Four inches of pea gravel. The discoloration is due to the gravel being slightly damp from the previous day's rain. Note the hand tamper: that was a lot more work than I'd anticipated. If the space had been bigger, I probably would have considered renting a gas-powered tamper.
The next layer up is the 6 mil polyethylene vapor barrier. However, before I installed that, I pre-fit the first layer of foam (1-inch thick) and cut holes for the pipe penetrations. This photo shows how I used the foam as a template to know where to cut the vapor barrier for the pipes.
With the poly in place and stapled up the wall, I taped the vapor barrier around the pipes using Zip Tape. I don't have a picture, but the corners are folded like Christmas wrapping but on the inside. Since the goal is to make the poly as air-tight as possible, it's better to avoid cutting: hence the corner folds.
This shows the second layer of 2" foam in place at the other group of pipes. At R-5 per inch, this provides a total of R-15 under the radiant slab.
Practically done: The joints have been taped, and spray foam has been added around the pipe penetrations. The last thing to do is glue the side foam panels down and tape the side joints. It was only a matter of a couple hours until the first load of adobe mix was flopped down and leveled. More on that next....
No comments:
Post a Comment