It discloses a procedure and device to provide a foam insulating product, based on normal or anti-static latex, which especially good use can be made of as a thermal and acoustic insulating material, and also as a waterproofing and sealant material to be positioned directly on the constructed floor, under the parquet, laminated floor, floating floor or similar material of the floor of a home or other enclosure. The manufacturing procedures consists of a succession of phases as is conventional in the foaming processes of these materials, to which a support film provision phase has been added, of plastic or aluminium material, directly positioned on canvas conveyor (1), so that the foam compound (6) is directly poured on said support film (7), and a phase to provide a flange (13), longitudinally extended throughout the entire edge of the insulating product (9) and attached thereto by sticking. The device additionally includes a support film feeder (8), together with a film tightening device (12) to avoid creases from forming there, and means of provision and sticking of said side flange. The tight bonding between the film and the latex-based foam material is produced in the vulcanization and drying phase inside the corresponding furnace (4).