Inverted Roof Membrane Assembly Detail

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 roof membrane assembly detail.

Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards. Inverted roof membrane assembly irma offer superior protection of the roof membrane from foot traffic and mechanical damage. Some references may use the term protected membrane roof or pmr system. Inverted roof membrane assembly.

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. Irma can be referred to as an insulated roof membrane assembly. Liveroof maxx green roof modules over inverted roof pmr assembly detail author. Liveroof green roof module detail architectural drawings cut sheet system properties intensive conventional roof tpo epdm membrane slip sheet created date.

This assembly has produced a variety of terms such as an upside down roof or inverted roof system and in 1968 a patent was issued on the insulated roof membrane assembly irma developed by j s. Explore each roof assembly in greater detail below or dig into the downloadable materials to learn more. Protects roof layers from uv and mechanical damage inverted roofs are typically assembeled as vegetative ballasted or plaza roofs. In an inverted membrane system the coventional membrane arrangement is invereted or turned upside down.

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. An irma system is the most common type of roof used on modern high rises today. Best of the dow chemical co. Inverted roofs are designed with the waterproofing layer usually a liquid applied membrane beneath the insulation.

The membrane is further protected by ballast overtop the insulation. More generically others may categorize an irma or pmr system as built up roof system or bur. Inverted roof membrane assembly irma systems are used in applications where the membrane requires protection from site specific hazards. Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast.

In an irma the system s insulation is installed above the waterproofing membrane instead of below as in a conventional roof assembly.