Sam, you must be getting pretty good with the jackhammer by now. Lotsa work.
Update on roof drainage/leak issues from Maine:
Our house is 3 modules, plus one for the garage and two big ones for shop and barn. I'm still amazed that for all that roof area, covering 100 feet end to end, Terra Dome only gave us one downspout. We've added two more.
The front of the shop has always dripped through the form ties. We (well, the crew we hired) dug up the entire parapet wall (i.e. down to the roof itself) and found 6" of standing water in the trench. There is a drain near, dug that up and found that the "perimeter drain" tube was only 3' long. This is on the front of the house; the single TD supplied drain is on the back. I dug up a small spot along the back, and found damp sand, but no standing water. The conclusion is that our front perimeter drain (at least on the shop) doesn't work. I don't know if the house has a tiny slope back to front or what. We added a perimeter drain the full width of both the shop and barn, plumbed to the drain we added at the front of the shop. We also put some hydraulic cement in to seal the ties. Why this wasn't done the first time, I'm sure I don't know (that contractor is no longer on the job).
What we had before in the added drain was a hole down through the overhang, connecting to a path out for the water. Above the roof, the hole met a T and connected to drain tubing. This pretty much guarantees an inch or so of standing water, that doesn't reach the bottom of the tubes (held up by the T). We eliminated the T and put a rock screen over the hole. Above that we made a rock pit--the perimeter drain pipes just dump into the rocks, which drain down the hole. Any surface runoff will also drain into the rocks.
Since we have had a problem with the water staying *above* the insulation, with the drains below, we also added perimeter drains above the insulation, just sub-surface. I really don't want to have to go in there again. Accuse me of belt and suspenders.
The perimeter drains we dug up and placed are now covered with 3/4" rock, then landscape cloth. Note that rock is not called for in TD plans.
It will take a good hard rain to tell how well this really works. I think a pond liner over the roof and up the walls is a very good idea for anyone building one of these (but somehow you still have to deal with roof penetrations and attaching to the drain pipes). Add more drain pipes.
On a related note, I found some reasonable caps for the plastic culverts we used for roof penetrations. They are called "split end caps". You have to buy the same brand cap as the tubing you use, they don't match up to other brands. These were about $33 each. You can see the one we bought here:
http://www.ads-pipe.com/pdf/en/ADS_Product_Catalog_06-07.pdf
Look on page 15. They are sized by inside diameter of pipe.
Steve