[Greenbuilding] concrete radiant floor leak

[Dick Gallien]

Poured a 2,000 sq. ft. radiant floor, with pressure on the tubing and it has worked fine for 4 winters. Gambled last winter, pouring a 44'X40' garage floor, with no pressure.  The tubing is on 2" of foam, covered with 2" of sand and 5" of concrete.  One of 4 loops must've been completely severed, since air goes in, but none makes the loop.  I heat the building with an uninsulated outdoor woodboiler inside the building and have plenty of heat, but has anyone heard of a way to pinpoint the break, so I can saw through the concrete and splice the dead loop?

Thanks, Dick
 
Dick Gallien  
22501 East Burns Valley Road
Winona  MN  55987
dickgallien at msn.com  [507]454-3126
www.thewinonafarm.com