No moisture barrier placed underneath the concrete

Q: I currently have my floor dug up in my kitchen. I’m trying to find a source of moisture after seeing dark stains in a few spots on my wood floor. So far we have found no leak, but there is moisture in the soil. We have discovered that there was no moisture barrier placed underneath the concrete. Would it be considered standard practice to place a moisture barrier under concrete?

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Does filler make the floor water tight?

Q: We have a few gaps between boards where the filler has popped up. I don’t mind filling it again (and again as needed), but I am wondering if doing so makes the floor water-tight (or as water-tight as it can get). I ask because I love my Scooba floor cleaner, but it can only be used on hardwood with no cracks.

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