First-time poster, and first-time homeowner here, so be gentle:
I'm getting ready to install 12mm hardwood laminate on concrete slab, and had a subfloor moisture test done. The test came back at 13%; the contractor doing the testing said that over 4% would require a liquid moisture barrier be put down prior to installation.
A few questions:
-I've had one person tell me that up to 18% is acceptable, and that a normal moisture barrier is sufficient in my case. Is this true or false?
-If a liquid moisture barrier is needed, what am I looking at pricewise/laborwise if I apply it myself? The contractor today suggested I would have to contract it out at great expense.
-Lastly, what are your recommendations for a liquid moisture barrier?