If you are going to install our roofing over an inground pool, always select the roofing diameter larger at least by 50 cm.
In case of semi inground or free standing pools always be aware of the fact that the roofing is round and tapers upwards. In this case the roofing diameter has to be sufficiently larger.
Do not forget the space for skimmer and wiring or the space for filtration.
Comparative table of roofing sizes according to the pool diameter and its height
For inground pools use the height from the ground to the top edge of the pool.