@baylinor +1
I keep my home at around 50% humidity and the only mold problems are when I've bought secondhand LPs. I do what I can to deal with those, and once I can't smell any more mold, I put them also in outer sleeves, which would eliminate any transfer of the odor.
I use MFSL clear outer sleeves. The method described by baylinor reduces dust and wear to the jacket as well as not interfering with reading the spine. Jacket wear does devalue LPs if you ever sell them, and of course dust is one of the main culprits in record noise.