Rigid Foam Insulation R Value

Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.

Rigid foam insulation r value.

Blue board can be used both on exterior and interior walls to give you a continuous insulation barrier that can increase effective r value of the wall by up to 20. When it comes to insulation performance the difference is in the details. Polyiso has an r value of r 5 7 to r 6 it s lower in cold weather. It also is the least expensive.

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 your attic to reach r 30 if you live in zones 2 or 3. These foam types have similar but somewhat different applications. This material costs less than other rigid foam boards but still offers an r value of. Note from this chart that the ideal r value differs for each part of your home.

With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. Xps is rated at r 5 per inch. 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. Dow styrofoam insulation blue board dow styrofoam insulation blue board is a nonstructural rigid board insulation manufactured of extruded polystyrene foam xps.

Expanded polystyrene eps or beadboard serves as the best insulating rigid foam for homeowners on a budget. Foamular extruded polystyrene xps rigid foamular extruded polystyrene xps rigid foam insulation offers a comprehensive line of products choose the strength you need from 15 to 60 psi and exceptional moisture resistance. Rigid foam r values range from r 1 for 1 4 inch thick sheathing panels to r 15 for 3 inch thick panels. 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.

Eps has the lowest average r value of the three most common types of rigid foam insulation around r 4 per inch. Fiberglass insulation packs in more r value per cubic inch than rigid foam insulation does. Eps is suitable for ground contact and can be treated to resist insects. The r value of eps ranges from about r 3 6 to r 4 2 per inch.

This product typically has an r value of 3 6 to 4 0 per inch of thickness.