Ok. So i got the greatstuff shaved level with the floor and now just need to seal the small cracks with Butyl Rubber Caulk. I got most of the IR blocking sheets up, just need to aluminum tape the joints, and put some up around the vent after I put my ducting and fan (attic cooling only) on there.
After I seal up the small cracks in the floor, I am going to paint it with the elastomeric roofing compound. After the rest of the walls are up, I am going rubberize them too, and seal all corners, lay styrofoam down, and plastic off the bottom for water spills. I am going to get a non hardening sealing compound to seal the rim of the plastic sheeting to the lower part of the walls, this will keep it sealed water/air tight.
I like this coating because I can clean it with bleach and water without harm to the surface, it seals up micro pores in wood that paint can't, and it is reflective white.
I tested some on a scrap piece of wood I had and it hardens totally and seals nicely.
After hardening and curing for a day, I dropped it in a pan of water and let it sit overnight, and when checked in the morning, it had not soaked through at all!! Great
