Irma Roof System

In an irma the system s insulation is installed above the waterproofing membrane instead of below.

Irma roof system.

In a protected membrane roof also known as an inverted roof membrane assembly irma the insulation is installed on top of the membrane. Inverted roof membrane assembly irma inverted roof membrane assembly irma offer superior protection of the roof membrane from foot traffic and mechanical damage. Irma waterproofing solutions for inverted roofs 2 ply system base sheet over concrete system type. Inverted roof membrane assembly waterproofing options heat weld or cold applied 2 ply 3 ply direct to deck 2 ply 3 ply liquid applied jm sbs base sheet.

Extruded polystyrene xps is the most suitable type. Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards. So you have roof deck insulation membrane on top. These systems are typically applied in conditions where there is extensive roof traffic or to protect from excessive weather conditions such as.

More generically others may categorize an irma or pmr system as built up roof system or bur. As you know most design configurations for roof covering system is you have your roof deck structure you have your insulation layers mechanically fastened or adhered and then the membrane goes on top whether it s a built up membrane or a single ply membrane etc. The insulation may be exposed to water so it should have minimal water absorption characteristics. Sbs mb roofing systems can also be used in a protected membrane roof pmr sometimes referred to as an inverted roof membrane assembly irma configuration.

In an inverted membrane system the coventional membrane arrangement is invereted or turned upside down. Note that roof systems typically include more than one type of material a built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. If a pmr system is specified a slip sheet recommended by the membrane manufacturer should be placed between the membrane and the xps to prevent the insulation boards from bonding to the. An irma system is the most common type of roof used on modern high rises today.

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. Irma can be referred to as an insulated roof membrane assembly.