U V
Valley Board
Boarding fixed to the top of a roof valley rafter to form the support for a valley gutter.
Valley Gutter
Sheet metal gutter sloping along the valley surface of a roof.
Variation
An addition or omission to contracted works.
Ventilation
The supplying of outside air to an enclosed area.
Vitrified Clay Tile
A non-porous tile used in areas where low water absorption is required.