One other thing, as to posting separate questions to separate threads, that concern the same system, just add a link to the question in the main thread.
This thread is connected to.....
Trenched Foam vs insulated pipe.http://nepacrossroads.com/about33334.html
Sometimes another member needs the information contained in a thread but can not find it buried in 30 pages of a thread so posting multiple questions in separate threads helps when searching for the needed information.
One message board I am on has a thread that just kept going with multiple projects and multiple questions, it had some very good information in it, but was a pain to find it. The Moderators eventually separated the information out into threads of it's own and locked it. That started the MB's Tips and tricks forum.