Ron, thank you for your quick reply. I ran your suggestion by my boss and he says the EPDM would not work well with the built up roofing, that it would cause swelling. I am far from being a roofing expert, what do you think about what he is saying?
Ron, I would love to see the flat expansion joint that you came up with. Ive got a similar situation now Im struggling with, I have an existing sloped roof with 3" polyiso and bur and gravel, and the roof on my addition will simply continue along that same slope....so I need an expansion joint...