Question: We would like to enclose a porch with an existing slab, but don’t know if there is a vapor barrier below the slab. Is there a way to create a vapor barrier?
Answer: We recently came across a product called Concrete Treat that is applied to the top of the slab like paint. It seals the pores in the concrete which provides a vapor barrier that is less permeable than plastic that is 6 mil thick. You can learn more about it and order it by searching for Concrete Sealer and Blanket.
If you have any questions you would like to ask, send them to me via email at firstname.lastname@example.org.