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Valley

The sloping intersection of pitched roof slopes.

Vapour Barrier

A barrier used to prevent condensation on the warm side of insulation. Should be used together with good ventilation and a 'Breather Membrane'.

Veneer

A thin decorative finishing layer of wood or other material.

Ventilation

The movement of air to disperse moisture from a building to prevent condensation, rot and other problems.

Verge

The edges of a pitched roof slope.

Vermiculite

An expanded, non-combustible aggregate used for thermal insulation.