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I've read a lot online that deck posts should be a minimum of 750mm deep to be below the frost line to prevent movement in freeze/thaw cycles. I'm planning on using 2 bags of postcrete on each post but 750mm deep seems quite overkill to me. Is postcrete affected the same way as normal concrete...

Hey all! I'm planning on building some decking for a hot tub we have as our garden is extremely sloped (yay new builds). We have a Lazy Spa Paris which comes in at just over 1.2 tonnes when filled (without people), so I'm planning on it to support 2 tonnes. I'm starting the decking out to be...