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What wood can get wet in shower?

Published in Water Resistant Wood 5 mins read

Certain types of wood are naturally resistant to moisture and can be successfully used in shower environments when properly treated and maintained. These woods possess inherent qualities that help them withstand high humidity, direct water exposure, and temperature fluctuations.

Ideal Wood Characteristics for Wet Environments

For wood to perform well in a shower, it should exhibit specific characteristics that prevent damage from moisture:

  • Natural Water Resistance: Some woods contain natural oils or high densities that repel water, making them less susceptible to rot, mold, and mildew.
  • Dimensional Stability: Wood with high dimensional stability is less prone to shrinking, swelling, warping, or cracking when exposed to changes in moisture and temperature. This is crucial for longevity and appearance in a wet area.
  • Durability: The wood should be strong enough to withstand continuous use and cleaning.

Top Wood Species for Shower Use

Several timber species are known for their excellent resistance to moisture, making them suitable choices for shower applications, whether for flooring, paneling, or furniture. These include both naturally resistant woods and those that can be made more resilient through specific treatments.

  • Iroko: Known for its durability and water resistance, Iroko is often compared to Teak. It boasts excellent dimensional stability and high resistance to shrinking and warping, making it a reliable choice for moisture-rich environments.
  • Oak: A strong and durable wood, Oak also exhibits good resistance to moisture, especially certain varieties. Its density contributes to its stability.
  • Western Red Cedar: This wood is naturally resistant to decay and insects, performing well in damp conditions due to its inherent properties and dimensional stability.
  • Cherry: While perhaps less common than others for direct shower use, Cherry can offer good dimensional stability and resistance to moisture when properly finished.
  • Maple: Maple is another dense wood that, with appropriate treatment, can be used in areas with fluctuating moisture levels, showcasing good dimensional stability.
  • Heat-Treated Woods: Timber that undergoes a thermal modification process becomes highly resistant to moisture absorption, rot, and decay. This treatment enhances the wood's dimensional stability significantly, making many species viable for wet areas where they wouldn't be otherwise.
  • Teak: Widely regarded as the gold standard for wet environments, Teak contains natural oils that make it extremely resistant to water, rot, and pests. It's often used in marine applications and outdoor furniture.
  • Redwood: Similar to Western Red Cedar, Redwood has natural resistance to decay and insects, making it a good candidate for areas with high moisture.

Here's a comparison of some suitable wood types:

Wood Type Key Characteristics for Wet Use Natural Resistance Dimensional Stability Common Applications in Wet Areas
Iroko Durable, good water resistance, strong, resists shrinking. Excellent High Shower trays, decking, outdoor
Teak High natural oil content, extreme rot & water resistance. Excellent Very High Marine, shower benches, flooring
Western Red Cedar Natural decay & insect resistance, lightweight. Very Good High Wall paneling, saunas
Oak Durable, dense, good moisture resistance with proper sealing. Good Good Cabinetry, flooring (well-sealed)
Cherry Stable, attractive grain, requires thorough sealing for wet use. Moderate Good Decorative accents (less direct water)
Maple Dense, hard, requires good sealing to prevent moisture issues. Moderate Good Cabinets, decorative elements
Redwood Natural decay resistance, attractive color. Very Good High Siding, outdoor, shower accents
Heat-Treated Wood Enhanced dimensional stability, reduced moisture absorption. Excellent (post-treatment) Very High Flooring, paneling, outdoor

Essential Treatments and Finishes

Even naturally resistant woods benefit significantly from proper treatment to enhance their longevity in a shower environment. Applying a suitable finish creates a protective barrier against water penetration and helps prevent mold and mildew growth.

  • Penetrating Oils: Oils like tung oil or teak oil penetrate the wood, conditioning it from within and providing water repellency while maintaining a natural feel. Regular reapplication is necessary.
  • Marine-Grade Varnishes or Sealers: These offer a hard, durable surface film that creates a waterproof barrier. They are designed for extreme moisture exposure and provide robust protection.
  • Epoxy Finishes: For the ultimate waterproofing, particularly for shower pans or high-traffic areas, an epoxy coating can encapsulate the wood, making it impervious to water.

Installation and Maintenance Tips

To ensure the longevity of wood in a shower, proper installation and ongoing maintenance are crucial:

  • Excellent Ventilation: Ensure your bathroom has robust ventilation (e.g., a powerful exhaust fan) to quickly remove moisture and prevent humidity buildup, which can damage even water-resistant wood over time.
  • Proper Sealing and Grouting: All joints, seams, and edges where wood meets other surfaces (like tiles or fixtures) must be meticulously sealed with waterproof silicone caulk. For shower pans, proper slope and drainage are paramount.
  • Regular Cleaning: Clean the wood regularly with mild, non-abrasive cleaners to prevent soap scum and mildew buildup. Avoid harsh chemicals that could strip the finish.
  • Reapplication of Finish: Depending on the type of finish, periodic reapplication will be necessary to maintain its protective qualities. Follow the manufacturer's recommendations.