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The deck should be the same height as what you're stepping on in the spa.
Just wondering - if your spa is about 18 inches above the ground, will people tend to sit on it. Can the cover take people sitting on it?
Correction Brewman!You can have an entire show team of sales guys/gals on that cover. This is very important for those times you go to home show and happen to drag an entire sales team back to your house for a soak. HTMan
doodoo,My harassing Doc about his unit of measure is one thing but dude, I really have to question what YOU call 15 inches!!!!