One of my customers had a prefab addition on their home, it was all done according to local codes, however the bottom of the room looks like a tailor floating above ground! There are 4x4 posts holding up the perimeter of the room. About 2 feet all around is a vinyl skirt, but there is another 2 feet exposed. IT looks like it is floating. I was thinking of securing cement board around the bottom so it would look more like the foundation of the house.. what do you think? bad or good idea? We have rain and snow here on the east coast (central NJ) so we need it to be able to hold up.any other ideas? If you look under the room you can see all the insulation packed under the room . It just does not look permanent. Thank you for any help you can give me.