Renovation guide · Planning
Renovating in an Ottawa winter
Most indoor work doesn’t care what month it is. It cares about the temperature and humidity of the room it’s done in, and in an Ottawa winter those take some managing.
5 min readUpdated By SS Carpentry and Renovations
Key takeaways
- Indoor renovation goes ahead in winter when the space is heated: makers set temperatures, not seasons.
- Tile and grout need 10 °C at the surface as well as in the air, drywall compound 13 °C, and interior paint 10 to 32 °C.
- Wood floors need the heating running at 16 to 27 °C with 30 to 55% humidity, during installation and for good. Dry winter air is the risk.
- Winter is the season for a radon test: Health Canada’s method needs 91 days of the heating season.
Can you renovate in winter?
Indoors, yes. The makers of the materials that go into a renovation don’t write seasons into their instructions; they write temperatures and humidity. A heated house in January can meet them. What changes in winter is how much attention the room needs while the work goes on and while it cures.
That covers most of what happens inside: a kitchen or bathroom, new floors and tile, drywall and paint. The rest of this guide is about the conditions each of those needs.
What temperature do materials need?
| Material | Needs | Maker |
|---|---|---|
| Tile adhesive and grout | 10 °C and up, in the air and at the surface | MAPEI |
| Drywall joint compound | 13 °C and up, with ventilation | USG |
| Interior paint | 10 to 32 °C | Benjamin Moore |
| Wood flooring | 16 to 27 °C (60 to 80 °F) and 30 to 55% humidity, during installation and after | Hallmark Floors |
- A: Tile adhesive and grout: 10 °C and up, in the air and at the floor or wall
- B: Drywall joint compound: 13 °C and up
- C: Interior paint: 10 to 32 °C
- D: Wood flooring: 16 to 27 °C (60 to 80 °F), with 30 to 55% humidity, during installation and after
- E: Freezing: water in fresh mortar or grout must not freeze
Two details matter more in winter than the numbers suggest. First, MAPEI asks for the surface temperature as well as the air: a floor or wall can be colder than the room around it. Second, fresh mortar and grout still hold water. If that water freezes, it expands, weakens the installation and stops it curing properly. Below 10 °C, setting materials cure more slowly, and more slowly still as it nears freezing.
Why is winter hard on wood floors?
Because heated winter air is dry, and wood follows the air around it. One wood flooring maker puts it plainly: in very cold winters, heated indoor air loses its moisture and dries out wood, in floors, cabinets, doors and trim alike. Its instructions ask for the heating to be running at 60 to 80 °F (16 to 27 °C) with 30 to 55% humidity before the floor goes in, while it goes in, and for the life of the floor.
The same maker names whole-house humidification as the most efficient way to prevent that damage. Health Canada’s range for the home, 30 to 50%, sits inside the flooring range, so aiming for between 30% and 50% suits both the floor and the people in the house.
Vinyl asks for time too: one rigid-core maker requires 48 hours of acclimation in the heated room where it will be laid. For floors below ground level, where moisture comes from the slab rather than the air, see how to choose basement flooring.
What changes when you live there through it?
With the windows shut, a few things need more thought than they would in June:
- Moisture from drywall work. Joint compound releases water as it dries, and USG calls for adequate ventilation to carry it away.
- Heaters that burn fuel. If temporary heat is needed, its exhaust has to be vented.
- Humidity. Keep it between 30% and 50%, as Health Canada recommends, with a dehumidifier in a damp basement or a humidifier when the air gets too dry.
How should you plan a winter project?
Plan the work around the conditions above rather than the calendar. A winter start is planned the same way as any other, from estimate and design to permits and time on site; how long each stage of a renovation takes sets out that sequence.
- Ask which rooms will be worked in, and whether each can hold the temperatures in the table while the work goes on and while it cures.
- For wood floors, check that the heating and humidity are where the maker wants them before the boxes are opened, not after.
- Keep a hygrometer in the room. It’s the easiest way to see the 30 to 50% target.
Indoor work is what a winter is good for, and it’s most of the home renovation projects we take on across Ottawa.
Guidance only. Each product’s data sheet sets the conditions its installation and warranty depend on; check the one for the product you’re using.