"Single-ply roof membrane" means, for purposes of 35 Ill. Adm. Code 218 and 219, a prefabricated single sheet of rubber, normally ethylene-propylenediene terpolymer, that is field applied to a building roof using one layer of membrane material. Single-ply roof membrane does not include membranes prefabricated from EPDM.
Ill. Admin. Code tit. 35, § 211.6015
Added at 34 Ill. Reg. 14119, effective September 14, 2010