High R Value Roof Insulation
You can achieve better thermal performance in your attic by adding an additional layer of insulation.
High r value roof insulation. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. See the department of energy s doe ranges for recommended levels of insulation below. 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. 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 table below shows what levels of insulation are cost effective for different climates and locations in the home. Foamular high r cw plus insulation combines outstanding moisture resistance with excellent thermal performance. Achieving greater r values in exterior walls in exterior walls add insulating sheathing to achieve a greater r value in your wall system. R panel meets the international building code requirements for a foamed plastic roof insulation.
The higher the r value the better the thermal performance of the insulation. The higher the r value the better the thermal performance of the insulation. Two layers of insulation are installed and held up with metal bands to achieve a high r value. The main advantage of high r cw plus insulation over other xps boards is its higher r value per inch.
Steel bands are installed on the underside and perpendicular to the roof purlins. A high r value system is commonly referred to as a double layer system. 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.
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.