Solid Timber vs Engineered Wood Flooring

What's Actually Inside Each Plank

Despite looking nearly identical from above, solid timber and engineered wood are fundamentally different products. Solid timber is exactly what the name implies — a single, uniform plank of wood milled from top to bottom. Its thickness (typically ¾ inch) is the same species throughout, which is what makes repeated sanding possible.

Engineered wood, by contrast, is a manufactured product with a thin hardwood veneer — usually 2–6mm thick — bonded over multiple layers of cross-ply plywood or high-density fiberboard (HDF). These cross-directional layers are what give engineered boards their dimensional stability: when humidity changes, the layers counteract each other's tendency to expand or contract.

This structural difference explains nearly every practical distinction between the two — from where you can install them to how long they'll last.

Moisture, Movement, and Where Each Floor Belongs

Wood moves with changes in humidity. Every species expands when moisture levels rise and contracts when the air dries out. Managing that movement is the central challenge of any wood floor installation.

Solid timber is highly sensitive to this cycle. In rooms where humidity fluctuates significantly — kitchens, bathrooms, or any below-grade space — solid planks can cup (edges rising), gap, or even split. Most flooring professionals advise against solid timber below grade at all, and recommend careful humidity management above grade using an HVAC system or humidifier.

Engineered wood is substantially more stable. Its plywood core absorbs and releases moisture more evenly, making it suitable for kitchens, open-plan areas with temperature swings, and basement-level installations where solid timber would struggle.

Underfloor heating is another key differentiator. The gentle, consistent heat from radiant systems causes continuous wood movement. Most engineered wood products are rated for use with underfloor heating; solid timber generally is not, as it dries out and gaps unpredictably.

Lifespan, Refinishing, and Long-Term Value

One of the most common arguments for solid timber is its refinishability. Because the plank is solid through its full depth, it can typically be sanded back and recoated four to eight times over its lifetime — effectively renewing the floor's surface every decade or two as wear, scratches, or style changes demand.

Engineered wood can also be refinished, but the number of times depends entirely on the thickness of the top veneer. A 2mm wear layer may allow one careful sand; a 6mm layer can accommodate two or three. Once that veneer is exhausted, the floor cannot be refinished and must be replaced.

In stable, dry conditions, a quality solid timber floor can last 50 to 100 years. A well-made engineered floor typically delivers 20 to 40 years of service depending on wear-layer thickness and maintenance. Neither outcome is guaranteed — proper installation, humidity control, and maintenance are equally important variables.

Upfront costs for solid timber tend to be higher, though engineered wood in premium hardwood species can approach similar price points. Installation costs vary by method: engineered boards are often floated or glued, while solid timber typically requires nail-down installation over a wooden subfloor.