Dow Polystyrene Insulation Board R Value

2 vertical compressive strength is measured at 10 percent deformation or yield whichever occurs first.

Dow polystyrene insulation board r value.

Since styrofoam brand extruded polystyrene foam insulations are visco elastic materials adequate. Dow invented a process for extruding polystyrene to achieve a closed cell foam that resists moisture. Shop dow r 10 common. R means resistance to heat flow.

R value determined by astm c518. Dow styrofoam scoreboard insulation board blue board 4 ft by 8 ft sheet 1 5 thick r value 7 5 a nonstructural rigid board insulation manufactured of extruded polystyrene foam xps. Styrofoam extruded polystyrene insulation is rated at an r value of 5 0 per inch at 75 f. 2 in x 4 ft x 8 ft.

Since styrofoam brand extruded polystyrene foam insulations are visco elastic materials adequate design safety factors should be used to prevent long term. 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. Ask your seller for the fact sheet on r value. This product typically has an r value of 3 6 to 4 0 per inch of thickness.

The higher the r value the greater the insulating power. R values are expressed in ft h f btu. How does it work.