High R Value Roof Insulation

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.
High r value roof insulation. Steel bands are installed on the underside and perpendicular to the roof purlins. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Foamular high r cw plus insulation combines outstanding moisture resistance with excellent thermal performance. Two layers of insulation are installed and held up with metal bands to achieve a high r value.
R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. The higher the r value the better the thermal performance of the insulation. See the department of energy s doe ranges for recommended levels of insulation below. Here are some currently available high r building insulation products as well as some specialty very high r insulation materials.
The table below shows what levels of insulation are cost effective for different climates and locations in the home. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Aerogel has an r value of about r 10 per inch is 99 air and insulates up to 37 times higher r value than fiberglass. The material is costly and fragile factors that have limited its use in residential construction.
High r cw plus insulation is a rigid closed cell xps board. R panel meets the international building code requirements for a foamed plastic roof insulation. Achieving greater r values in exterior walls in exterior walls add insulating sheathing to achieve a greater r value in your wall system. A high r value system is commonly referred to as a double layer system.
Develops markets and installs innovative wall ceiling insulation products that meet the performance environmental and budgetary needs of building owners building managers architects and builders.