Best flooring for damp springhouse?

Question

I have a springhouse sitting atop a mostly buried, 14' X 14' open-top concrete cistern. The plywood flooring is rotted and needs to be replaced. Though the cistern has some vents below the floor level, the underside of the floor is essentially a high-humidity environment. What is the best material or construction to use for this floor? Things I have considered:

1) pressure-treated plywood (rejected, since this sits just over our drinking water),

2) Marine-grade plywood (very expensive)

3) exterior-grade plywood, installed over a vapor barrier (6 mil poly sheeting?)

What will work best?

Thanks,

Kelly

Goedjn · Accepted Answer

Concrete planks.

Kelly E Jones · Answer

Never heard of them before, but they sound promising.  But, I imaginethey weigh significantly more than plywood.  WOuldn't I need to beefup the joists, as well?Kelly

No · Answer

Does it need to be plywood? Could you do it like a deck and use 5/4 or

2x deck boards? If you don't want the spaces then how about tongue and grove planks? They are available in Mahogany, fir and pine. You could maybe even route some PT pine decking to fit together T&G.

Mahogany T&G is not too expensive around here (relatively speaking) and is used on exterior porches. (Think Victorians, etc)

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Goedjn · Answer

They ARE the joists. I was talking about those 2' wide,

8" deep, hollow-core pre-stressed concrete planks that come in lengths up to 40' It would be a stupidly expensive way to solve the problem, but it would be permanantly solved.

Best flooring for damp springhouse?

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