I have a year-old townhome with a poured-concrete basement and it is waterproofed on the outside with some kind of green plastic coating (by the builder). I had one crack in an exterior basement wall, which I never saw leak, but got it pressure-injection grouted anyway (just-in-case). We have never had any water leaking or dampness on the inside, even with all the rains this summer (I live near Philly). The basement also has a sump-pump and an under-drain under the floor.
Now we are planning to finish the basement, and the contractor says that we dont need to waterproof the inside (with something like drylock). He plans to put the wood framing up against the wall, and says we will never have any water/moisture problems (we also have a dehumidifier currently in the basement). Is he correct? Should I still go ahead and dry-lock the wall just-in-case? He wont do it, so I have to dry-lock it myself. Or should I just paint it with regular latex based concrete paint?
Also, I found some conflicting advice on the internet with some folks not recommending dry-lok as waterproofing both sides traps the water in the wall and degrades it. Is this true? Also found conflicting recommendations about the use or not of vapor barriers and XPS sheeting.
I'm totally confused and any help/advice will be greatly appreciated.
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