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.

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. Foamular high r cw plus insulation combines outstanding moisture resistance with excellent thermal performance. The table below shows what levels of insulation are cost effective for different climates and locations in the home. R panel meets the international building code requirements for a foamed plastic roof insulation.

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. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Steel bands are installed on the underside and perpendicular to the roof purlins. Here are some currently available high r building insulation products as well as some specialty very high r insulation materials.

See the department of energy s doe ranges for recommended levels of insulation below. 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. Two layers of insulation are installed and held up with metal bands to achieve a high r value. The material is costly and fragile factors that have limited its use in residential construction.

The higher the r value the better the thermal performance of the insulation. 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. 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 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.

A high r value system is commonly referred to as a double layer system.