DIY Hydronic Installation

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Can anyone advise me on the installation of hydronic coils before a slab is poured ?
We are building a new home and I have costed the Rehau 16mm PEX totalling $6,000 for 550 sqm. This is working on 5m per sqm equalling 2750m.
On a sqm basis this is approx $11 however every quotation I have received is approx $50-$55 per sqm to supply & lay the pipe prior to having the slab poured.
So it will cost me upwards of $21,450 for the installer to design the layout and attach the pipe to the mesh prior to the pour !
As it cannot be rocket science and well worth the savings are there any DIY guides available for potential pitfalls and design etc.
Thanks in advance...
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You got it Buck Rodgers............so take the Rocket and start tying the hose to the mesh

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Just remember, when you do it wrong...
IT WILL BE VERY EXPENSIVE TO REDO!!!!!!!!!!!
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On Sat, 14 Apr 2007 00:54:42 -0500, kjpro wrote:

Not WHEN but only IF
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I looked on Amazon and there is at least one book on radiant floor heat. Also, Fine Homebuilding or the Journal of Light Construction might have articles on it. You're right, it isn't rocket science. You will need to come up with a design, though this typically is tubing run 12" oc and no loops over 300 feet. I think the reverse spiral is the prefered layout. I prefer to staple the tubes to the foam and put any reinforement over the tubes--this lessens the chance of a tube floating up and later being hit by a drill or something. Good Luck.
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On Sat, 14 Apr 2007 04:40:01 -0700, marson wrote:

Thanks for the pointers, after much research I am confident to proceed.
After reading many of the replies to this thread I can also appreciate why many would consider this "rocket science" however most of these individuals would also consider the complexity of tying their shoe laces rocket science.
DIY at www.radiantcompany.com/
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On Sat, 14 Apr 2007 02:52:33 +0000, mchenry wrote:

Found this that may be of use to anyone in the same situation as me... thinking of DIY :)
www.radiantcompany.com/manual/Manual-Edition8.pdf
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wrote:

Think about it junior. $21,450 to do your job. A lot of money? I wonder why? You're thinking $11 per sqm but low and behold all the professionals are right about the same at $50 to $55 per sqm. Gee, maybe they all got together and fixed their prices just so they could screw you? Seems logical.......................you dolt. Keep this in mind. YOU are going to design and install your own $21,450 job that of which you have never done before. I hope you understand how much fun busting up all that concrete and redoing it again the right way will cost. It ought to make $21,450 look like pocket change. Bubba
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Please provide example of a screw up that would cause a slab with radiant heat to need to be jackhammered up.
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do your own homework... and as far as the screw ups?? you'll find out soon enough when you DIY. Its no rocket science, its more complicated than that.
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examples of screw ups?
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lengths, placement, attachment, depth, insulation, ignornace, stupidity, etc. and once the slab is poured, if there is a problem, your fucked. If its done by a pro, they have insurance to take care of their mistakes, and they will make it right on their dime.
Now go piss up a rope and suck on the bitter end.
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Well, I am a contractor, not a plumber. I have personally installed 6 hydronic radiant floor systems. I have two friends who have done their own installs (non-contractors), and can think of about 4 other projects that were done by contractors, not plumbers. All have worked. twice I've installed systems with a plumber working by my side. The plumber was the first to tell me it ain't rocket science. I've never seen pex cracked. I air test mine, though when I did it with a plumber, he didn't air test his. He didn't inspect it for cracks, either. I've read that if you kink pex, it can be returned to it's original shape with a torch. But in the 6 I have done, I have found that kinks are easy to avoid if you use common sense. I've never seen anyone get a kink. If you're stupid enough to put a hole in it while you are installing it, then you truly are stupid. Course, it is possible that it will be damaged during the pour, but that is just as likely as if you had a team of master plumbers installing the stuff. Loose fitting and bad connections only occur around fittings and fittings don't get buried in the pour. Attachment, depth, insulation should be dealt with by the designer. I'm not going to suggest the OP does this cold without some design help. But for a competent DIYer, it's one of the easier parts of the building process.
In the last 15 years or so that radiant slabs have been around my area, I know of two major screw ups. One, a DIYer tried to test a radiant heat system he had installed in an outside slab with water from a garden hose, and left the water in over the winter. Ruined it through stupidity. Another time, a professional plumber on a house I was building fired up the system while the slab was still too cold, and froze a loop, though it thawed and all was well.
telling me to "go piss up a rope" only undermines your credibility.
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Actually not, because you come trolling in here like a homeowner that just thinks he is gonna DIY and "save a bundle" without giving *ANY* indication of your vocation, or experience. This leads us to believe that your nothing more than some computer weenie or even worse, and EE. If your are experienced as you say, then you already know what possible problems your going to run into and how to avoid them.
Now, troll.....I refer you to the last statement in my previous post.
*PLONK*
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and when did I represent myself as a homeowner? You ain't doing your credibility any good here.
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Thank's for making me laugh marson. "Its no rocket science, its more complicated than that" That was a great screw up example. ROFL
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Yours, first hand AFTER you get done with it. LOL
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marson wrote:

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Go over to the OP's and look at his when he is done. That will be one of them. If you've got to ask, yo'veu obviously not installed or serviced any of them and I dont believe you've done 6. I think you may have seen six of them done after you showed up. Ive seen lots of screw ups. The majority of them would be the homeowners trying to do it "on the cheap". That's what makes "Service" so wonderful. Bubba
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