PURPOSE: To provide a roof sheet excellent in autohesion by using an uncured polymer compsn. comprising a specific polymer blend, a specific filler, a specific cure package, and a specific process aid each in a specified amt.

CONSTITUTION: This roof sheet is produced from an uncured polymer compsn. which is prepd. by compounding 100 pts.wt. polymer blend comprising about 10-95 pts.wt. polymer selected from polyolefins (or their mixtures) obtd. from 2C or higher monomers and having a crystallinity of 2wt.% or lower (e.g. EPDM) and about 5-90 pts.wt. crystallinity-enhancing polymer selected from the group consisting of PE, PP, poly(ethylene-co-propylene) random copolymer, poly(ethylene-b-octene) block copolymer, and poly(ethylene-b-butene) block copolymer with 20-300 pts.wt. (non)reinforcing filler, about 0.5-10 pts.wt. cure package which can cure the compsn. at 50°C or higher (e.g. sulfur and an accelerator), and 20-150 pts.wt. process aid selected from the group consisting of paraffinic oil, naphtheni oil, wax, and their mixtures.