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Radiant Floor Heating/Spacing between 7/16" steel pipes in concrete


Hi Morgan,
In regard to the mid-50's steel pipe hydronic system in California (Racon mfg.) I told you about earlier this month, I wonder whether you could give me a typical spacing between the back and forth runs of 7/16" steel piping and also the typical depth in the concrete that the pipes would be located. I ask because I am in need of finding one piece of good pipe so as to make jump a patch in the area where a rust-out has occured, but I don't have a picture of how deep to dig in the concrete and how far crosswise I would need to go before finding the next "run". Is there anyway of detecting the steel pipe location in a empty/cold system?
Thanks for any suggestions you might have.

Empty and cold, not so much. Full and hot with a few windows open and a wet spot with hot runs easy to find with an infrared thermometer.

I have inspected many old radiant slab homes with leaking pipe finding everything from one inch iron pipe to 2" copper on 4 to 16" centers placed from below the slab to, and inch below, the surface of the concrete.

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Morgan M. Audetat


Radiant panel heating design, including floors and ceilings, European wall panels and snow melting for residential and light commercial buildings..............................................................-Master of Steam and Hot Water,City of Minneapolis....................................................--- Master Plumber, State of Minnesota...........


30 years..... Charter Board Member - Radiant Panel Association, former manufacturer of condensing boilers, former national distributor of radiant floor products, son and apprentice of mechanical & plumbing contractor. Current mechanical/plumbing contractor specializing in hydronic based, integrated HVAC systems. Radiant floor heating/cooling. Snow Melting. Condensing Boilers. Indirect water heaters. System design, consulting and technical training world-wide. Licensed contractor, designer, installer and consultant.

B.S. University WI 1981 CONTINUING EDUCATION: Viessmann Condensing boiler and Solar water heating certification 2010, N.D.S.U. Lead Worker RRP certification 2010, Knight condensing boiler certification 2009, Wrightsoft Manual J CAD certification 2009, RPA Designer & Installer Certification 2008, Nate Hydronic/Forced Air Certification 2008, Uponor/Wirsbo advanced design school certification 2007, Buderus Wall-hung certification 2007, Power Limited License (low voltage controls) 40 CE credits 2005, Basic Hydronic Certification IPEX & Northern Alberta Institute of Technology 1998, Charter Board Member - Radiant Panel Association 1994, Residential Off-Electric to Hydronic Conversion Heating School Canadian Hydronics Council 1994, B&G Little Red School House 1993, Rood Utilities (now Auburn Technical Institute) Oil Burner School 1993 ,Tekmar Controls residential and commercial 1993, Division Manager and Advanced Hydronic Seminar Instructor for the first Exclusively Hydronic Radiant Floor Distributor in the USA 1990, Hydronic Radiant Heating Association Workshop participant with Richard c. Bourne, PE spring 1988, Master Plumbing, Hydronic, Solar Course Red Rocks Community College 1987.

Awards and Honors
2009 System Showcase Award - Radiant Panel Association

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