Since styrofoam brand extruded polystyrene foam insulations are visco elastic materials adequate design safety factors should be used to prevent long term.
Dow polystyrene insulation board r value.
Styrofoam extruded polystyrene insulation is rated at an r value of 5 0 per inch at 75 f.
R value determined by astm c518.
Ask your seller for the fact sheet on r value.
How does it work.
Since styrofoam brand extruded polystyrene foam insulations are visco elastic materials adequate.
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.
Dow scoreboard is scored over 16 and 24 making it.
Shop dow r 10 common.
2 vertical compressive strength is measured at 10 percent deformation or yield whichever occurs first.
R means resistance to heat flow.
This product typically has an r value of 3 6 to 4 0 per inch of thickness.
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.
2 vertical compressive strength is measured at 10 percent deformation or at yield whichever occurs first.
R values are expressed in ft h f btu.
The higher the r value the greater the insulating power.