Roof Insulation R Value Per Inch

To convert rsi to r value multiply the rsi by 5 67826.

Roof insulation r value per inch.

Estimated r value of asbestos insulation per inch for pipe insulation corrugated paper. Some types of insulation will have different r values for the same thickness due to differences in density and some will even increase in r value per inch as the total thickness increases. Insulation r values vary based on the type thickness and density of the insulation material. Polyiso insulation thickness r value chart.

The r value depends on the type of material its thickness and its density. However labeled r value differs from in service r value for many insulations. As a benchmark one inch of solid wood has an r value of 1. Used in roof wall floor below grade structural geofoam applications used most widely in insulated concrete forms and structural insulated panels highest average r value per dollar about 4 6 r per inch costs the least while meeting or exceeding all required building and energy codes.

Polyisocyanurate insulation is a common commercial and residential roof and wall insulation. All these have r values ranging from r 3 2 to r 3 8 per inch. Understanding r value thursday december 13 2018 what does r value mean. Building science corporation bsc and others have been examining this difference.

Insulation ratings are measured in r values per inch of thickness. A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. An r value tells you how well a type of insulation can keep heat from leaving or entering your home.

Asbestos loose packed fibers powder. Asbestos lagging and paste will have a lower value. Closed cell polyisocyanurate foam core. It has one of the highest r values per inch of thickness among common insulations.

Asbestos cement shingle siding. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Asbestos corrugated paper pipe insulation. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.

Contractors often use it to insulate under slabs ceilings walls and roofs. Provides high r value per inch in built up modified bitumen metal roof and single ply roof systems and utilizes a zero ozone depletion blowing agent that provides high thermal insulation performance. It performs better than other insulation types. Thermal conductivity k 0 15.