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I really really prefer the heat welded seams you get with PVC. I don't use fibertite but use Flex, marketed through versico as Versiflex. It's a good product. Either membrane will be xcellent however a roof will often first fail from the seams or penetrations. Adhesives with epdm seem to fail before the heat welding from pvc.
Understand that a roof is more than just the membrane. it is an assembly and a process. Is the old roof being torn off. How thick is the new insulation to be installed? Is it going to be tapered? How thick is the new membrane? What types of terminations or flashings are being installed? and on and on. It's hard to compare the two solely on price without looking at all the details involved in the entire project.
cost is also relative to the project as a whole. Now we need to look at more factors than just the assembly, we need to look at staging, access to the job site, height, material and debris storage and handling etc... Have I done jobs for $20 a foot, yet but it's on the high end of the scale and usually a very complex job.
I disagree completely about allowing the contractor to spec the job. I spec 99% of my work and I usually give a much much more detailed specification, for free, than the average architect, engineer or roof consultant. I don't do what's right for the customer, I do what's right for the building. Sure I give the customer their options but I refuse to let them make a bad decision just to save a buck. Does it cost me work? Sure sometimes it does.
I take ALOT of offense to your comment Rodeo, ALOT of offense. I understand what you are saying, there are contractors out there who will purposely cut corners, but to say all are like that is just plain WRONG!
Durol.ast is kind of a joke in my area. Not saying the product is bad, but I have seen some of the jobs and the inspector must have forgotten his ladders those days because there is no way some of the chit I have seen from durolast contractors would pass. KJ as a certified installer of Genflex roofing products what you are talking about is No Dollar Limit warranty that nearly every commercialr oofing manufacturer will issue to their certified installers for an added cost. As for the durolast warranty and what it covers you can find alot of threads in a lot of forums from people sayign that Durolast doesn't often honor their warrantys. I am not for or against this product, just repeating what I have heard.
1985, IB is the only single ply manufacturer that warrants residential, that I am aware of. there may be more, I just don't know. Even genflex wants a surcharge for condominiums.