It also is the least expensive.
Rigid foam insulation r value.
Dow styrofoam insulation blue board dow styrofoam insulation blue board is a nonstructural rigid board insulation manufactured of extruded polystyrene foam xps.
This material costs less than other rigid foam boards but still offers an r value of.
Expanded polystyrene foam eps is the cheapest and least used foam board product on the market.
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.
Xps is rated at r 5 per inch.
All products in the acfoam polyiso roof insulation family are closed cell rigid foam insulation board flat or tapered.
This product typically has an r value of 3 6 to 4 0 per inch of thickness.
Polyiso has an r value of r 5 7 to r 6 it s lower in cold weather.
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.
The r value of eps ranges from about r 3 6 to r 4 2 per inch.
Products provide superior insulating properties.
Eps is suitable for ground contact and can be treated to resist insects.
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.
When it comes to insulation performance the difference is in the details.
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.
Expanded polystyrene eps or beadboard serves as the best insulating rigid foam for homeowners on a budget.
For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.
Fiberglass insulation packs in more r value per cubic inch than rigid foam insulation does.
Note from this chart that the ideal r value differs for each part of your home.
Rigid foam r values range from r 1 for 1 4 inch thick sheathing panels to r 15 for 3 inch thick panels.