Provides the best moisture and air infiltration seal between the rafter vent and wall top plate. Works with Durovent and proVent to provide a moisture impervious vent and block system. 

• Now scored for 16″ and 24″ O.C. 

• Install with rafter vents to maximize attic ventilation performance 

• Secures vent in place thus eliminating blow-out during construction 

• Blocks moisture from exterior and acts as an insulation stop 

• Meets energy code requirements for air infiltration 

• Provides a moisture and air infiltration seal between the rafter vent and top of the wall 

• Prevents wind driven moisture and cold air infiltration between the rafter vent and the top of the wall 

• Reduces energy loss at the attic perimeter 

• Effective for use in new and retrofit applications 

• Constructed of waterproof and durable polyboard 

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Want more information on Windblock?
For Homeowners: 866-240-4933
For Contractors: 800-666-8191

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