According to Clopay, upgrading from two-inch polystyrene to its ... homes should have attic insulation between R-22 and R-49 ...

Made from fiberglass, cellulose or recycled materials, loose-fill or blown ... rigid board insulation is made from polyisocyanurate or polyiso, extruded polystyrene (XPS) or expanded polystyrene ...

Existing rigid board insulation (such as extruded polystyrene) is made of finite ... lowering the aged R-value." In addition, loose fill and batt insulation can settle, especially in a movable ...

The NYS Department of Environmental Conservation (DEC) said the 'Expanded Polystyrene Foam Container and Loose Fill Packaging Ban' is also intended to promote recycling and reduce litter.