# Tips for achieve slab flatness in office building?

> The spec on our office tower has some stringenct levelness and flatness tolerances. We’re talking to a few different concrete vendors and they are all saying they will be a challenge to hit. Does anyone…

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- Last updated: 2023-04-20

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The spec on our office tower has some stringenct levelness and flatness tolerances. We’re talking to a few different concrete vendors and they are all saying they will be a challenge to hit. Does anyone have any experience achieving high flatness and levelness tolerances on suspended slabs?

For information the FF / FL requirement is 50 / 50.

Thanks in advance!

## Answers

### Answer 1

Hey there Ruby - thats extremely high for a commercial slab but regardless a few tips for you:

- Have your concrete contractor submit a plan on how they intend to achieve the flatness levels prior to the pour
- If it's on metal deck you'll likely need to shore the bottom of the slab
- Have your contractor and supplier review the mix designs
- Use a laser screed and ride on trowels. That level is extremely challenging to hit manually
- Make sure to measure at the alotted time.