This customer was going to go for a highbred roof; however, after doing some investigations, he found that this was not the way forwards and decided to go for a cold fat roof. Unfortunately, he hadn't built in the ventilation for the cold roof, and he asked my opinion on how to vent the roof how that the timberwork is in place.
​Luckily there are still options open to him and adding ventilation to the flat roof from inside the building is posable. Bouse this is a shed or outhouse, there shoud not be that much moister in the air; therefore, the ventilation isn't as critical as it would be if this was a domestic building and there was a kitchen or bathroom under the roof.