▎ 摘　　要

NOVELTY - Polymer foam insulation board (1) has a foamed polymer layer (2) that includes one or more organic polymers, where the organic polymers comprise at least 70 wt.% one or more alkenyl-aromatic polymers, and the foamed polymer layer has opposing first and second major surfaces and a thickness orthogonal to the opposing major surfaces, and a first facer (3) sealingly bonded to the first major surface to form a first outer surface and a second facer (4) sealingly bonded to the second major surface to form a second outer surface. The foamed polymer layer has a foam density of at most 56 kg/m3(3.5 pounds per cubic foot), a thickness of at least 0.6 cm (0.25 inches), an relative strength index (RSI)-value of at least 0.95 K.m2/W per 25.4 mm of thickness (R-value of 5.11 F° .feet2.hours/British thermal unit (BTU)/inch of thickness), and contains at least 0.25 wt.%, based on the weight of the foamed polymer layer, of an infrared radiation attenuating additive. USE - The polymer foam insulation board is used in an inverted roof membrane assembly (claimed). The polymer foam insulation board is used for roofing applications, preferably in inverted roof membrane assemblies (IRMAs), and useful in other thermal insulation and/or protective applications such as insulated concrete forms, insulation for flooring, including insulation for heated floors, insulating concrete tilt-up walls, insulating below-grade masonry structures such as basement walls and/or floors, structural insulated panels, insulation for conventional (i.e. non-inverted) low slope roofs, as thermal insulation for spas and/or hot tubs, including spa hot tub covers, insulation for refrigerated vehicles such as trucks and railcars, insulation for use in geothermal applications, heating, ventilation, and air conditioning (HVAC) insulation, built-in or stand alone refrigerator and/or freezer insulation, insulation for pavement such as walkways, roadways, runways and parking areas, permafrost protection, and insulating transmission tower bases. ADVANTAGE - The polymer foam insulation board has relatively thin foam layers that provide excellent thermal insulation due to the high relative strength index values of the foam. DETAILED DESCRIPTION - Polymer foam insulation board (1) has a foamed polymer layer (2) that includes one or more organic polymers, where the organic polymers comprise at least 70 wt.% one or more alkenyl-aromatic polymers, and the foamed polymer layer has opposing first and second major surfaces and a thickness orthogonal to the opposing major surfaces, and a first facer (3) sealingly bonded to the first major surface to form a first outer surface and a second facer (4) sealingly bonded to the second major surface to form a second outer surface. The foamed polymer layer has a foam density of at most 56 kg/m3(3.5 pounds per cubic foot), a thickness of at least 0.6 cm (0.25 inches), an relative strength index (RSI)-value of at least 0.95 K.m2/W per 25.4 mm of thickness (R-value of 5.11 F° .feet2.hours/British thermal unit (BTU)/inch of thickness), and contains at least 0.25 wt.%, based on the weight of the foamed polymer layer, of an infrared radiation attenuating additive. The first facer has an opacity of at least 65%, an oxygen transfer rate of at most 0.65 cc/m2-day, an oxygen permeation rate of at most 0.9 cc-mil/m2-day, and an Elmendorf tear strength of at least 120 g/25.4 μ m in at least one direction. The second facer has an oxygen transfer rate of at most 0.65 cc/m2-day, an oxygen permeation rate of at most 0.9 cc-mil/m2-day, and an Elmendorf tear strength of at least 120 g/25.4 μ m in at least one direction. The first outer surface exhibits a surface solar reflectance of at least 35% as measured according to . An INDEPENDENT CLAIM is included for an inverted roof membrane assembly (11), comprising (A) decking, (B) a waterproofing membrane mounted directly or indirectly on top of the decking, (C) at least one layer of the polymer foam insulation board directly or indirectly on top of layer (B), and (D) a ballast layer directly or indirectly on top of layer (C). DESCRIPTION OF DRAWING(S) - The drawing shows an isometric view, partially in section, of the inverted roof membrane assembly. 1Polymer foam insulation board 2Foamed polymer layer 3First facer 4Second facer 8Water-proof membrane 9Decking 10Ballast 11Inverted roof membrane assembly 12Optional filter fabric