u/Blarto

https://preview.redd.it/3resranw3jzg1.png?width=1306&format=png&auto=webp&s=54c9420357979c033f47cf610177454ff0d4807f

I'm building a back yard office and it will have a window AC/Heater for climate control. I have the piers poured already and I have a big pile of rocks and stones. I live in a fairly dry climate, Northern Nevada. Each of my questions has a vapor barrier option so I guess the main question is where should I put the vapor barrier?

  1. Should I put the stones under the floor on some weed barrier or should I put some plastic down as a vapor barrier?
  2. I'll be insulating the floor, should I use rock wool batts or xps foam and seal the edges with expanding foam.
  3. to protect the insulation from the bottom is plain osb fine or should I get some 1/2" zip sheathing and do the water proof side down.
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u/Blarto — 8 days ago