Engineered hardwood needs 48–72 hours in the room where it will be installed. Solid hardwood needs 5–7 days. These timelines exist because wood is hygroscopic — it absorbs and releases moisture continuously, expanding when it takes on humidity and contracting when it dries out. In a GTA home, where summer humidity routinely climbs above 60% and winter indoor air can drop below 30% relative humidity, skipping or shortening the acclimation window is the single most common cause of gaps, cupping, and squeaks in the first year after installation.
At Top Floorings Depot (3781 Victoria Park Ave, Toronto), we recommend erring on the side of more time, especially for homes with exposed brick, recently poured concrete, or that are still under HVAC commissioning. Here is what you need to know before your flooring arrives.
Why GTA Climate Makes Acclimation Non-Negotiable
Toronto and the surrounding GTA experiences some of the widest seasonal humidity swings of any major Canadian city. In July and August, outdoor relative humidity regularly sits at 70–85%. In January, heated indoor air can drop to 20–30% relative humidity. Solid hardwood — which is ¾" (19mm) solid wood throughout — will move noticeably in response to these shifts. An engineered hardwood with a multi-ply core is more dimensionally stable, but it still responds to the environment.
When hardwood absorbs moisture during a humid GTA summer, it expands. When it loses moisture in a dry winter, it contracts. If the floor was installed at the wrong moisture content — either too high or too low — that seasonal movement becomes visible as gaps between boards, cupping (where the edges of the board rise above the centre), or creaking and popping sounds underfoot.
Proper acclimation brings the wood to equilibrium with the room's normal living conditions before it is fastened down. Once in equilibrium, seasonal movement is minimized and the floor performs as expected.
How Long Does Each Flooring Type Need?
The acclimation timeline depends on the product construction. Here is what we tell customers at our showroom for the most common scenarios in GTA homes:
| Flooring Type | Recommended Acclimation | Key Condition |
|---|---|---|
| Solid Hardwood (¾") | 5–7 days minimum | Open boxes, lay flat in room |
| Engineered Hardwood | 48–72 hours minimum | Room at normal living conditions |
| Engineered over concrete | 72 hours minimum | Concrete moisture tested first |
| Laminate (click-lock) | 24–48 hours | Room at normal conditions |
| SPC / LVP Vinyl | 24–48 hours | Room at normal temperature |
Solid hardwood is the most sensitive because it is a single species throughout. Engineered hardwood has a multi-ply or HDF core that resists movement more effectively, which is why it requires less time on the job site. The 5–7 day window for solid hardwood is not arbitrary — it is the minimum time for the wood's core moisture content to stabilize within approximately 1–2% of the subfloor's moisture content.
For engineered hardwood installed over a concrete subfloor — common in Toronto condos and basements — we recommend a minimum of 72 hours and require that the concrete be tested with a moisture meter first. Concrete subfloors can hold residual moisture for months after a pour, and that moisture can migrate into the wood if the concrete has not fully cured and dried.
How to Know the Floor Is Ready
Time alone is not enough. Acclimation only works when the room conditions represent normal living conditions. Running the HVAC, keeping the thermostat at its normal daytime setting (ideally 68–72°F / 20–22°C), and ensuring the space is enclosed (interior doors closed, windows sealed) will give you the most accurate reading of what the floor will experience once installed.
Before the flooring arrives, run your furnace or central air as applicable for at least 48 hours. Do not acclimate hardwood in a gut-renovation site where drywall compound and paint are still curing — the excess moisture in the air will drive into the wood before the floor is even fastened down.
For solid hardwood, use a moisture meter to test a representative sample of boards before installation. For engineered hardwood, a moisture reading within 2% of the subfloor reading is considered acceptable. We use pin-type and pin-less meters at our showroom and can demonstrate the technique on request.
What Can Go Wrong When You Skip Acclimation
The consequences of installing hardwood before it has reached equilibrium manifest within weeks to months, and none of them are cheap to fix:
- Gapping: Boards shrink and pull apart at the seams, leaving visible gaps — particularly noticeable in the first winter after installation when indoor humidity drops. Gaps wider than a Canadian two-dollar coin (toonie) are not normal seasonal movement; they indicate the wood was installed too wet.
