The Round One is the only product in our product portfolio, which does not come with an upstand. However, we don't leave you entirely on your own! Vario by VELUX will supply a top-plate (RAL 9010) with a pre-installed gasket system for optimal air tightness, ensuring a 100% tight and secure connection between the frame and upstand construction.
You'll need to get your installation contractor to construct your upstand for The Round One. The upstand can be built in various ways to fit the architectural requirements of the building, but if you are interested in the Vario by VELUX way of building them, so you know what to specify, we use a wooden upstand of at least 150 mm that is insulated with rock wool.