Inverted Flat Roof Definition

Inverted roofs are a type of warm flat roof where the insulation is above the waterproofing layer.

Inverted flat roof definition.

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. This module is sponsored by radmat. Benefits of inverted roofs. It is typically limited to applications on dead level or flat roofs with slopes of 1 4 in 12 or less.

The mariseal system inverted flat roof waterproofing method offers a simple build up waterproofing that features a protected waterproofing membrane and loose laying insulation boards. 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. 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. This means that the insulation should be highly resistant to water absorption for example an extruded polystyrene based product which will not be affected by water or repeated freeze thaw cycles. An inverted or protected roof is a type of flat roof construction in which the waterproofing layer is placed below the insulation. It is the only roofing material permitted by the international building code to be applied to slopes below 1 4 in 12.

Closed cell polystyrene foam thermal insulation for utilised flat roofs. A section of an inverted roof system using radmat s quantum vacuum insulated panel. This makes it the only material suitable and approved for inverted roof applications. Inverted roof membrane assembly irma tm.

Irma tm and styrofoam are registered trademarks of the dow chemical company. Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure. The code allows its use on roofs with slopes as low as 1 8 in 12.