Dow Polystyrene Insulation Board R Value

R means resistance to heat flow.
Dow polystyrene insulation board r value. 2 vertical compressive strength is measured at 10 percent deformation or yield whichever occurs first. R values are expressed in ft h f btu. Dow scoreboard is scored over 16 and 24 making it. 2 in x 4 ft x 8 ft.
Dow invented a process for extruding polystyrene to achieve a closed cell foam that resists moisture. The higher the r value the greater the insulating power. Shop dow r 10 common. Ask your seller for the fact sheet on r value.
Styrofoam extruded polystyrene insulation is rated at an r value of 5 0 per inch at 75 f. Since styrofoam brand extruded polystyrene foam insulations are visco elastic materials adequate. How does it work. This product typically has an r value of 3 6 to 4 0 per inch of thickness.
Resistance to the flow of heat is measured in r value the higher the r value the harder it is for heat to get through. 2 vertical compressive strength is measured at 10 percent deformation or at yield whichever occurs first. 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.