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1/2" 4x8 Dow Blue Board


McCoy's Part #: 020812
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Using Dow's Styrofoam* residential sheathing extruded polystyrene insulation board on your exterior walls will boost the performance of the entire wall system. This investment will pay for itself in just a few years and will continue to provide value for years to come.
  • Styrofoam* polystyrene insulation
  • Superior R-value 3
  • Plastic film on both sides
  • Moisture resistant
  • Moderates temperature in walls
  • Reduces moisture condensation
  • Provides a level,even surface for exterior sheathing
  • Score & snap
  • SKU# 020812