In case of problem-solving difficult system. Recommend area. Polishing the existing waterproofing and fixing cracks in both air squadrons, then make a new.
System solutions for difficult cases Recommended waterproofing the area, contrary to the existing waterproofing and repair cracks in both the test and then re-waterproofing.
To solve the difficult case system introduced do waterproofing the whole area.Def locating off the original and the crack repair away, then do waterproofing.