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Al soffit as PEX support?

 
                                    
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I'm trying to be frugal and green. I'm pondering reusing old Aluminum soffit material to support my PEX tubing between my floor joists. Does anyone see a problem with doing so? Thanks!
 
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Does it have a shiny ,reflective side ? If so it should work OK, especially if it is going into a downstairs ceiling. I usually use staples (rented staple gun) or 1/2" pipe clamps to hold the PEX up tight to the flooring for max conductance of heat through floor. Then I put reflectix suspended min. 1 in. below PEX to reflect the heat upwards. Its also important to keep dust/debris off any radiant barrier as it will impair its ability to reflect. I staple up 4 mil poly on bottoms of joists during construction to prevent this. 
 
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