Stormin, I would use fiberglass, not that chopped up newspaper crap they call cellulose insulation. It can be blown into that space. Look in the yellow pages and see if you can find an insulation company that specializes in insulating hard to access places. I did that about 9 years ago. I cut openings in the tops of the outside walls on either end, and we taped the insulation blower hose to about 30 feet of 3/4" pipe to use as a long handle. They carefully inserted the hose all the way in through the opening, and slowly moved it side to side as they pulled it out. I am sure they were not able to get 100% coverage, but the did manage to get a bunch of insulation in. They showed up in a pickup full of bags on insulation and a trailer mounted machine-- they had only a few bags left over afterward. Cost was $300. MH was slilghtly smaller than yours-- 12x63. I did use cellulose (didn't know any better then), and have had no problems at all. However, the MH was over-roofed with R panel, so virtually no chance of any leaks. If cellulose ever gets wet, you can have serious mold problems. BTW,the insulation made a huge difference in heating and cooling. Larry
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18 years ago