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A membrane is the more reliable option, especially if your basement is already damp or sits in an area with high groundwater. It creates a proper barrier and will last longer than paint. The downside is that installation is more expensive and time-consuming - you need to clean the surface, sometimes remove existing finishes. But after that, you can forget about the problem for about twenty years.
Paint works if the situation isn't critical: no active leaks, just walls that sweat a bit or slight dampness appearing. It's simpler and faster to apply, and costs a fraction of the price. But it's more of a temporary fix - over time the paint will peel, especially where groundwater movement is active.
Your choice depends on how bad things are in your basement now and whether you're willing to invest in a proper solution. What's your situation like: just preventive treatment, or are you already dealing with visible moisture problems?
любовь38 asker
We already have leaks after rainstorms, so I'm leaning toward a membrane, even though the cost is steep.
What's the current humidity level in your basement, and where is the water coming from - the ceiling, the walls, or the floor?
I had a case in my house where the owner rushed into choosing paint because it was cheaper. Two years later it started peeling off in sheets, and the problem only got worse - water was seeping under the paint and breaking down the substrate. Then we had to redo it anyway, but with a membrane this time, because the paint just couldn't handle the moisture pressure. If the basement is relatively dry and there's minimal moisture, paint can work as a temporary fix, but with serious dampness a membrane really does win out - though it's more expensive and labor-intensive.
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