How to find the radius of a quadrant shower screen

To find out the radius of a quadrant shower enclosure, start by marking the point where the straight line ends and the curve begins on both sides of the tray's perimeter (see the black lines in the figure). Then, trace a third line that goes from the point of intersection of these lines to the centre of the curve in the tray's perimeter (see the red line in the figure).

The red line shows the radius' measure: 50cm for Roca shower trays and 55cm for Italian or Standard trays.

If you have any doubt regarding your screen's radius, choosing an enclosure with a Roca radius will be a more convenient option. By installing a Roca radius screen with a Standard radius shower tray, the only issue you will encounter is that the tray will be a little more visible from the outside. On the contrary, installing a Standard radius enclosure on a Roca radius tray will result in a shower enclosure that is not watertight, as it will protrude from the edge of the tray. 

Follow the indications in the following figure to measure your quadrant shower tray: