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I need to build a platform/base in a partially finished basement that occasionally floods. The flood isn't much, about 1/2 inch, but it does stick around for a bit (at least until the dehumidifier takes care of it). Anything made of wood gets soaked enough to weaken the wood, and is probably a good home for mold. My first thought was to use plastic/composite lumber, as it can get wet without any damage, but I can't find information on what brands are suitable for indoor use. I've heard that some brands have gassing issues. Is there a brand suitable for indoor use?

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    I think it would be wise to do some research and try to find out where the water is entering. I would work on trying to fix the leak. – Paul Logan Feb 2 '18 at 2:59
  • I know where it is coming from, it's an older house, and during heavy rains, the basement seeps water. I am working to address is, but no solution is going to be perfect. – Erick T Feb 2 '18 at 3:01
  • I would consider aluminum tubing. – Paul Logan Feb 3 '18 at 7:02
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As long as your platform/base doesn't need to be structural, cellular PVC based decking/trim is acceptable for indoor use and that type of moisture exposure. Look at Azek's trim product line.

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