5/16 wave in concrete floor

[AuxWelding]

I have a 5/16 inch wave occuring over about 2.5ftx5ft section on my garage floor. Is this common in garage floors? I'm about to have the floor finished with polyuria and wanted to know if I should have it corrected before going ahead with the coating.

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[SolarColumbia]

I don't think that's a concern. If you're having it coated what does the installer say?

 

[AuxWelding]

I don't think that's a concern. If you're having it coated what does the installer say?

They said it's normal. I've decided I'm being too obsessive. I'm just going to have it coded as is.

 

[Sumboodie]

We have waves in the warehouse at work that bottom out the forklift. Probably 2" in 5ft.

 

[AuxWelding]

We have waves in the warehouse at work that bottom out the forklift. Probably 2" in 5ft.

Haha I can't stop picturing a new operator figuring that out for the first time.

 

[Sumboodie]

Haha I can't stop picturing a new operator figuring that out for the first time.

The floor epoxy is worn off in the several bad spots from rubbing so it's pretty easy to spot.

 

[ConCretin]

That is a pretty good dip. I can't tell how long your straight edge is but I'm guessing 6'? If you used a 10' straightedge, which is the typical standard for evaluating a slab, I suspect you'd be looking at a 1/2" gap. If I'm right, that's outside what most would consider an acceptable level of flatness. Ideally you're looking for no more than a 1/4" gap under 10' straightedge for a reasonably flat residential slab.

With that said, the path forward depends on your circumstances. Is your contractor bound by any particular standard? What are the chances you can get him to successfully improve the flatness of your slab? How bad will it bother you when your new shiny new coating makes the waviness look even worse?

 

[AuxWelding]

That is a pretty good dip. I can't tell how long your straight edge is but I'm guessing 6'? If you used a 10' straightedge, which is the typical standard for evaluating a slab, I suspect you'd be looking at a 1/2" gap. If I'm right, that's outside what most would consider an acceptable level of flatness. Ideally you're looking for no more than a 1/4" gap under 10' straightedge for a reasonably flat residential slab.

With that said, the path forward depends on your circumstances. Is your contractor bound by any particular standard? What are the chances you can get him to successfully improve the flatness of your slab? How bad will it bother you when your new shiny new coating makes the waviness look even worse?

It was a 4ft level. From what I understand the dip was just over 1/4 in. It didn't seem with the effort to deal with it. I had the floor sealed. I notice it a lot less now.