PSI needed for gunite pool


Active member
Aug 19, 2020
I have read that the gold standard for a gunite pool is 4000 PSI. I have also read about PB building at 3000 PSI. How much greater chance is there for structural failure at 3,000 vs 4,000 PSI


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LifeTime Supporter
TFP Guide
Jul 3, 2013
Fletcher, OK
I had no idea so I went to the google machine :)

Looks like 4000 is the way to go....



Jan 20, 2020
Cresaptown, MD
I don't know how one could estimate the chance of structural failure between 3000 vs 4000 psi. I believe there are many other variables that would/could impact the long term structural soundness of a concrete structure. For example: sub grade conditions, steel rebar layout/design, temperature during placement, placement procedures, curing conditions, climate and freeze /thaw cycles, thickness, slump properties, etc. That being said, If I had the choice I would always choose the higher psi mix design for any water containing vessels, retaining walls, light commercial slab applications, etc. ; I am not in anyway an expert on concrete or pools though.


TFP Expert
Bronze Supporter
In The Industry
Aug 10, 2017
Morris Cnty NJ
Its 10 to 15 dollars a yard more for 1k psi upgrade on cost of concrete. So 300 bucks average, cheap insurance to me I wouldnt use less than 4k. I actually use 4kpsi for everything I pour
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