Support subfloor issue

sgdnycct

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Hi all,

I recently upgraded from a Fiji 38 AIO to a NYOS 440. I had the carpeting ripped up and asked the installers to ensure it was level. I triple checked this with them because the FijiCube was never fully level. So everything got checked and I even checked the level and fit of the subfloor with them. It all checked out. They finished installing the floor and putting in new baseboards. Now I put the tank up and it’s pitching down 1/8” from the wall toward the center of the room. We again removed the tank and checked the level and the floor checked out. So at this point I’m thinking it’s something loose with the subfloor panels so I filled the tank and leveled it. It was fine at first so I got it started and transferred the livestock. Two weeks later I noticed one of the feet of the cabinet wasn’t touching the floor and the tank was off level. I re-leveled it but in the back of my mind I have this fear of something going wrong in the future.

We decided in November to have the rest of the upstairs refloored. This time I explained again to the guys about the issue. We were all scratching our heads. Anyway, we found a similar issue in the master bedroom. They had to tear out a big section of floor and they found that a seem of plywood was the issue, where if you didn’t step on the seem but were close, the plywood would give up to 1/4”. They pulled the plywood and found there was a 22” space between the tresses. They added supports as needed and the rest went fine. So now the issue with the tank is likely the gap between tresses. I’d rather not pull up the flooring and tear down the tank. The contractor suggested opening the ceiling in the room below where the tank sits and fixing it from there.

Any thoughts or opinions on a way to manage or fix it without risking damage to the tank? Or am I worrying too much and just need to keep it level?
 

UncommonSense

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Any thoughts or opinions on a way to manage or fix it without risking damage to the tank? Or am I worrying too much and just need to keep it level?

My immediate thought would be to make a rigid lumber plate spanning the length of the stand to set the stand on; this way you’re supporting across multiple floor joists, and not putting point pressure in any one place on the plywood flooring with stand feet!
 
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sgdnycct

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Any thoughts or opinions on a way to manage or fix it without risking damage to the tank? Or am I worrying too much and just need to keep it level?

My immediate thought would be to make a rigid lumber plate spanning the length of the stand to set the stand on; this way you’re supporting across multiple floor joists, and not putting point pressure in any one place on the plywood flooring with stand feet!
Thanks for that suggestion. I had tried that setup while I still had the carpet when testing out the tank and it was still off level so I’m thinking the entire front of the tank might be running near the edge of a plywood plank.

I did think about adding a larger piece under the cabinet but the I start running into space issues.
 

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