With our most advanced line of skylights, we promise you no leaks, no worries and we back it up a 20 year on glass and a 10 warranty on parts and labour. The No Leak skylight line offers 3 layers of water protection with all these deck mounted skylights and associated flashing systems. First, VELUX introduces a third layer of water protection in the pre-attached deck seal that provides a seal between the frame and roof deck for a leak-proof installation. Second, an adhesive underlayment provides secondary water protection against the harshest weather conditions. Third, VELUX offers engineered flashing for easy installation and primary water protection on a full range of roof materials. See
The No Leak Skylight brochure.