling ducts can help reduce costly air leakage.


Close chimney dampers. Warm air rises up and out open chimneys at an alarming rate. Close your damper as soon as you’re certain the fire is completely out.

Air leaks are common at the joint between the chimney and the wall. To seal them, remove the trim (if necessary) and apply heat-resistant caulking.