Helping our Condo HOA evaluate roofing bids and they are all over the place with different materials and fastening. This is a garage attached to a multi story condo building, located in Montana (so can have high snow load and some big temperature swings).
We have quotes for TPO and EPDM with both fully adhered and mechanically fastened. The fully adhered options are generally 25% higher cost, so first question is whether there is really that much better of an installation to justify 25% cost adder for FA?
Second question is TPO vs. EPDM. As I understand it EPDM may be better for our weather but the joints arent as durable? The EPDM options are 5-10% higher cost than TPO