What Should You Put Behind Cement Board in a Shower? Moisture Barrier Tips

Learn what to put behind cement board in showers to prevent water damage—essential moisture barrier options explained.

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When installing cement board in a shower, it's important to put a moisture barrier behind it. This can be plastic sheeting (like 4-6 mil poly) or roofing felt. The barrier helps prevent water from penetrating through the cement board and reaching the framing and insulation, thereby reducing the risk of mold and water damage.

FAQs & Answers

  1. Why is a moisture barrier needed behind cement board in a shower? A moisture barrier prevents water from penetrating through the cement board, protecting the framing and insulation behind it from mold and water damage.
  2. What are common materials used as moisture barriers behind cement board? Plastic sheeting (such as 4-6 mil polyethylene) and roofing felt are commonly used moisture barriers behind cement board in shower installations.
  3. Can you install cement board in a shower without a moisture barrier? Installing cement board without a moisture barrier increases the risk of water damage and mold since moisture can seep into the framing and insulation.

Watch More

For more tips on bathroom waterproofing and tile installation, explore our related guides on shower waterproof membranes and best practices for tile backer boards to ensure a long-lasting, mold-free bathroom environment.

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