Ceiling above an attached garage in Barrhaven has a hole, does it matter?

The hole matters, and here is why the ceiling between your garage and the house is different from any other ceiling in the home.

Ontario's Building Code (9.10.9.18.(4)) requires an air barrier system between an attached garage and the rest of the building, installed to provide an effective barrier to gas and exhaust fumes. That barrier must be continuous: joints in a panel-type air barrier are sealed (9.25.3.3.(1)), and penetrations such as electrical wiring, electrical boxes, piping or ductwork are sealed (9.25.3.3.(6)). A hole in the ceiling breaks that continuity. These are minimums for new work, and you should ask the City how they apply to your repair.

The Code does not require Type X drywall or a fire rating between a single home's attached garage and the house. What it requires is that the barrier be continuous and sealed. Many builders use taped and sealed drywall to form that gas barrier, so patching and sealing the hole is the repair that brings the ceiling back to what the Code calls for.

The door between the garage and the house also comes into this: Ontario's Building Code (9.10.13.15.(1)) requires it to be tight-fitting, weather-stripped and fitted with a self-closing device. If that door is not closing fully on its own, ask the contractor what they propose and how it meets 9.10.13.15.(1).

For the patch itself, the contractor needs to look at the hole to scope the work. Published GTA and Ontario contractor prices for small patches run about $150 to $600, but we found too few published figures for ceiling repairs in a garage-ceiling context to give a range that applies here. Ask the quote to state what board is used, how the edges and seams are sealed, what finish level is applied, and whether the work restores the continuity of the air barrier across the whole ceiling, not just the patch area.

If the house was built before 1990, Health Canada advises testing before anyone cuts or sands the existing ceiling material; a positive result means abatement work before the patch (ottawaabatement.com).

Before you agree to anything, ask the contractor exactly how they will seal the patch so that no gap remains between the new board and the existing ceiling.