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Floor insulation...
Another thing that I forgot to mention here is a note about how I intend to insulate my floors. I like the approach that Boatdoc is taking with the foil under the floor and would use that technique myself except for three reasons.
The first is that I have not actually removed all of my belly pan and don't intend to if I can avoid it. The belly pan for the front half of the trailer is in really good shape and I did not want to have to remove it. I also was able to replace my floor from above in those areas. I used a product called Polyboard by the way. If anyone is interested in checking that out do a search by that keyword and I think you will find postings about what I did.
The second reason is that a lot of my underfloor space will have holding tanks of various types in them. The fresh water tank on a 1973 31' unit takes two of the floor cavities under the kitchen area. I intend to add a combination black and grey tank in another cavity just behind the rear axels. If I don't go with the combo tank I would put a black water tank in another cavity. These tanks are a bit in the way of underfloor insulation technique. Yeh, I know that I need to provide some insulation for my tanks too and that would help.
The other reason is that I am still thinking about putting hot water radiant heating on top of my floor. If I do indeed take that approach what I was intending to do was to put down a layer of reflective foil on top of the floor and put PEX radiant heat tubing on top of that. It is not as good of a solution overall as putting the foil under the floor but I thought it would serve my needs OK. It should work pretty well to prevent heat loss and not quite so well to prevent heat gain in hot weather. the extra air gap because of the radiant heating will help some though. I still have to decide what type of flooring to put on top of the radiant heating. I do have about 200 square feet of some 3/8" thick tounge and groove brazillian koa wood flooring left over from another project that would look awesome. It would not be as durable as something like laminate flooring though. Also the koa wood needs to be or glued down and I would prefer something that floated. We shall see about that one...
Malcolm
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