Inverted Roof Membrane Assembly

Inverted roof systems are also referred to as upside down roof assembly.

Inverted roof membrane assembly.

Some references may use the term protected membrane roof or pmr system. Inverted roof membrane 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. 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. But the key word here is it s inverted. Best of the dow chemical co. 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.

In an inverted membrane system the coventional membrane arrangement is invereted or turned upside down. Russell right well prma the acronym i think these have been around probably 25 years or so is protected roofing membrane assembly. Inverted roofs typically last longer than traditional ones. 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.

More generically others may categorize an irma or pmr system as built up roof system or bur. In an irma the system s insulation is installed above the waterproofing membrane instead of below as in a conventional roof 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. 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.

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. Much of the initial research on these systems was conducted by the national research council of canada. These systems are typically applied in conditions where there is extensive roof traffic or to protect from excessive weather conditions such as. Bre investigated a large building with an inverted roof that was suffering from persistent leaks with water dripping from the underside of the roof and on to suspended ceiling tiles.

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. Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards. An irma system is the most common type of roof used on modern high rises today.