Solid vs engineered hardwood in Ontario

Ontario is a humidity machine

Houses here go from about 20 percent indoor relative humidity in January to 60 percent in July if nobody runs a humidifier. Solid hardwood moves. Engineered hardwood moves less. That is physics, not a sales pitch. The wrong response is 'always engineered.' The right response is: what is under the floor, and how many times do you plan to sand it?

What the two things actually are

Solid is one piece of hardwood, typically 3/4 inch, that moves as a single body across its width. Engineered is a hardwood wear layer over a cross-laminated core, and the core's opposing grain directions are what resist that movement.

The number that matters on engineered is the wear layer, not the total thickness. A 4 mm wear layer can be sanded two or three times over a long life. A 2 mm layer can take one careful sand. A 0.6 mm photographic veneer cannot be sanded at all — that is a laminate with better lighting in the showroom.

Core quality matters nearly as much. A multi-ply birch or poplar core is a different product from an HDF core, particularly anywhere moisture is possible.

Choose solid when

You have a dry wood-framed subfloor above grade, you want a 3/4" wear life you can sand several times over decades, and you are willing to keep indoor humidity in a civilised range — ideally 35 to 55 percent. Forest Hill, High Park, the Kingsway, southeast Oakville wood-frame houses: this is still the correct luxury spec.

Solid also holds its value in a way engineered does not, because a buyer's inspector can see it is solid and knows it has life left. In the houses where that matters, it matters.

Choose engineered when

Concrete slab, below grade, hydronic radiant, or a condo. Also anywhere you want a plank wider than about 5 inches, because width multiplies seasonal movement and engineered is what makes wide plank behave.

Demand a real wear layer — 3 mm or more if you want a future refinish — and an adhesive or click system the mill will actually warrant for your assembly. Get the warranty language before you buy, not after.

The decision is usually made for you

In practice the subfloor decides. Slab means engineered. Radiant means engineered, glued. A dry wood subfloor above grade with a narrow-to-medium plank means solid is available and generally preferable.

Where there is a genuine choice, the question to answer is how long you intend to own the house. Solid is the better thirty-year floor. Over ten years, in a condo, engineered is not a compromise — it is the correct specification.