Radiant Heat Concrete?? Manuals

Does anyone know of any good resources (books, websites, or Manuals) that I can read to learn more about designing and installing an in-concrete radiant floor heating system in a metal building? Any guidance would be helpful and I will be grateful for the help.
Hope to hear from you soon.
Rolfsi

http://www.radiant-floor-heating.com/hydronicexplained.htm

http://radnet.groupee.net/eve/ubb.x/a/cfrm/f/2771065301

http://www.healthyheating.com/

http://www.healthyheating.com/bb2/index.php

http://www.radiantdesigninstitute.com/page2.html

http://www.greenbuildingtalk.com/Forums/tabid/53/view/topics/forumid/12/Default.aspx

http://www.bellgossett.com/homeowners/BG-Hydronics101.asp


the bible of radiant heating:

http://www.nwbuildnet.com/stores/bookloft/carp/gen/rfh.html