32x40 New Build Radiant slab layout

matouse3 · Feb 19, 2012

Attached is my proposed layout for my new garage (to be started this summer). I know the 5th line is a bit long, but I plan to just increase the spacing slightly for that run and just go with it. I like this design as it has the warmest water running on the outside of the building (fresh from the supply) and has the outside spacing at 6inches, increasing to 12inches on the center runs. I wanted to get some comments and feedback on this and see what other thought.
Thanks in advance.

Bondo · Feb 19, 2012

Ayuh,... What's yer floor plan gonna be,..??

Maybe breakin' it into 2 or more zones can be to yer advantage...

matouse3 · Feb 19, 2012

I'm going to have 2 garage doors at the top of the image (on the 32ft side) and another garage door at the back right of the image (on the 40ft side). The reason I'm keeping it one zone is because I plan to have a second floor (gambrel trusses) and will have a second zone in the joists of that floor. I think keeping it all one zone on the bottom will give me a more uniform heat throughout the building and upstairs.

matouse3 · Feb 19, 2012

Here's the floor plan. If anyone has any comments or suggestions I would love to hear them. The roof will be Gambrel and provide a 15ft by 40 ft room in the upstairs. I have yet to contact my contractor to get a requote for the changes I have made since I first talked to him, so I would love to hear some comments if you have them before I do that.

rburke65 · Feb 22, 2012

I'm looking to put up a 32x56'. I just might steal that lay out, if WE don't get any negative feed back. Thanks. What size pex are you installing?

matouse3 · Feb 22, 2012

I'm running 1/2". I have asked the question of 3/4" vs. the 1/2" and I think I have decided to stick with the 1/2". Its less money (but I need more of it) and I can use the 6" spacing on the concrete wiring to attach it at 6" on the outside and 12" on the inside.

TJTHEFITTER · Sep 17, 2012

Just wanted to say that's a nice layout map my boss's don't even give me ones that easy to read some days haha

BadgerBoilerMN · Sep 25, 2012

You are working too hard at this. There are a few accepted patterns used by radiant floor engineers and designers, but this is a new one. I know it is faddish to tighten up the outer loops...not sure why, but is is rarely called for (needed) or beneficial in a steel building. Unless you are going to be opening doors a lot or have an unusually large window a 6" tubing pattern is just a waste of PEX.

Tubing patterns are properly dictated by heat loads and comfort issues, neither of of which are a concern in this forum given the typical construction of garages or shops.

Keep it simple. A standard serpentine pattern will give you a thermal gradient with less differential than the one you have painstakingly invented here. Loop lengths are more important for the goals you are apparently trying to achieve.

matouse3 · Sep 25, 2012

I didn't work THAT hard at this. This is the layout that I decided to go with after I did my research. It made sense to me, but to each his own. Its not a steel building either, if that makes a difference.

You're right, probably could have done something much simpler and been fine. I just wanted to share in case someone else was looking for a similar pattern so they would have to go though the trouble of laying it out themselves.

dallasjeannie · Jun 5, 2016

I am interested to know about your results with the radiant floor heat. I think I may have a few questions for you too, if you will respond.

32x40 New Build Radiant slab layout

matouse3

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Bondo

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matouse3

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matouse3

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rburke65

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matouse3

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TJTHEFITTER

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