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I just bought a home with hardwood floors everywhere, including the bathrooms. While this is nice, I worry that they will be damaged by constant exposure to water. Is there anything I can do to protect them, besides high quality bath mats?

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A few drips here and there are not going to destroy them. If your shower constantly floods the floor that's a different story – Steven Feb 6 '12 at 14:59
@SteveR Wouldn't that be an answer? – C. Ross Feb 6 '12 at 16:46

We also have a wood floor in our bathroom. I placed a plastic bathtub mat on the floor in front of the shower and then placed a bathmat over it. After 17 years, we have some damage to the floor, but mostly in the areas just outside of the mat area.

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Hi Aleta, welcome to DIY.Stackexchange.com! Thanks for the answer, it's hard to find 17 years of experience! – C. Ross Dec 29 '12 at 16:19

Wood constantly moves by expansion and contraction which varies with humidity and moisture. There is no "sealant" that I know of that would prevent this natural movement and the cracks between the planks from opening and closing as a result. Wax will protect the surface finish, but make them slippery unless you use a non-slip formula.

The only recourse is to use bathmats (as you've already identified) and wipe up the floor if you should splash water on them. Just be careful with the combination of cloth bathmat and waxed floor. Also be careful of leaving rubber backed bath mats on the floor finish. Some may change the sheen of the floor (dull it) and leave an outline of the mat/rug.

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Keep a good coat of wax on them. Clean up water ASAP

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also ensure all cracks down to the subfloor are filled with a waterproof filling ASAP – ratchet freak Feb 6 '12 at 19:02

This is a good one. I find that rather than just getting a bath mat, it might be best to get a large piece of rubber that can be placed under the mat to keep it in place. It may also help to cover your floor with a strong varnish or something like wax, this can help keep the floor better for longer and protect from thing like water.

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