Radiant floor tubing layout???

[falcon428]

I have decided on putting in radiant heat in the floor of the new shop, my question is that I want to do the install myself, I need help in layout of the loops. MY building is a 60'x140', I am going to break this into two sections, a 60'x80' and a 60'x60' section. I am only planing on heating the 60'x80' at this time, but due to expansion down the road I want it in floor just in case.

Is there anyone out there that installs this professionaly, that could guide me in the right direction? I have seen alot of different ideas on what is ccorrect, 1/2" line 12" spacing to 5/8" line 18" spacing on loops. Some have said no longer than 300' loops others have said up to 500' loops? I only have one chance to do this right. I have talked to a couple of local contractors, but they dont want to elabirate on details, cause they need the work right now.

I hope to get the foundation started next week, so will be needing something soon. Sorry for being so last minute, but the more I read on here the more I wanted it.

Thanks!!

 

[ScaldedDog]

I did mine in 1/2" PEX, nominally on 9" centers, but actually some were on 6" centers and some were on 12". I was attaching it to wire mesh with a 6" grid, so that was the easiest way to do it. I read a lot before doing it, and found design guides by Infloor, Radiant Floor Company and Zurn helpful. Of course, a lot of what I learned came from this site. BTW, my space is 34x32, if that matters.

My opinion is that the exact layout is less important in a garage than it is in an occupied space. The same things that would drive you nuts on a bathroom floor, like hot and cold spots, are no big deal in a garage. Just keep it uniform, keep the lengths under 300' and as close to the same length as is reasonable, and you'll be fine.

My $.02, offered for free and worth every penny,

Mark

 

[Possum]

The first thing you need to do is a heating load calculation on the building. I would say that if you were in a hurry and don't have some time to educate yourself correctly, pay an engineer to design a system so its right and then you can source your parts and do the install yourself.