hi guys question for the epdm fitters on here,just had a rep show me a dvd of an epdm roof being fitted seems straightfoward enough! but one thing i didnt get is what do you use to create the raised edge at the verges? is it a square timber batten(size?) as opposed to the normal angle fillet we would use on a built up felt roof? the dvd player he had only had a 7inch screen and i didnt have my glasses with me! many thanks