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Question DetailsAsked on 4/1/2018

Sealermater: When using Hydro-Seal 75 then stucco cinder block foundation. Do you let HydroSeal cure(72hrs)?

How long should you let the hydro-seal set before applying stucco to cinder block foundation?

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1 Answer


I can't imagine fresh cement and water (from the stucco spraying) getting on the wet HydroSeal nor the high humidity and possible water condensation from the stucco drying is going to help the waterproof surface effect any - I would let it dry in good drying conditions (so may take longer in cool. moist basement environment even with direct fan use) for the 4 days they recommend to fully cure.

Assuming you mean exterior stucco, don't forget that you need to leave typically 4-6 inches clear from the ground to the bottom of the stucco to prevent wall system deterioration, moisture accumulation from wet ground, and insects. (Top of foundation should also be that high above the surrounding ground too.) More like 12-18" is recommended in termite, post beetle and carpenter ant country (though the latter two can be fairly readily controlled by whole-house perimeter protection like Ortho Home Defense applied on the soil and foundation).

If you mean interior stucco, contact the manufacturer about that - because of the moisture transmission through the product (it is NOT truly waterproof, just highly water resistant) from the moist ground outside they do NOT recommend tile installations over it. I suspect ditto for stucco, not only because of the moisture issue but also the moisture transmission will start rusting of the stucco support mesh and rust bleed-through too. To me, stucco is a bad choice for basements anyway, especially if not fully part of the conditioned space (heated and air conditioned) because of the higher moisture - stucco tends to be pretty prone to mold formation, though it is possible to put mold inhibitors in the mix to limit that problem.

And of course, because the product leaves a pretty glossy surface, I most certainly would NOT try bonding directly to it - I would definitely use a bonding mesh.

Normally, for that sort of finish on the inside of a basement wall, one would use a waterproofing agent (HydroSeal 75 or another) mixed in with a (usually) sanded portland cement bonded parge coat over the cinder block, then a water barrier sealant/paint (which could be 75, or using that as a primer) for the final interior finish. A parge coat, applied by an expert, can be done to the same appearances as sprayed stucco.

Answered 2 years ago by LCD

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