Upside Down Roof System

Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast.

Upside down roof system.

Illustrations courtesy of american hydrotech inc. In an inverted membrane system the coventional membrane arrangement is invereted or turned upside down. Inverted membrane roof systems. Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards.

The so called upside down roof is simply a rearrangement of the normal elements of a roofing system to try and overcome some of the disadvantages of the conventional arrangement. These systems are typically applied in conditions where there is extensive roof traffic or to protect from excessive weather conditions such as multiple hail events. The system is also referred to as a protected membrane or upside down roof. Benefits of inverted roofs the great benefit of inverted roofs is that the insulation protects the membrane from extremes of weather such as frost uv exposure and the expansion and contraction that comes about from summer winter temperature cycles which can be as much as 80 c on some roofs.

In an inverted membrane system the conventional membrane arrangement is inverted or turned upside down.