I haven't used Advantech materials yet, but I'm seeing it more and more. Mostly on commercial jobs like banks that are springing up everywhere. Do you have to tape the edges to get the waterproof seal? I just installed some 3/4 T&G subflooring two days ago and it was $17 each. How thick was the Advantech and what does it cost? Usually I just buy a thing of plastic and put it over the subfloor too keep it dry. Then after putting up the walls and getting the roof on, I just cut out the plastic and leave what's left under the sill plates. It's cheap insurance and pretty common around here.
Did you use pressure treated sill plates on your walls? Going with untreated lumber lets you use standard anchor bolts, but then you risk rot or bugs ruining them. In some older homes, I've found that they really go after those sill plates and then work their way up the walls. I've repaired quite a few homes that were built without pressure treated sill plates and find it to be cheap insurance to prevent, or at least, limit the potential for this damage. Did you put down any other type of sealant or barrier under your sill plates?
Congrats on your progress. It's always interesting to see how things are done in different parts of the country.
