FOAMULAR® 404 & 404 RB Extruded Polystyrene Insulation

ASTM C578 Type VI, 40 psi, 1.8 pcf density

Foamular 404

FOAMULAR® 404 & 404 RB extruded polystyrene 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® extruded polystyrene insulation provides the integrity needed for long-term roof performance. Extruded polystyrene is the type of insulation recommended for PRMA applications. Owens Corning offers four specific types of FOAMULAR® extruded polystyrene insulation for this use: FOAMULAR® 404 and 604; and FOAMULAR® 404 RB and 604 RB. Both the 404 RB and 604 RB extruded polystyrene insulations feature drainage channels running the length of the panel. These are excellent extruded polystyrene products.

Owens Corning’s FOAMULAR® extruded polystyrene insulation is an ENERGY STAR® qualified product.

Thickness Width / Length Edge Type
2", 3" 2' x 8' Rain channeled on all bottom edges

Ribbed  FOAMULAR® 404 board is made-to-order with minimum order quantities.

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Other sizes/edge configurations may be available with minimum order.

We recommend FOAMULAR® 404 & 404 RB Extruded Polystyrene Insulation for the following applications:


Product Overview