So in my last update I showed how I framed the floor (here) of my Tiny House and the next step was to insulate the floor cavity. When you frame the tiny house, most people frame it so that it hangs off the edge of the Tiny House on most of the sides. This creates a gap between the framing and the actual trailer. So we use expanding spray foam to close it up air tight. This foam creates a water and vapor barrier.
One major tip I can give you if you are using this stuff, wear latex/nitrile gloves that you can throw away. If this stuff gets on your skin it literally will not come off, even with paint thinner, goo gone, pumice soap, or any other trick you have in your book. You basically have to wait for your skin to wear off. trust me, I know!
First off, this is what I started with, the floor framed, beneath that you can see the white vapor barrier and that is covering the metal flashing. Then I sprayed the expanding foam into all the cracks to seal it up. From there I will be putting in the foam board, which I will show in my next update post.