Originally Posted by motorhomegypsy
Hi there folks
I have just bought my bus and the question that I have is has anyone sprayed foam under there bus for added insulation
There are many threads here that discuss this in one way or another. The general consensus that I have read is that it is generally not a good idea. Spray foam is not really designed for exposure like that. There could be special products out there that are, but I would suspect they are incredibly expensive.
The most typical method is to either lay down sheet foam on the steel floor of the bus, or to fur the floor up and use closed cell spray foam.