Inverted Roof Membrane Assembly

An inverted roof system is sometimes referred to as the protected membrane roof and utilizes a special extruded insulation which is designed to withstand.

Inverted roof membrane assembly.

An inverted roof also known sometimes as a protected membrane or pmr roof uses the same materials as a conventional roof but places insulation on the top of the membrane. Inverted roof membrane assembly irma systems are used in applications where the membrane requires protection from site specific hazards. 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.

Inverted roof systems are also referred to as upside down roof assembly. But the key word here is it s inverted. Inverted roof membrane assembly. Best of the dow chemical co.

Much of the initial research on these systems was conducted by the national research council of canada. Some references may use the term protected membrane roof or pmr system. Invented by dow in the late 1960 s an inverted roof system uses dupont styrofoam brand xps insulation to protect the membrane helping improve the performance and. 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.

Irma can be referred to as an insulated roof membrane assembly. An irma system is the most common type of roof used on modern high rises today. Inverted roofs typically last longer than traditional ones. An inverted roof assembly is where the insulation layer is above the waterproofing layer as opposed to a conventional roof system where the insulation is sealed under the roof membrane.

Inverted roofs have significantly lower maintenance costs than conventional low slope roofs thanks in large part to the insulation in the inverted assembly protecting the roof membrane from mechanical damage during and after construction as well as temperature extremes that cause stress. In an irma the system s insulation is installed above the waterproofing membrane instead of below as in a conventional roof assembly. Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards. More generically others may categorize an irma or pmr system as built up roof system or bur.

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 membrane assembly irma offer superior protection of the roof membrane from foot traffic and mechanical damage. When the insulation was removed from the worst affected area a large number of water filled blisters were found in the waterproof membrane figure 1.