Hi any help would be appreciated. I have a pitched roof that terminates onto a flat roof. I recently laid the EPDM on the flat roof and due to the pitch roof sarking boards not being in great condition I overlaid with 9mm osb3 30cm up the pitch so the EPDM had a good surface to bond to. I have went to dry lay the slates and the osb has caused the bottom of the eaves course to kick out about 1" from the pitched roof. Is this acceptable?