In many older homes, particularly those built before the 1990s, asbestos fibres may be found in building products such as vermiculite insulation, asbestos cement board siding, asbestos pipe insulation, drywall joint compound, stucco, and some older window putties. Even newer homes may contain asbestos in some components. Undisturbed materials within walls or attic spaces pose little risk to occupant health. However, if exposed or disturbed as part of a weatherization program these materials can cause health risks to both the contractor and occupants. At minimum, contractors and homeowners should consult the following publications prior to undertaking weatherization work: It's Your Health-Vermiculite Insulation Containing Amphibole Asbestos, published by Health Canada; Asbestos Hazards When Renovating Older Homes and Safe Work Practices for Handling Asbestos, both published by WorkSafeBC and available at www.worksafebc.com.