i am building a new work shop, rather than pouring a slab, i am building a slightly raised treated flooring system, deck with 3/4" plywood floor,(and some type of easy to clean finished surface) it will be located directly under a fairly new four season porch,16x18, so there is no need for a roof, the floor will only be a few inches off of the ground, QUESTION, should i insulate this floor and if so, how, keep in mind, rodents, pests, etc. i live in new york state. thanks