The insulation may be exposed to water so it should have minimal water absorption characteristics.
Irma roof assembly.
An irma system is the most common type of roof used on modern high rises today.
Russell right well prma the acronym i think these have been around probably 25 years or so is protected roofing membrane assembly.
Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards.
Where irma and some people remember it by inverted roofing membrane assembly or it really means insulated roof membrane assembly.
Inverted roof membrane assembly irma inverted roof membrane assembly irma offer superior protection of the roof membrane from foot traffic and mechanical damage.
University of massachusetts amherst ma.
In an irma the system s insulation is installed above the waterproofing membrane instead of below.
Protected membrane roof pmr in a protected membrane roof also known as an inverted roof membrane assembly irma the insulation is installed on top of the membrane.
More generically others may categorize an irma or pmr system as built up roof system or bur.
Challenge in 2004 the board of trustees at the university of massachusetts were so concerned to have the job done right the first time that they required a 30 year warranty to waterproof the du bois library s 65 000 square foot green roof plaza.
Extruded polystyrene xps is the most suitable type.
Placed on top of hydrotech s monolithic membrane 6125 it offers protection from the harsh roof environment.
This arrangement of roofing materials roof deck waterproofing membrane moisture resistant insulation is commonly referred to today as the protected membrane roof pmr or insulated roof membrane assembly irma.
But the key word here is it s inverted.
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.
