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Radiant floor question


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By Marsha in Frankfort, KY on 6/25/2006


We are ready to lay the PEX tubing for our radiant floors in our basement slab. My husband helped a friend lay his and the friend is planning on helping us in return. The friend has planned the layout for tubing and is recommending 4,500 ft of 3/4 inch tubing for our 2,600 sf slab and 949 sf garage. He is also recommending that our loops are no more than 8" apart. Does this sound right? I think it sounds like a lot of tubing! I plan on calling Radiantec in the morning (I've left several messages already - I think the rep for our area is out of town). Just wondered if anyone could give their opinion!

Thanks!
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By Tom in Stroudsburg, PA on 6/26/2006


3/4 is used for snow melt applications, do you mean 3/8? that would be more in line with what I would expect to see in a basement slab.


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By Marsha in Frankfort, KY on 6/27/2006


Thanks Tom!

Our friend is suggesting 3/4" and the loops 8" apart, but my husband believes that we need 3/8" for the loops to be 8" apart based on what he has researched. We just seem to be getting different answers from anyone we ask! Basically, what we would like to know is the recommended diameter size of the tubing and how far apart to space the loops? We are hoping to be able to work on installing the radiant floor this weekend. Any advice would be more than welcome! BTW, I found a supplier on eBay selling PEX for 17 cents/ft!
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By Jon in Ellicott City, MD on 6/27/2006


3/4" tubing on 8" centers sounds like WAY too much tubing to me - especially in a basement slab. I wouldn't go any tighter than 12" with 3/4" tube. You might even put it on 16" centers, but I'd confirm that with your RFH supplier.

I'm using 1/2" tube and placing it 12" on center. Of course, I haven't completed the house yet, so I can't confirm that my tube layout is sufficient. I can say that, based on research and the experience of friends, I'm reasonably confident that 1/2"x12" will be fine.


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By Tom in Stroudsburg, PA on 6/27/2006


link to previous post: ownerbuilderbook.com/forum/messages.

A factory rep and a system design become useful at this point. It's helpful to have it professionally done so you know what size boiler to buy.
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By Tom in Stroudsburg, PA on 6/27/2006


One other note; 3/8" tubing should be limited to 150' runs, cut all your runs the same length, it will make balancing the system easier.
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