ᐅ Should concrete be waterproof or permeable?

Created on: 3 Feb 2016 17:52
M
mystd
A somewhat unusual idea, but I am considering creating a kind of moat around the house. There is a very specific reason for this: I want to farm edible fish there. Now, the question is whether to make the concrete waterproof to prevent water from entering the basement, or to allow water to flow through so the basement stays damp and I can grow mushrooms there.

The question is: how much water will actually enter the basement? Will I need to pump it out from time to time, or will the energy required for pumping make the project unfeasible? Additionally, I need to prevent the living spaces from becoming too humid.

It’s a complicated project, but maybe someone here has ideas or suggestions.
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Wastl
4 Feb 2016 09:08
If you want to cultivate mushrooms, how do you prevent dangerous molds from developing?
I think it can get so uncontrolled that it would be better to have a sealed basement and grow mushrooms there in a dedicated room.
Is a moat possible at your place? You would need to secure your property well to prevent children from drowning in front of the house.
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mystd
4 Feb 2016 11:46
I was actually thinking of creating a sort of airlock, changing clothes, and ventilating the cellar only through HEPA filters. I don’t want to grow 100% mushrooms, but rather more valuable fungi, so that the effort is worthwhile. The mushrooms would also be exposed to a seasonal simulation, allowing them to be ready for harvest after just three months. This is only possible if you maintain very high humidity and can adjust light and temperature.

However, I just realized that if water from the pond seeps through the walls, spores from mold fungi might also pass through. Or is the concrete fine enough to filter them out?

The plot of land is not acquired yet, since this is an experiment, it will be built in a very remote location, far away from any children.
blockhauspower4 Feb 2016 12:24
I am absolutely certain that the fish will thrive in the alkaline environment of the fresh concrete wall. And the reinforcing steel will be very happy to be constantly exposed to moisture.

With this brilliant overall design, one wonders why not everyone raises fish in the house moat with a drawbridge and cultivates gourmet mushrooms in the permanently damp basement.
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mystd
4 Feb 2016 12:32
If steel is used, only the kind coated with epoxy resin should be chosen. How long is the concrete considered "fresh"? I had assumed that everything is fully cured after 30 days.
WildThing5 Feb 2016 13:32
Our structural contractor told us that our concrete ceilings only fully dried out after 2 years. But I wonder if it’s the same with your concrete for the fish farming system..?
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Saruss
5 Feb 2016 17:47
Actually, drying usually happens faster. Maybe the structural builder means final strength? In concrete, very slow chemical reactions occur, which is why it really takes that long. However, the strength changes very little after one month.