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A roofing composition comprising a blend of a thermoplastic elastomer containing at least two polymer blocks wherein one of said polymer blocks is a crystalline polymer block and one of said polymer blocks is an amorphous polymer block, and a vulcanizable elastomer selected from the group consisting

A roofing composition comprising a blend of a thermoplastic elastomer containing at least two polymer blocks wherein one of said polymer blocks is a crystalline polymer block and one of said polymer blocks is an amorphous polymer block, and a vulcanizable elastomer selected from the group consisting of EPDM, butyl, neutralized sulfonated EPDM, neutralized sulfonated butyl and mixtures thereof. The roofing compositions have particular application as roofing membranes (i.e. roof sheeting) or roof flashing materials.

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A roofing composition comprising a blend of: (a) from about 5 to about 95 parts by weight of a thermoplastic elastomer containing at least two polymer blocks, wherein one of said polymer blocks is a crystalline polymer block having a Tm above 40°C. and one of said polymer blocks is an amorphous poly

A roofing composition comprising a blend of: (a) from about 5 to about 95 parts by weight of a thermoplastic elastomer containing at least two polymer blocks, wherein one of said polymer blocks is a crystalline polymer block having a Tm above 40°C. and one of said polymer blocks is an amorphous polymer block having a Tg of 0°C. or lower and wherein said thermoplastic elastomer contains from about 10 to about 80 percent by weight of crystalline polymer block and from about 20 to about 90 percent by weight of amorphous polymer block; and (b) from about 5 to about 95 parts by weight of a vulcanizable elastomer selected from the group consisting of an ethylene, propylene, diene monomer terpolymer, butyl, neutralized sulfonated ethylene, propylene, diene monomer terpolymer, neutralized sulfonated butyl and mixtures thereof.