Get this Owens Corning R-3 Rigid Insulation – FORMULAR NGX – Square Edge delivered onsite. Completely eliminates use of HFC 134a. Manufactured with a blowing agent formulation that delivers a 90% reduction to global warming potential (100-year)1. Excellent energy efficiency in the form of a high R-5 per inch. Extremely low water absorption potential, delivering superior R-value retention in the presence of water. Wide range of compressive strengths – up to 100 psi – to handle heavy loads. Only XPS with a limited lifetime warranty that guarantees a minimum 90% of R-value for the life of the product. ENERGY STAR. Being used for crafts, acrylic or latex based paints can be used with foamular products. Being used in an interior construction application, painting the foam is not recommended as foamular cannot be left exposed and will need to be covered by a 15-minute thermal barrier such as drywall. When using foamular or any low perm insulation, always verify the moisture vapor flow and dew point characteristics of the wall system, please check your local building codes for vapor retarder/barrier information. Scored square edge – comes with 3 factory scores, so that you can take a 4 ft. sheet, break it in 2 and have two, 2 ft. W sheets (middle score) or you can break it into 3 16 in. W pieces by snapping at the left and right score. Square edge – designed to fit flush next to adjoining boards. Scored square edge – comes with 3 factory scores, so that you can take a 4 ft. sheet, break it in 2 and have two, 2 ft.wide sheets (middle score) or you can break it into three 16 in. wide pieces by snapping at the left and right score. Foamular is not rated for STC (sound transmission) and does not have any soundproofing properties.