Why You Shouldn’t Tile Directly Over Plywood: Avoid Cracks and Mold

Learn why tiling directly over plywood can cause tile damage and mold, and discover the best underlayment for a durable tile install.

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Tiling directly over plywood is generally advised against because plywood expands and contracts due to changes in temperature and humidity, which can lead to tiles cracking or becoming loose over time. Additionally, plywood is not inherently waterproof, raising concerns about durability and mold growth under the tiles. For a more stable and durable installation, it's best to use a cement backer board over the plywood, which will provide a firm and moisture-resistant foundation for tiles.

FAQs & Answers

  1. Can you tile directly over plywood? Tiling directly over plywood is not recommended because plywood expands and contracts with humidity and temperature changes, which can cause tiles to crack or come loose.
  2. What is the best underlayment for tiling over plywood? A cement backer board is the best underlayment for tiling over plywood, as it provides a stable, moisture-resistant surface for a durable tile installation.
  3. Why is plywood not suitable as a tile base? Plywood is not waterproof and can promote mold growth, and its flexibility due to expansion and contraction can lead to tile damage.

Watch More

For more insights on proper tile installation and choosing the right materials, check out our guides on waterproofing under tile and comparing different types of tile backer boards to ensure long-lasting and professional results.

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