What is the recommended foundation or base for the spa?
We recommend a 100 mm thick reinforced concrete pad for portable spa and 150 mm thick reinforced concrete pad for swim spa. Alternatively, a deck built to Australian building standards and certified by a qualified engineer that it can carry the full weight of your spa. Please consult with your product spec sheet for spa weight.
If the foundation is inadequate, it may shift or settle after the spa is in place, causing stress to the shell and cabinet.