Rigid Foam Insulation Board R Value
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A popular rigid insulation choice xps features an initial r value of r 5 per inch.
Rigid foam insulation board r value. This product typically has an r value of 3 6 to 4 0 per inch of thickness. Expanded polystyrene foam board 1 inch thick 3 8 4 4. For example after just 5 years an xps board will see its r value fall by 10 and even more going forward. Rigid insulation is usually made up of fibrous materials or plastic foams.
That said the long term r values of this foam board decline over time. It s made of environmentally sound closed cell polyisocyanurate foam bonded to a durable white matte non glare aluminum facer and a reflective reinforced aluminum facer. In severe cold xps panels do see an increase to their r values. Our r value guide to rigid insulation includes the doe s recommended insulation by zone chart r value calculator and base building material r values chart.
Rmax r matte plus 3 1 2 in. It is offered in multiple thicknesses and dimensions in both square edged and tongue and groove joints. R 3 2 polyisocyanurate rigid foam insulation board r matte plus 3 thermasheath 3 is rigid foam r matte plus 3 thermasheath 3 is rigid foam plastic thermal insulation board. Extruded polystyrene foam board 1 inch thick 5.
Insulfoam rigid foam is a high performance built to spec sheathing insulation that provides superior r value and moisture resistance. Polyisocyanurate foam board 1 inch thick.