- Cupping: The edges of each board rise above its centre, creating a concave profile across the board width. This happens when the top of the board is drier than the bottom — often triggered by humid conditions in the home or water introduced during installation. Minor cupping can reverse as the floor equilibrates; severe cupping usually requires sanding and refinishing for solid hardwood.
- Squeaking and popping: When boards move independently of each other or the subfloor, they create friction sounds at the fastener points. This is most common with nail-down solid hardwood installed over a wooden subfloor that was not properly stapled or nailed to the joists.
- Buckling: In extreme cases — such as installing over a wet concrete slab or in a home that was not climate-controlled during installation — the floor can lift entirely off the subfloor and buckle. This requires a full tear-out and reinstallation.
For homeowners in Scarborough, North York, and Markham with older homes (pre-1990 housing stock), pay particular attention to the subfloor condition. Many older homes have plywood or OSB subfloors that were not installed to today's standards, and any bounce or flex in the subfloor transfers directly to the hardwood and amplifies movement.
Our Top Picks at Top Floorings Depot
If you are buying solid hardwood for a GTA installation, here are two of our most reliable options — both Canadian-made and stocked in our showroom on Victoria Park Avenue:
Appalachian Natural Red Oak — 4¼" Excel Grade
SKU: Appalachian Natural Red Oak 4¼" Excel
Price: $5.39/sqft
Spec: ¾" (19mm) thick, 4¼" wide, random length, semi-gloss finish. 18.9 sqft/box. Canadian-made in Quebec. The Excel grade offers a clean, consistent grain with fewer character markings than Prestige grade — ideal for modern, minimal interiors in Toronto condos and newer semis. This product requires a minimum 5-day acclimation period on site.
Appalachian Poplin White Oak — 4¼" Prestige Grade
SKU: Appalachian Poplin White Oak 4¼" Prestige
Price: $5.69/sqft
Spec: ¾" (19mm) thick, 4¼" wide, random length, Prestige grade (more character grain and natural colour variation). White Oak is harder than Red Oak on the Janka scale (1360 vs 1290), making it a better choice for high-traffic hallways and family rooms. Like all solid hardwood, it must be nail- or staple-down installed over a plywood subfloor and requires a minimum 5-day acclimation window.
For engineered hardwood alternatives that reduce the acclimation wait time, explore our engineered hardwood collection. Engineered products like our European Oak line — available in 6.5" and 7.5" widths with 2mm, 3mm, and 4mm wear layers — install faster over concrete subfloors and are more forgiving in Toronto's variable humidity conditions.
What to Do Before Your Flooring Arrives
Coordinate acclimation time with your installation crew at the start of the project, not the day before delivery. A typical installation sequence for a GTA home with solid hardwood:
- Confirm delivery date with your flooring supplier at least one week in advance
- Ensure HVAC has been running in the installation area for 48+ hours before flooring arrives
- Store the flooring in the room where it will be installed — not in a garage, basement, or covered porch
- Open all boxes and lay boards flat (do not lean them against walls)
- Maintain normal thermostat settings throughout the acclimation period
- Test the subfloor moisture content before installation begins
- Allow the full recommended acclimation window before scheduling the install crew
If you are hiring a contractor for the installation, confirm that they are aware of the acclimation requirements for the specific product you purchased. Some contractors working on tight timelines will pressure you to start before the floor is ready — hold firm. A one-week delay is far less expensive than a floor that cups or gaps in the first winter.
For questions about acclimation timelines for specific products in our inventory, or to book a moisture meter test at our showroom before your installation, call us at 416-499-0117 or visit us at 3781 Victoria Park Avenue, Unit 1, Toronto.
Visit Top Floorings Depot
Top Floorings Depot
3781 Victoria Park Avenue, Unit 1, Toronto, ON M1W 3K5
www.topfloorings.com
Call 416-499-0117 | Text 416-770-8819
Showroom Hours: Monday–Friday 9–5:30 | Saturday 9–4 | Sunday Closed
We serve homeowners and contractors across Toronto, Scarborough, North York, Markham, Richmond Hill, Vaughan, and the broader GTA. Visit our showroom to see our full hardwood flooring collection, get moisture meter readings on your subfloor, and speak with our team about proper installation timelines for your specific project.
Follow us on Instagram: @topflooringsdepotgta — we post completed installations from GTA homes every week.