Duradek Waterproof Vinyl Roof and Walking Deck Membrane: Since 1974, Duradek has been installed, by trained professional applicators, on well over 100 Million Square Feet of flat roofs, sundecks and balconies all over North America. Duradek has solved difficult waterproofing problems in the hottest, coldest, wettest and driest climates imaginable. With Duradek's proven system, proven installation techniques and experience, Duradek can solve your exterior waterproofing needs. more... See more text