If you have a colourbond roof and sarking, do the exhaust fans from your bathrooms and range hood have to vent outside? Or at the very least do you need to have some form of roof ventilation ie whirlybird?
I've taken a look at the building codes and from what I can see the roof does need to be vented, but just wanted to get confirmation as the plans my builder supplied do not show or mention any form of roof ventilation.