Beam & block flooring is not sufficiently flat or stable to take the microcement directly. Because microcement is very thin, with a finished depth of just 3-4mm, it is very much dependent on the substrate that it is being applied to.
It’s essential that the following criteria are met before microcement is applied:
Essential Prep for all Surfaces
Your builder / flooring contractor can advise the best way of meeting these requirements after your beam & block floor is installed. Usually, the beam & block flooring will be overlaid with a cement screed before microcement can be applied.
For more information on preparing screeds for microcement, see the guide below:
https://relentlessmicrocement.com/training/preparing-concrete-screeds-self-leveller-for-microcement/