Roof Space Ventilation

Roof space ventilation can reduce the cooling load of your dwelling by allowing hot air and excess moisture in the roof space to escape.

BASIX recognises two types of roof space ventilation which must be installed in accordance with the following requirements:

Gable-end vents

• Gable-ends are the triangular part of a wall adjacent to the roofspace in a pitched roof.
• This option will require a minimum of two vents, one at each end of the roofspace, with an aggregate fixed open area of not less than 1% of the ceiling area.

Wind-driven ventilators (whirligigs)

• This option will require one ventilator for every 100 m² of ceiling (or part thereof), and eave or gable-end vents with an aggregate fixed open area of not less than 0.2% of the ceiling area.