Inverted Roof System Definition

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.

Inverted roof system definition.

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. 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. The average life of a roof system in north america is around 16 years and the depreciation period for a commercial roof 39 years. Inverted roof designing buildings wiki share your construction industry knowledge.

Inverted roofs typically last longer than traditional ones. 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. In an irma the system s insulation is installed above the waterproofing membrane instead of below as in a conventional roof assembly. In an inverted membrane system the coventional membrane arrangement is invereted or turned upside down.

However deferring a roof replacement by 10 years can save hundreds of thousands of dollars. These systems are typically applied in conditions where there is extensive roof traffic or to protect from excessive weather conditions such as. The ideal assembly for driveways on inverted roofs create a recreational park or plaza on your building s inverted roof including driveways and parking areas. In this issue the investigations team explains how inverted roofs work outlines their benefits warns of a possible cause of problems and describes an unusual investigation.

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. Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards. The membrane is further protected by ballast overtop the insulation.