Its good to talk about this stuff and work out the details , thought it best to double check the psi
Im thinking plywood (again haha) on top of the foam base would work well to spread the 800 lbs or so load from a big 80 gal tank. Although the tank bottom is flat enough to spread the weight good enough I guess.
The math at 24 sq.in works out to 5750 lbs load at 10 psi per sq. inch.
Type I EPS has been tested and found to fall within 10 to 14 psi. The resilience of EPS insulation board provides reasonable absorption of building movement without transferring stress to the interior or exterior finish at the joints
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