Garage drywall in Ottawa.

The Ontario Building Code requires the walls and ceiling between an attached garage and the dwelling to be gas-tight, and rooms above a garage need particular attention. Exact board type and details depend on the house, so confirm requirements with the City of Ottawa where a permit applies.

Every joint, outlet box and pipe penetration in that separation must be sealed — a gap defeats the barrier.

See also: Fire-rated drywall · Ontario Building Code (Government of Ontario)

A garage ceiling with living space above is the most important surface in the garage. It is boarded continuously, taped and sealed, with attic hatches and light boxes detailed so they do not leave openings.

See also: Ceiling drywall

Joint compound does not cure properly in freezing temperatures. In winter, an unheated garage needs temporary heat during taping and drying, which is discussed when the work is scheduled.

See also: Taping and mudding

Many garages only need fire-taping, where joints are taped and sealed but not fully finished. A garage used as a workshop, gym or living space can be finished to a paint-ready level like the rest of the house.

See also: Drywall finishing · Drywall installation