Styrofoam Insulation R Value 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 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.

Styrofoam insulation r value per inch.

Extruded polystyrene xps easily recognized by its blue green or pink color 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 loose packed fibers powder. 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. Some products have reinforced facing to make them sturdier.

It also is the least expensive. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. It provides r values that range from 3 6 to 4 2 per inch.

Asbestos lagging and paste will have a lower value. It provides about r 5 per inch. Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used than batts. This foam board insulation is available with straight or tongue and groove edges to help limit air movement.

All these have r values ranging from r 3 2 to r 3 8 per inch. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Asbestos corrugated paper pipe insulation. Eps is suitable for ground contact and can be treated to resist.

Expanded polystyrene eps eps is the insulation used most widely in insulated concrete forms and structural insulated panels sips. The r value of. 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. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Eps has the lowest average r value of the three most common types of rigid foam insulation around r 4 per inch. Choose this option for areas that need a good amount of strength and water resistance. For a 1 in thick 4 8 panel.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. It is denser than eps and provides more r value with a rating of 5 per inch of thickness. Closed cell spray foam r values. Asbestos cement shingle siding.

Closed cell spray foam insulation. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Asbestos cement board r value. Also called styrofoam insulation this is the least expensive material.