The newer Hospital building is approximately 10 years old and already having problems with a number of leaks on the flat roofed areas. The original 'single ply' membrane on this stairwell roof had failed in several places. We applied the Kemperol 2K-PUR solvent free system with great success in April 2010 and there have been no further leaks despite a substantial amount of rain since then.Before and after photos below.