Rigid Insulation R Value Per Inch

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.

Rigid insulation r value per inch.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. 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. Asbestos lagging and paste will have a lower value. It provides r values that range from 3 6 to 4 2 per inch.

Asbestos loose packed fibers powder. Estimated r value of asbestos insulation per inch for pipe insulation corrugated paper. Thermal conductivity k 0 15. Each type comes with unique advantages.

Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. 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. Eps has the lowest average r value of the three most common types of rigid foam insulation around r 4 per inch. Eps is suitable for ground contact and can be treated to resist insects.

Eps is the insulation used most widely in insulated concrete forms and structural insulated panels sips. Products with a higher r value have a higher cost but have an increased capacity to resist heat flow and therefore provide greater insulation. 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. It also is the least expensive.

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 realtime aged as mandated by astm c578 and a method of accelerated aging sometimes called long term thermal resistance lttr per can ulc s770 03. Asbestos cement shingle siding. Also called styrofoam insulation this is the least expensive material. Asbestos cement board r value.

When choosing rigid foam insulation you have three main options. 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. The r value at 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.

For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Known as polyiso for short polyisocyanurate foam has the highest r value per inch r 6 5 to r 6 8 of any rigid insulation. Asbestos corrugated paper pipe insulation. This type of rigid foam usually comes with a reflective foil facing on both sides so it can also serve as a radiant barrier.