I know this has been discussed many times :beatdeadh but I can't find the thread I was looking for. Is there some type of insulation made to go around the bottom of the building between the boards and the steel walls? Like something to fill up the space created by the ribs. I looked around the big box stores and did not see anything and as usual they were as helpful as well you know :banghead3 I thought about great stuff but that would be quite a few cans and usually ends up looking not very nice. Any thoughts?