When it comes to choosing the best insulation, there are several factors to consider, including the climate, the type of construction, and the cost. Here are some of the most common types of insulation used in Canada:

1. Fiberglass: Fiberglass is a popular and cost-effective insulation material that is commonly used in Canadian homes. It is made from recycled glass and is available in batts or blown-in form. It is easy to install and has good insulating properties, but it can be itchy to handle and may not be the best choice for people with allergies.
2. Cellulose: Cellulose insulation is made from recycled paper and is blown into the wall cavities or attic. It has good insulating properties and is environmentally friendly, but it can be messy to install and may settle over time, reducing its effectiveness.
3. Spray foam: Spray foam insulation is made from polyurethane and is sprayed directly onto the walls or attic. It has excellent insulating properties and can help seal air leaks, making it a good choice for homes in colder climates. However, it can be more expensive than other types of insulation and should be installed by a professional.
4. Rockwool: Rockwool insulation is made from natural stone and is available in batts or blown-in form. It is fire-resistant and has good soundproofing properties, making it a good choice for homes near busy roads or airports.
5. Reflective insulation: Reflective insulation is made from foil or plastic and is installed in the attic or on the walls to reflect heat back into the home. It is less effective in colder climates but can be a good choice for homes in warmer regions of Canada.

Ultimately, the best insulation for Canada depends on a variety of factors, including the climate, the type of construction, and the budget. Consulting with a professional insulation contractor can help you determine the best type of insulation for your specific needs.