I am going to replace my carpet with Engineered hardwood floor(the choice would be Kahrs floating installed floor). The problem I am facing is my baseboard is thin. It's not able to cover the expansion gap required by the floor manufacture. I think this is a very common problem, most floor manufacture requires 1/2" expansion gap but most baseboards nowadays are 1/2" or less .
My current baseboard is short and thin. It will be very silly if I use quarter round to cover the gap. So the only way seems to me is to undercut the drywall so there will be enough expansion gap. Now my question is if I undercut the drywall, will the moisture come from the wall through the cut and affects my floor much?
Best Answer
You can but the if its an exterior facing wall you'll likely cut the vapor barrier if you don't use the proper tool. I recommend the Fein Multimaster for this. It has a depth stop gauge attachment so you cut just enough of the drywall without penetrating all the way through. The segment saw blade is best for this. A ton of companies are making knock offs of this tool that you can find in big box stores now so they may work too. Fein is going to be more expensive but it lasts decades.
Another option to consider is to just pull out and replace all the baseboards with something thicker and looks better than what you have now. If you choose this option heed my advice and pre-prime, if not already, and pre-paint all the boards with no less than two coats before installation. You'll still have to apply a final coat after installation to cover nail holes, but you can go extremely fast because you've already pre-painted.