Thanks, all-
yes, EPS (expanded polystyrene) and XPS (extruded polystyrene)
are the two that are permitted around here. But by abandoning
the internet and picking up the phone, I discovered that the local
inspectors/installers etc expect to see XPS, even though it's slightly
worse at resisting water. EPS looks too much like styofoam packing, I guess.
So what I ended up with was Dow type IV XPS with a 25 psi compressive strength.
The local insulation wholesaler for Dow (Apec, in Kent, WA) recommended it for what I'm doing
and beyond, and were happy to sell me 60 sheets and fork it into the pickup and onto
my trailer, and even gave a hand lashing it all down. It was quite a bit cheaper than the lighter
(15 psi) stuff at the big boxes, too.
Now I'm off to compact and re- level the gravel one more time, and then start checking
my work to see if it's all level(ish).
Then vapor barrier, insulation, remesh, tubing, 2500 zip- ties- and concrete.
I should be done by lunch, right?
t
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