Method and apparatus for applying foam plastic materials to a roof deck

Apparatus for applying foamed plastic material on a roof substrate along a path having a direction and between first and second support means laterally spaced apart with respect to said direction for supporting the apparatus spaced above the substrate for movement along the path on said support means, said apparatus comprising, platform means having opposite ends with respect to said direction and laterally opposite sides, endless belt means on said platform means, said belt means having laterally opposite sides spaced apart a distance greater than the space between said first and second support means, means supporting said belt means on said platform means for displacement relative thereto in the direction between said opposite ends, said belt means having a top flight and a bottom flight, means on said platform means for driving said belt means for said top flight to move in the direction from one of said ends toward the other, means on said platform means adjacent said other end for dispensing expandable plastic foam material onto said substrate, and said bottom flight being spaced below said platform means and engaging said first and second support means for said support means to support said apparatus spaced above said substrate for movement along said path.