Irma Roof System

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 roof 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. 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. These systems are typically applied in conditions where there is extensive roof traffic or to protect from excessive weather conditions such as. Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards.

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. 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. An irma system is the most common type of roof used on modern high rises today. Irma can be referred to as an insulated roof membrane assembly.

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. Some references may use the term protected membrane roof or pmr system. The insulation may be exposed to water so it should have minimal water absorption characteristics. More generically others may categorize an irma or pmr system as built up roof system or bur.

Extruded polystyrene xps is the most suitable type. In a protected membrane roof also known as an inverted roof membrane assembly irma the insulation is installed on top of the membrane. 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. Irma waterproofing solutions for inverted roofs 2 ply system base sheet over concrete system type.

Inverted roof systems are also referred to as upside down roof assembly. So you have roof deck insulation membrane on top. Inverted roof membrane assembly.