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Roofs and Attics
When you think of adding insulation, the attic is the first place that generally comes to mind. Relatively easy access and few obstructions have made the attic a favourite starting point for many homeowners, despite the fact that most other areas – such as basements and uninsulated walls – lose more heat than the typical attic.
Adding more insulation is only half the battle. Even if an attic is already insulated, there may still be an opportunity to improve the energy efficiency and soundness of the house through air sealing. Air leaks into the attic through the many cracks and penetrations can account for substantial heat loss and can lead to a variety of moisture-related problems. The importance of air sealing cannot be overstated.
There are a number of methods for insulating and air sealing, depending on the type of attic:
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Warning: Be especially careful when working in areas that may contain vermiculite. Some vermiculite insulation may contain asbestos fibres. From the 1920s to 1990, a vermiculite ore produced by the Libby Mine in Montana (USA) may have contained asbestos. It was sold in Canada as Zonolite® Attic Insulation and possibly as other brands. Not all vermiculite insulation produced before 1990 contains asbestos fibres. However, to be safe in the absence of evidence to the contrary, it is reasonable to assume that if your home has older vermiculite insulation, it may contain some asbestos.
If vermiculite is contained in walls or attic spaces and is not disturbed, it poses very little risk to occupant health. However, if it is exposed or disturbed (as it might be during a renovation), it can cause health risks. Asbestos inhalation is associated with asbestosis, lung cancer and mesothelioma.
If you find older vermiculite insulation in your home, do not disturb it and consult the free Health Canada publication "It's Your Health – Vermiculite Insulation Containing Asbestos ." To order a free copy, call 1 800 443-0395.
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