FOAMULAR® 404 and FOAMULAR® 604 extruded polystyrene (XPS) insulations are specially designed for use in Protected Roof Membrane Assemblies (PRMA), where the insulation is placed directly over the membrane. The compressive strength of FOAMULAR® insulation provides the integrity needed for long-term roof performance. FOAMULAR® insulation is produced by Owens Corning’s patented HYDROVAC® process technology under conditions of strict quality control.
Extruded polystyrene is the only type of insulation recommended for PRMA applications. Owens Corning offers four specific types of FOAMULAR® insulation for this use: FOAMULAR® 404 & 604, both featuring drainage channels on all four bottom edges; and FOAMULAR® 404 RB & 604 RB. FOAMULAR® 404 RB and 604 RB have four bottom edge drainage channels, and drainage channels running the length of the panel on the top surface as well.
With a minimum of 40 psi compressive strength, FOAMULAR® 404 insulation meets the needs of many
PRMA applications. For even greater strength, specify the 60 psi compressive strength of OAMULAR® 604 insulation. Both products feature rain channels on all four bottom edges to promote drainage below the insulation.
FOAMULAR® 404 RB and FOAMULAR® 604 RB insulation products are used when the insulation is to be placed directly beneath concrete or other types of paver blocks, eliminating the need for pedestals resulting in significant labor and material savings. These high compressive strength, high durability products are used as the insulation layer placed under the ballast of the PRMA roof and offer excellent drainage characteristics because they’re manufactured with
channels that are cut in the surface of the foam the entire length of each panel. Coupled with
the standard bottom-side rain channels, the top side channels help drain moisture away from the
underside of the paver to protect it from freeze/thaw cycle damage.
Manufacturer: Owens Corning
For More Information on the FOAMULAR® 404, 604, 404 RB & 604 RB Extruded Polystyrene (XPS) Rigid Foam Insulation, [Click Here]
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