ROOFTOP® does not require additional waterproofing to prevent leakage. Every ROOFTOP® purchase comes and must be installed with Roofseal®, which is our innovative fitting product that act as a substitute for traditional waterproofing. Besides having a much more affordable price, Roofseal® also have a much longer service life compared to traditional waterproofing (minimum of 15 years) and is more effective in preventing leakage.