R Value Of Rigid Insulation Roof

R value chart for enerfoil tm rigid foam faced insulation.

R value of rigid insulation roof.

For a very good introductory overview article on r value see r values over at the website of. Rigid insulation is usually made up of fibrous materials or plastic foams. R value is used in the united states. A rigid roof insulation board with high thermal efficiency johns manville r panel is compatible with multiple types of membrane systems.

Rigid insulation r value by comparison usually ranges from r 4 0 to 6 5 and may get as high as r 8 7 depending on the insulation material. R value of various materials. R value measures how well certain building insulation materials can resist heat. Thickness inches r value in i p imperial rsi r value in metric 0 5.

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. When determining how much insulation you need don t guesstimate calculate. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Rsi r value système international is the metric equivalent.

Know exactly how much you need with our project calculators. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Conditioned per atsm c1289 test method astm c5181 2. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.

Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness.