Datum Marker for finished floor level (FFL) and axes 

RS10 & RS11* (*self-adhesive)

RS20 & RS21* (*self-adhesive)

• The markers RS10 and RS11* are used to secure survey points on construction sites without plastering work and in door or window reveals.
• To secure axis permanently until the building is completed, the markers are already measured and fastened in the slab formwork or the slab edge formwork on axis.
• The negative imprints, which are clearly visible for all trades, are used for the dry wall construction and any further inside installations. 
• The foreman uses the negative imprints at the ceiling edge to transfer the axis right to the freshly concreted ceiling with a string (chalk line) or laser. If required, they can later be used to install the façade.
• The RS10 & RS11 Datum Markers are also available in red without the inscription “Meterriss”. Article no. RS10r oM. and RS11r oM.

• The markers RS20 and RS21* are installed on unplastered or unrendered walls and serve as clear reference points for all trades.
• To avoid measurement differences during transfers, the markers are equipped with a protrusion to accurately align a measuring tape or rod.
• The elastic “stubs” ensure that the datum point remains visible and retrievable even after plastering, securely maintaining heights and axes beyond the plastering phase.
• To prevent potential tampering, the corners of the markers are sprayed with color, making any intentional repositioning immediately noticeable.
• After completing all work, the brushes are easily clipped off, requiring minimal finishing, while the markers remain embedded beneath the plaster as a permanent proof.
• For optimal installation, we recommend securing the markers with adhesive and additional fixation where needed.
• We recommend gluing the markers and securing them at least once.
• The RS20 & RS21 Datum Markers are also available in red without the inscription “Meterriss”. Article no. RS20r oM. and RS21r oM.

Datum Markers RS20 and RS21 after plastering work, the upper edge of the pin acts as the marker:

The Datum Markers stay under the plaster as proof.

RS21 Datum Markers are perfect for attaching to round pillars:

Before mounting on the pillar, use a carpet knife to cut into the plastic surround on the Datum Markers approximately 4 times at one centimeter intervals. The Datum Markers can then be attached easily to pillars with a small diameter.

Datum and axis markers from Rothbucher Systeme have been the worldwide standard on many construction sites for years.