Valley: the internal angle formed by the intersection of two sloping roof planes.

 

Vapor Retarder: material installed to impede or restrict the passage of water vapor through a roof assembly.

 

Vent: an opening designed to convey air, heat, water vapor or other gas from inside a building or a building component to the atmosphere.

 

Ventilator: an accessory that is designed to allow for the passage of air.

 

Vulcanization: any of various processes by which natural or synthetic rubber or other polymeric materials may be cured or otherwise treated (i.e., exposed to chemicals, heat, or pressure) to render them non-thermoplastic, and which improve their elastic and physical properties.

 

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