Skip to content

TideMark™ · by Oasis Engineering

Elevation. Set. Pour.

A TideMark is an elevation reference stake placed by a licensed professional engineer at a surveyed location and locked to one height: your finished floor elevation. Tie your line to it and set your forms. No re-measuring.

I found a TideMark on site I need one for my project →

TideMark is an elevation reference tool — not a boundary, topographic or construction survey. You remain responsible for verifying field conditions match the exhibit.

You found a TideMark

It's already set. Just tie your line.

The lock screw marks your target finished floor elevation. Your project's PE-stamped TideMark exhibit has the details; the six steps below are the whole job.

  1. 01

    Locate all stakes

    Find every TideMark on site using the exhibit site plan. Confirm each one is upright and undisturbed.

  2. 02

    Attach the eye bolt

    Remove the cap and thread the eye bolt into the top of the tower.

  3. 03

    Tie your stringline

    Run your string through the eye bolt. The stake is already set to the correct FFE — no measuring needed.

  4. 04

    Set forms to the line

    Align the top of your formwork with the stringline. That is your finished floor elevation.

  5. 05

    Photograph everything

    Photo each stake showing the lock position, a tape measurement to top of form, and an overall shot of the formwork.

  6. 06

    Send for verification

    Send the photos to the engineer. Do not pour until you receive written clearance.

Critical

Do not disturb the stakes.

If a stake has been disturbed in any way, stop and call the engineer before proceeding. The contact is on your TideMark exhibit — or (813) 694-8989.

  • !Do not move, pull, re-drive or relocate any TideMark stake.
  • !Do not adjust or loosen the lock screw. It was set by the engineer.
  • !Do not use a stake that has been hit by equipment, tilted or pulled out.
  • !Do not pour concrete without photo verification from the engineer.

What's in a TideMark

A stake, and the stamped exhibit that gives it meaning.

Every TideMark comes with a PE-stamped elevation exhibit — the document that tells your crew what the stakes mean and how to use them.

  • Target elevation

    The exact Finished Floor Elevation your slab needs to hit, referenced to NAVD88.

  • Stake locations

    Site plan showing where every TideMark was installed and what each offset means.

  • Photo references

    Annotated photographs of each installed stake so you can confirm you are at the right one.

  • Verification protocol

    What photos to take, who to send them to, and what to do before you pour.

TideMark elevation reference stake at a slab formwork edge

Need this for your project?

Elevation established. Stakes installed. Done.

We visit your site, perform a differential elevation observation, install TideMark stakes set to your required FFE and deliver the PE-stamped exhibit. Your contractor shows up to stakes that are ready to use.

  • Barndominiums
  • Detached garages
  • ADUs
  • Workshops
  • Flood-zone structures
  • Slab-on-grade homes
Order a TideMark(813) 694-8989

Open source

TideMark is open hardware.

Hardware designs, field guides and documentation are on GitHub. Print your own. Modify the design. Contribute improvements.

View on GitHub →