Rigid Insulation R Values Per Inch

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.

Rigid insulation r values per inch. Asbestos loose packed fibers powder. Polyiso is not rated for ground contact. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. Let s use the r value of iko s polyiso insulation enerfoil tm as an example.

Falls in the middle of the three types of rigid foam insulation in both cost and r value used most in walls or below grade applications recyclable and at about r 5 per inch costs around 42 per sq. Asbestos cement shingle siding. This product typically has an r value of 3 6 to 4 0 per inch of thickness. Choose this option for areas that need a good amount of strength and water resistance.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. The time of testing. Some builders working in cold climates give it an r value of 4 5 or 5 per inch. The r value for foamular xps insulation is provided from testing at two mean temperatures 40ºf and 75ºf and from two aging conditioning techniques 180 day real.

Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness. Estimated r value of asbestos insulation per inch for pipe insulation corrugated paper. For example a wall with 3 fiberglass batting r value of 10 8. Asbestos lagging and paste will have a lower value.

Although the nominal r value of polyiso is the highest of the three major types of rigid foam its cold weather performance is lower. 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. Thermal conductivity k 0 15. It provides about r 5 per inch.

It provides r values that range from 3 6 to 4 2 per inch. Some products have reinforced facing to make them sturdier. Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s. As the temperature drops so does the r value.

Rigid insulation is usually made up of fibrous materials or plastic foams. Because rigid foam plastic insulation products are not all aged in accordance with the same standards it is useful to publish comparison r value data. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.