I can get schedule 40 pipe with holes in it? Sounds cool.
Bill, are you recommending installing the pipe, holes down, with no layer of clear gravel or geotextile around it?
I would love to say forget the pipe, and may still go that route. However, I would also love this patio to last and would despise having to reset any of those 600 lb stones with 800 lbs of cement around them. That would really STINK!