unventilated flat roofs

Purpose of the work

Wooden flat roofs are being increasingly constructed without the tried and tested sub- ventilation layer of the sealing sheet. However, some regulations refer to the high risk of damage to such structures if the sealing on top of the insulation is largely vapor proof. This research was to analyze whether more recent recommendations, as for example installing a variable vapor retarder, lead to a significant reduction in the risk of damage.

Method of approach