I have a central heating system based on PP-R piping and radiators. The PP-R piping goes under the floor. The problem is that the pressure is droping 0.2 atm / week and I am sure there's a leak somewhere under the flooring.
I was wondering if anyone has heard of some sort of sealing substance that could be injected into the system? I've read about something similar for copper piping, but can't find anything related to PP-R, don't know if it would be even possible.
I really don't want to remove the flooring in order to fix this, due to costs, so I am considering this as the ultimate solution.