How do I choose a garage door for a Toronto winter?
Start with insulation. Doors are rated by R-value, which measures resistance to heat flow. Insulated steel doors filled with polyurethane foam are commonly sold in the range of R-12 to R-18. Doors with polystyrene panels are lower, and a plain single-layer steel door offers very little.
An insulated door matters most when the garage shares a wall with the house or sits below a bedroom. In an unheated detached garage, strength and dent resistance may matter more than the rating.
Also look at:
- Seals: a flexible bottom seal and tight side and top seals keep out snow and drafts.
- Material: steel, wood-look steel, wood, aluminum and glass, or fibreglass.
- Colour and windows: insulated glass helps in winter, and a colour that suits your brick or siding.
- Hardware: high-cycle springs and quality rollers last longer.

