Rigid Insulation R Values Per Inch

Let s use the r value of iko s polyiso insulation enerfoil tm as an example. It provides r values that range from 3 6 to 4 2 per inch. 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.

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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.

Rigid insulation r values per inch.

It provides about r 5 per inch. Some products have reinforced facing to make them sturdier. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Asbestos cement shingle siding.

Traditional loose fill insulation such as fiberglass or cellulose has an r value between r 2 0 and 3 5 per inch of thickness. Asbestos lagging and paste will have a lower value. 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. Thermal conductivity k 0 15.

Rigid insulation is usually made up of fibrous materials or plastic foams. 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. 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.

This material offers the highest r values about r 6 to 6 5. Asbestos loose packed fibers powder. Most insulation manufacturers will first list their insulation s r value for a one inch sample then they ll give you a chart demonstrating the other r values you can achieve if you install a thicker version of their product. 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.

Polyiso is not rated for ground contact. As the temperature drops so does the r value. 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. This product typically has an r value of 3 6 to 4 0 per inch of thickness.

For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Some builders working in cold climates give it an r value of 4 5 or 5 per inch. The time of testing. Choose this option for areas that need a good amount of strength and water resistance.

Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. Although the nominal r value of polyiso is the highest of the three major types of rigid foam its cold weather performance is lower. Asbestos cement board r value.

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