The Dow Chemical Company

Dow Global Technolgoies LLC

Michael J Ennis

Kyung W Suh

Daniel D Imeokparia

Creston D Shmidt

Trevor Wardle

Creston D Shimdt

Affix a membrane roof cover structure, comprising a polyester foam layer and a new membrane layer, over a roof deck structure such that the polyester foam layer is between the roof deck structure and the new membrane layer.

Application of a membrane roof cover system having a polyester foam layer

Open-cell foams in roofing systems

Disclosed is a roofing system for a structure such as a building. The system comprises a roof deck; a plurality of panels of an extruded alkenyl aromatic polymer foam above and adjacent the deck; and a substantially waterproof membrane above and adjacent to the foam. The foam has from about 30 to about 80 percent open cell content. The foam provides excellent mechanical support for the membrane, and is water resistant. The foam further has a high heat distortion temperature, and is substantially free of distortion at high service temperatures encountered in roofing systems. Further disclosed is a recovery roofing system employing the above foam. Further disclosed are processes for constructing a new roofing system and a recovery roofing system.

Method of employing an extruded open-cell alkenyl aromatic foam in

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Reynoldsburg, OH, United States of America

Michael J Ennis