Rigid Foam Insulation R Value

All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered.

Rigid foam insulation r value.

Products provide superior insulating properties. With premium polyiso manufacturing atlas is able to produce the highest effective r values with minimal material thickness. Rigid foam r values range from r 1 for 1 4 inch thick sheathing panels to r 15 for 3 inch thick panels. Polyiso has an r value of r 5 7 to r 6 it s lower in cold weather.

Xps is rated at r 5 per inch. It also is the least expensive. Eps has the lowest average r value of the three most common types of rigid foam insulation around r 4 per inch. 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.

Dow styrofoam insulation blue board dow styrofoam insulation blue board is a nonstructural rigid board insulation manufactured of extruded polystyrene foam xps. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. When it comes to insulation performance the difference is in the details.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. 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 is suitable for ground contact and can be treated to resist insects. 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.

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. Fiberglass insulation packs in more r value per cubic inch than rigid foam insulation does. This material costs less than other rigid foam boards but still offers an r value of. Expanded polystyrene eps or beadboard serves as the best insulating rigid foam for homeowners on a budget.

Note from this chart that the ideal r value differs for each part of your home.