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Just bought a new place with white oak hardwood and radiant heating.

The hardwood is 3/4" (verified). Floor has developed gaps in certain areas. One area in particular is loose when I walk on it, so the gap is more pronounced. Looks like the gap had been puttied in the past and now the putty is coming out.

You can see gaps and putty coming out in the photo below. The floor board moves up and down slightly if I step on either side of the gap.

What's the best way to fix address this?

p.s. I'm not sure what kind of radiant heating installation I have either. It was done in 2009 on a new construction in SF if at all helpful.

enter image description here

edit: here is one part that's exposed in the closet, wood is 3/4" thick enter image description here

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    That's not so much a symptom of radiant heating as low indoor humidity. Any idea what yours is at? What's your outdoor temperature? – isherwood Nov 5 '19 at 21:39
  • Outside is has been 70s+ lately and a bit hotter recently. Inside humidity is 38% per nest. Could the fact that the wood moves around the gap is making matters worst? It move down enough in some places that my toes scrape the wood across the gap. Trying to see if there is a way to fix that as well. – Dan F Nov 5 '19 at 21:45
  • That's fairly low humidity for such warm weather. Whether movement is an issue depends on the type of floor. You said that you though it was 3/4", which would be solid nail-down. You should probably find out for sure. – isherwood Nov 5 '19 at 21:46
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    @peinal - Your suggestion needs to be considered rather risky. Any screws driven through the sub floor like you suggest runs a good chance of damaging the radiant heat system under the oak floor. From a comment it looks like that heat system is a bunch of hot water tubes in the flooring. – Michael Karas Nov 6 '19 at 2:08
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    That makes anything that could be done risky. Your suggestion is certainly a possibility, but may not give the results you hope for. The good news is 3/4" hardwood can be torn out, re-installed and sanded to give good results. I have removed 40 yr old hardwood from old church demo, re-installed it, sanded and had good results. One issue here is if channels were routed out of the hardwood to make room for the heat tubes, you may not have as much surface to sand as with a 'normal' re-install. Do you know if it was glued during install? – peinal Nov 6 '19 at 3:28

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