EPDM Rubber ShrinkSteven Dickinson
Unless Europe has some miracle EPDM I don’t know about after 4 decades as a journeyman roofer; the walls, roof and chimney flashing will all fail within a decade.
The rubber will shrink and pull off the walls, a product that Firestone, Versico aka Goodyear and Carlisle EPDM roofs mandate at walls is called RUSS strip and you didn’t install it.
Preventing EPDM Rubber Shrink
RUSS is a 6 inch wide 60 mil roll of heavily reinforced EPDM that sits flush at the break in the walls and deck. It gets screwed and plated every 8 inches, then your field sheet of rubber is glued directly to the RUSS stripping before being rolled up the wall as flashing.
RUSS completely eliminates the natural shrinkage of the field sheets from pulling the rubber off the walls, in USA RUSS is also used around all penetrations such as soil pipes and such.