The yurt’s platform can be made from concrete but would need to be made with proper anchoring in mind. As with a wood yurt platform, a concrete platform needs to be circular, the proper diameter for the yurt and include a drip edge. A pressure treated wood (or composite lumber) sill plate will need to be anchored to the outer perimeter of the platform so the yurt can properly anchor to it with the hardware provided. Suggestions for a concrete platform can be downloaded here: https://www.yurts.com/downloads/.