Solid hardwood flooring is crafted from one solid piece of wood from top to bottom. Because it is a natural, hygroscopic material, it is highly sensitive to fluctuations in relative humidity, which causes it to expand and contract. This requires careful climate control to prevent cupping or gapping, maintaining the building between 30 and 50 percent relative humidity according to NWFA standards. It can be sanded and refinished multiple times throughout its lifespan, making it a long-term investment for many homeowners. Engineered hardwood, by contrast, is built in layers. The top wear layer provides the beauty and durability of the species, while the cross-ply core structure works to counteract the natural tension of the wood grain. This engineered construction significantly reduces the risk of warping or buckling in humid or dry conditions, making it suitable for installations over concrete slabs where moisture risks exist. The refinishing potential of an engineered product depends entirely on the thickness of that top wear layer, ranging from a budget 1-2mm to a premium 3-6mm plus.

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