If you are at this point you have hopefully read through our recommendations on how to check out your existing roof and prepare it to receive a new roof. Choosing what type of roofing system involves a lot of factors – existing substrate, functional requirements, warranty requirements, cost sensitivity and building codes. A 10+ year system would involve installing a new comprehensive waterproofing layer, possibly with additional insulation or substrate separation layer at a low cost. The difference between a 10-15 year warrantied system and a 20-30 year warrantied system is the 20-30 year usually has a thicker waterproofing layer, may have added redundancy at key future failure points like flashings or the roof edge, may require it be the only roofing system installed and the warranty costs more per square foot. 90% of our customers are happy with the 10-15 year warrantied system.