I am looking to buy a Roof Window size 114 x 140. The roof tiles are plain tiles, when I looked at the EPW flashings the list did not have an option for the same size? A roof window size of 114 x 140cm is a STANDARD SIZE 11, as shown in the product selector, along with a flashing size 11 EPV for plain tiles. The EPW is for use with the side hung range of windows and cannot be used on the FTP Range. Have more questions? Submit a request 0 Comments Please sign in to leave a comment.