House Energy Site

Insulation is critical for energy savings and home comfort

High levels of thermal insulation can save you hundreds of dollars per year.

Home insulation is a great investment and, ultimately, a critical factor to prevent climate change.

thermal insulation

infographic house energyMore Animated infographics that you may use freely:

See a list here: List of Energy & Infographics

Super-Insulated Homes

In cold climates, consider very high levels of insulation all over the envelope of the house. The super-insulation approach is critical in cold climates..

In other climates consider very high levels of attic or roof insulation and moderate or high levels of wall and floor insulation. Underfloor insulation may not be advantageous in hot climates..

New Homes & Insulation

Material InsulationWhich Insulation Materials Should you Use?

There are many insulation materials.

Fiberglass, cellulose, mineral wool and plastic foams such as expanded and extruded polyethylene, polyurethane sprays and rigid polysocyanurate are between the most important.

Insulation materials are not all alike. High dense rigid mineral wool, for instance, is a much better choice than fiberglass batts.

Insulation materials have different ratings (R-values) and choice depends largely on issues such as where they are going to be installed (open cavities, close cavities, surface of the walls, attics…), price, available space or moisture issues.

Home Insulation Materials
Guide to Insulation Fasteners

Levels of InsulationInsulation is Rated in R-Values and U-values

The insulation value of the different insulation materials varies and is measured by its R-value (thermal resistance) or its U-value (the inverse of the R-value).

A poor installation of the materials and thermal bridging can sharply reduce the effectiveness of the insulation.

Insulation is Rated in R-Values

Wall, Ceiling and Floor Insulation

The ideal insulation levels vary with the climate and the part of the house - attics, walls, floors and slabs.

Keep in mind: the amounts required by codes fall very short of the best.

Recommended Levels of Insulation

Exterior Wall Insulation
Retrofit Cavity Wall Insulation
Roof and Ceiling Insulation
Flat and Cathedral Ceiling Insulation
Attic Insulation
Attic Knee Wall Insulation

Inspect InsulationHow To Know Existing Insulation Levels?

How to know the insulation levels of your walls, or attics?

Energy audits can give you a very accurate answer, but you may also carry out some simple inspections.

Inspecting Existing Home Insulation
Energy audits

Insulate the Whole Envelope of the House

House EnvelopeHomes should be insulated all over their envelope (the red line, in the image at left) without gaps or interruptions. thermal bridging

Thermal bridging (image at right) should be avoided, by covering all possible bridges.

Framing materials can easily become conduits through which the heat escapes or enters.

See: Thermal bridging

Floor InsulationFloor & Slab Insulation

Floor insulation may not be advantageous in hot tropical climates. But in mixed and cold climates, underfloor insulation is also important.

Under-Floor Insulation
Concrete Slab Insulation
Insulation in Hot Tropical Climates

Ducts ClipPipes, Ducts and Tank Insulation

Ducts running in garages, basements, crawl-spaces and attics should be carefully insulated (and sealed).

Duct insulation
Hot Water Pipe insulation
Hot Water Tank Insulation

Insulation & Environment

From an energy-efficiency and environmental standpoint energy conservation is at least as important as energy generation.

In this sense, insulating our homes is as important as solar photovoltaics and wind and other green sources of energy.

Environment & Insulation

See also:
Insulated Garage Doors
Air Sealing & Insulation
Online Resources on Insulation


101 Ideas

About to build a new home?

Read our book (Print and Kindle ebook versions);
Save thousands of dollars;
Avoid costly mistakes and pitfalls.

HOUSE ENERGY BOOK, available on Amazon:
101 Ideas To Improve Your New Home: Home design, energy efficiency and green construction.


Our Video on Insulation:




Top .... Home Page