Rigid Insulation R Value Per Inch

For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.

Rigid insulation r value per inch.

It also is the least expensive. It provides r values that range from 3 6 to 4 2 per inch. Asbestos cement board r value. Eps is the insulation used most widely in insulated concrete forms and structural insulated panels sips.

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. 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. Eps is suitable for ground contact and can be treated to resist insects. 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 corrugated paper pipe insulation. The time of testing. Asbestos cement shingle siding. Eps has the lowest average r value of the three most common types of rigid foam insulation around r 4 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. This type of rigid foam usually comes with a reflective foil facing on both sides so it can also serve as a radiant barrier. These r values are a sum meaning this should be the total r value once you add up the entire depth of 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.

Each type comes with unique advantages. Products with a higher r value have a higher cost but have an increased capacity to resist heat flow and therefore provide greater insulation. Thermal conductivity k 0 15. Asbestos lagging and paste will have a lower value.

The r value at 180 day real. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. Asbestos loose packed fibers powder. 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.

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. Also called styrofoam insulation this is the least expensive material. 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.