Frequently Asked Questions

How much ventilation do I need for my roof?

For duo pitch roofs over 15º and below 35º an eaves ventilation of 10,000mm/m² is required when the insulation is placed at ceiling level and 25,000mm/m² when the insulation is inclined to the rafters. For roof pitches over 35º or where the span across the gable end is greater than 10m, 5,000mm/m² high level ventilation is required.

For mono pitch roofs over 15º the eaves requirements are the same as for duo pitch roofs but high level ventilation is required at all pitches.

For all roof types below 15º the eaves ventilation requirement is 25,000mm/m².