"Single-ply roof membrane" means a prefabricated single sheet of rubber, normally ethylene-propylenediene terpolymer, that is field-applied to a building roof using one layer of membrane material. The term does not include membranes prefabricated from EPDM.
N.H. Admin. Code § Env-A 1204.28
(See Revision Note at chapter heading for Env-A 1200) #9933, eff 6-1-11