Believe it or not, there’s quite a science between determining how much ventilation your home needs. There’s actually a formula that applies to your whole house, not just the roof cavity.
Ventilation requirements work on the concept of air changes. An air change is how many times air enters and exits a space per hour. Naturally, the higher the number of air changes, the better ventilation you have. But there’s actually some guidelines on how many air changes you should per hour, and this helps to inform the type of ventilation you install.
The general consensus for roof cavities in Australia is that 10 air changes per hour are required to maintain great ventilation. When purchasing ventilation products, they’ll be rated according to how many air changes they support, so this should guide you to getting the very best ventilation for your home.
If you need further advice, as always we recommend speaking to roofing experts who can determine exactly the right products for you.