Proper backfill material for island??

jaybray888

Member
May 2, 2020
7
Texas
Question regarding backfilling the void in my spa island. The final plan there is a regular concrete deck to serve as a landing for the bridge.

It sounds like my PB wants to use fill dirt in that opening. I assume Gravel is a better alternative, if that is even enough? Is solid concrete necessary?

Thanks!
 

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