Question: Hi Robert: Reading your column, about the gentleman who is going to epoxy his garage floor, prompted me to write. I too would like to apply epoxy to my garage floor, but I have another problem. In addition to cracks in the concrete, my floor has efflorescence caused by moisture. How do I c orrect that before applying epoxy? Thank you for all your information.   – Jim B.  Answer: Jim, thank you for writing in and being a loyal reader. What you need to do is apply a liquid vapor barrier (same as is used when tile setting on slabs, when moisture issues are present) prior to applying the epoxy system, and that will lock in the moisture and keep it from pushing the system up. Best of luck. BTW, this can be purchased at your big box stores.  Robert Lamoureux has more than 40 years of experience as a general contractor, with separate licenses in electrical and plumbing contracting. He owns IMS Construction Inc. in Valencia. His opinions are his own, not necessarily those of The Signal. Opinions expressed in this column are not meant to replace the recommendations of a qualified contractor after that contractor has made a thorough visual inspection. Email questions to Robert at robert@imsconstruction.com.      The post Robert Lamoureux | Why you need a liquid vapor barrier  appeared first on Santa Clarita Valley Signal. ...read more read less