http://www.AsktheBuilder.com founder, Tim Carter, shows the complex method of looping Uponor hePEX tubing in between framing that's 24 inches on center. SEE IMPORTANT LINK NEXT: Three heat transfer plates are in each truss bay, not two. Tim offers PHONE COACHING should you need help: https://shop.askthebuilder.com/15-minute-phone-or-video-conversation-with-tim/