How worried should I be about unlevel floors/vibrations?

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As long as its off the same on the front and the back i think you will be ok.. What causes the issue is if they are TWISTED If the tank has a plastic trim Often this trim is off some as well... So that could be part of it.

If you are measuring water to top of the glass

If you are measuring water to top of Plastic trim....

Is what i am talking about Trim my not be perfect...

So if you measure front left and then rear right and are off 1/4 inch. I would be slightly concerned as this is a sign of twisting..

Hope this helps. But in general i think you are fine. my 7 foot long tank is off 1/8 of a inch from one end to the other. This is because i used a 5 foot level instead of my Transit when building the base . knowing my floor was out of level. 88 year old home.......

Levels Just are NOT GOOD Enough unless they are as long as the distance you are spanning the item..

Erica Renee.. MASTER Carpenter

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by lj
(ashburn, ga)

A friend gave us a 24ft. above ground pool (one piece metal wall) which we installed ourselves (crazy).

We have a couple of issues. (1) The pool is not level. One side is about 5-6 inches lower than the other side. We thought this would be okay since the filter and return are on the deeper side. Another friend then told us that we couldn't leave it this way because if a wave went over the side everything and everyone in the pool could be swept out. Is this true? We have two small children and are now afraid to take them in.

(2) We (stupidly) had way too much sand brought in. So we just spread it out and set the pool down in it. Which we now know is a no-no. There is a lot of sand packed around the outside and everything looks stable enough but can we leave it this way or can we remove the sand from around the outside and replace it with dirt? Or do we need to just drain it and start all over?

I really...

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The misconception is that a concrete subfloor must be completely level to install hardwood. Actually, the floor must be flat, which allows for minor variations in the level. Tiny dips or ridges in the concrete won't affect your hardwood floor installation, but large ones can lead to floor squeaks later as the connection between the floor boards is stressed. Adding a layer of self-leveling compound to your concrete adds an extra day to your flooring job, but it reduces the chances of problems with your flooring later.

Lay a 8- to 10-foot piece of lumber on the concrete floor. Position yourself in a way that allows you to see the board more or less from the side and look for low areas that show up in relation to the flat lumber.

Measure the depth of the lowest area of the dips. If it's deeper than 3/16 inch, it must be repaired before laying your hardwood. Dips smaller than 3/16 inch over a 8- to 10-foot span don't require repair. Mark the low areas with a piece of...

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As I said, this floor is perfectly flat, no lips on any edges. The thin set varies from hard down on the subfloor, to being built up 1 1/2" thick in some areas.

This floor is one half of an 80 year old building that was built 5" out of level with a floor like a roller coaster. Two years ago, I did the other side of this building with the floor in just as bad of shape. In fact, I had to replace half the floor joists first because they were half rotten and had sagged 2". (Oh yeah, this is a wood floor over an 8' basement).

I can vouch that the floor will indeed hold up without cracks. The side I did two years ago is for a wine making store. The floor has literally about 6 tonnes of weight on it. There are 15 racks to hold carboys of wine, each carboy weighing around 50 lbs. Each rack holds 10 carboys, plus 5 more on the floor under it. The racks have four feet about 3/4" around. I am not going to do the math, but it is a lot of point load and the floor is taking it...

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Having done this job more times than I can remember, here are a few thoughts.

- Dig out the floor, stop trying to rationalize some other nonsense.

- Warner is probably right, that cement is most likely 2" thick more or less. Old basement floors like that are very common here. It could be thicker but the odds are low. It's easy to break out and dig. It's messy, sloppy work but good work for a bunch of teenage boys. Have a teenage son with friends? Buy a few demo hammers and shovels. When we used to do these jobs when I was a teenager, my old man would let me know and I'd get some buddies together. Worked out great, we'd get paid a lot more than anywhere else; it was a lot cheaper for the old man than paying real men.

- Around here $7 a square foot is fairly average for repour by a contractor

- Do you have floor drains? Check the floor drain to see how far down it goes prior to the trap. This will give you an indication of how low you can dig without...

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