Inverted Roofing Details

An inverted roof also referred to as a protected membrane or upside down roof is form of flat roof in which the waterproofing layer is beneath the thermal insulation rather than above it.

Inverted roofing details.

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. Inverted roof systems in this type of construction the principal thermal insulation material is applied on top of the weatherproof covering so that the complete roof construction including roof covering is kept at warm temperatures during the winter months and at moderate temperatures during the summer months. Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast. Simply defined as a type of roof construction where the waterproofing layer lies beneath the insulation instead of above it as in other forms of roofing inverted roofs ensure that the complete roof construction including roof covering is kept at warm temperatures during winter months and at moderate temperates during the summer months.

Inverted roofs are designed with the waterproofing layer usually a liquid applied membrane beneath the insulation. An inverted roof is quite simply where the waterproofing layer is installed over the structural deck rather than over the insulation. This makes it the only material suitable and approved for inverted roof applications.