How flat is flat enough for stone composite flooring?

3 years ago

Hi,

I'm about to install Stone Composite Flooring, and I have a question about how to level the floor. If we lay a 4-foot level down anywhere, we don't have any gaps we can slide a 1/8" shim under. But in some places we can find a little bump and when we press down on the level we can raise the other end by 1/8". Especially when we put the bump a few inches from the end of the level. Is this too much testing? It seems like this would simulate stepping on a board and having the other end lift up, which would be bad. Is the first scenario enough?

Thanks for your help.

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Comments (4)

millworkman
3 years ago
Usually it is 1/8" over 10'. Get a longer straight edge.
G Travassos
Original Author
3 years ago
last modified: 3 years ago
Thanks. We do have a longer straight edge, but the manufacturer's box says 1/8" over 4', so we have been focusing on that. Even with a longer straight edge, if the pivot point is close to the end of the ruler, the other end can pop up pretty high but lays flat if we don't push on the end. My question is more about technique. Are you laying the level down and checking it, or are you trying to pop a wheelie on it over the smallest humps? How much does stuff like this relax over time?
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millworkman
3 years ago
It needs to be flat, period. No wheelies.
G Travassos
Original Author
3 years ago
That's what I was hoping. Thanks for the help.