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Don't use hardwood flooring in a bathroom without reading this expert advice for long-lasting boards
Hardwood flooring can introduce visual softness and warmth to modern bathrooms, which often feature many hard surfaces. While it offers aesthetic appeal through its visual interest, character, warm tones, and natural beauty, and feels comfortable underfoot, careful consideration is required to ensure its durability in a bathroom environment. Hardwood flooring is generally not recommended for children's bathrooms due to potential water exposure, but it can be a beautiful and long-lasting option for primary bathrooms, guest bathrooms, or powder rooms, provided proper care is taken.
Selecting the right timber species is crucial for bathroom flooring. Stable species such as cherry, maple, ash, red oak, or walnut are preferable over less stable options like beech, hickory, or birch. For enhanced stability in moisture-prone areas like bathrooms, riftsawn and/or quartersawn cuts are ideal, as they are twice as stable as plainsawn cuts. Oak is a popular choice due to its complementary natural color, hardness, and ability to be stained. Sourcing FSC-certified timber and considering fast-regenerating, hardwearing woods like Douglas fir and ash are important for sustainability.
Both solid and engineered wood floors can be used in bathrooms, but their performance is best when temperature and humidity levels are consistently maintained. Engineered wood flooring is more tolerant of temperature and humidity fluctuations than solid wood flooring, making it the recommended choice for below-grade bathrooms (ground level or basements). Engineered planks consist of layers of plywood beneath a real wood top layer, which enhances stability, particularly with underfloor heating and humidity. A top layer of 1/8 inch or more on engineered boards allows for multiple sanding and refinishing cycles, extending the floor's lifespan. Solid wood is more susceptible to movement in environments with fluctuating temperatures and moisture.
A suitable sealant is essential to protect hardwood flooring in bathrooms. Film-finishes such as waterborne urethane, oil-modified urethane, UV-ccured urethane, or aluminum oxide are recommended because standing water is common in bathrooms. These finishes are effective at preventing water penetration. While natural oils, waxes, and other penetrating finishes can be used, they may be prone to water-spotting in wet conditions. Properly maintained film-finishes can last the lifetime of the floor, requiring recoating every 3-10 years depending on traffic. Natural penetrating oils typically need deep cleaning and reconditioning annually. A polyurethane-lacquered coating effectively seals the wood's pores, protecting it from dirt and moisture. It is important to review sealant finishes on timber samples before purchasing, as they can alter the wood's tone.
Preventing warping and water damage is achievable with the correct precautions. Engineered boards, with their multi-layered construction, are less prone to warping in high-moisture rooms. Adequate ventilation, such as a motorized fan and opening windows after showering or bathing, helps maintain a consistent environment. Wiping up spills immediately is critical, as excessive moisture left on the floor is the primary cause of warping, cupping, or buckling. A professional installer is vital for laying hardwood floors in bathrooms. They will ensure the subfloor is properly flattened within specific tolerances (3/16” in 10 ft) by grinding high spots and filling low spots. This practice is essential for proper installation and is required by flooring manufacturers. If underfloor heating is planned, consulting with the supplier about suitable floorboards is also necessary.
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