Some references may use the term protected membrane roof or pmr system.
Inverted roof membrane assembly detail.
Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards.
An inverted roof assembly can lengthen the life of the roof contribute to sustainability and provide long term cost savings.
In an inverted roof insulation is placed on top of the membrane enabling a perfect foundation for a terrace garden or green roof on the top of your building.
An irma system is the most common type of roof used on modern high rises today.
Inverted roof membrane assembly.
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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 roofs typically last longer than traditional ones.
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.
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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.
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.
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.
Liveroof maxx green roof modules over inverted roof pmr assembly detail author.
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.
Inverted roof systems are also referred to as upside down roof assembly.
The membrane is further protected by ballast overtop the insulation.
Irma can be referred to as an insulated roof membrane assembly.
In an irma the system s insulation is installed above the waterproofing membrane instead of below as in a conventional roof assembly.
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In an inverted membrane system the coventional membrane arrangement is invereted or turned upside down.
