Length and width (ensure that both these measurements are checked,even if they look the same it is vital that each is measured individually). This also applies to the round spas. (Refer to Diagram 1.)

Height of the lip is also a most important measurement that need to be accurate. (Refer to Diagram 2.)

Length of Sides A spa with more than 4 sides will need each side accurately measured. (Refer to Diagram 3.)

Radius of the corners this measurement applies to spas that have rounded corners. (Refer to Diagram 4.)

Position of controls need to be measured as well if they exceed 24mm in eight, this allows the foam core of the spa cover to be modified to fit over the controls. (Refer to Diagram 5.)

MEASURING TOOLS YOU WILL NEED

1. A measuring tape with metric rule.
2. A minimum of two straight edges that are at least one metre long.
3. Somebody to help you measure as the measurements need to be totally accurate.

DEFINITION OF AN EXTENDED CORNER

When a spa has a curved corner, the extended corner is where the sides would meet had the corner been straight.