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Question DetailsAsked on 4/26/2015

I have a small area that is rotten board that my hot tub sits on, how do you fix it

My hot tub sits on our deck above ground, infront of the deck on top of the floor joint or rafter the two ends of the board meet and at each end they are rotten. How do i fix that

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1 Answer


Likely the supporting or trim wood was untreated - wood under a jacuzzi or hot tub should always be treated - and should have a water barrier or waterproof surface around it for a couple of feet to trap the water and drain it away harmlessly. Also, I am guessing these are ends in under the hot tub - probably moreprotected from air and sun so they stay wet more, hence rot faster than the rest of the decking.

Sounds like replacing the boards will be needed - usually can be fairly easily done by shimming the empty tub up just a touch so the new boards can slip in under. May need some creativity to fasten them down under the tub where you can't reach, like brackets from under the deck to screw into the bottom of the boards maybe, otherwise they are likely to warp badly. Also - ideally your boards would have no joints under the hot tub, as ends rot easier than flat surfaces - soak up the water more.

Handyman can probably handle it, otherwise Deck company. Make sure they do not damage tightly fastened wiring or plumbing by lifting the hot tub up - and if a "barrel" type - individual boards banded together, rather than a unitized fiberglass or plastic one, you have to be VERY careful lifting, using plyood underneath, so the "slats"do not get out of alignment or breakthe banding. And NEVER lift with water in it - most will self-destruct under the weight of a half ton or more of water.

Answered 4 years ago by LCD

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