High R Value 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.

High r value roof insulation.

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. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Two layers of insulation are installed and held up with metal bands to achieve a high r value.

Here are some currently available high r building insulation products as well as some specialty very high r insulation materials. 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. See the department of energy s doe ranges for recommended levels of insulation below. A high r value system is commonly referred to as a double layer system.

You can achieve better thermal performance in your attic by adding an additional layer of insulation. High r cw plus insulation is a rigid closed cell xps board. 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. 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.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. Steel bands are installed on the underside and perpendicular to the roof purlins. The higher the r value the better the thermal performance of the insulation. The main advantage of high r cw plus insulation over other xps boards is its higher r value per inch.

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.