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Thought I'd post back with what I ended up doing. The underlying concrete was also weak and insubstantial (gave it a light bash with a sledgehammer) I ended up digging out the 6 post holes and setting the 4x4's in postcrete. The deck subframe feels really solid (so far :wink: )

Thanks powerst. A friend said similar (about it not budging), particularly as it's mainly for access rather than entertaining). Gut feel is to expose the rest of the underlying concrete (foundations or old concrete 'patio'?) and mount the posts on that if it looks stable and solid.

Hi all, First post and hope you don't mind another newbie with a question about deck foundations :) I'm installing a small (7.2' x 4.2') deck and steps to provide access from our kitchen to garden which will be just under 2' off the ground. My plan is to sit the deck frame on six...