What Is An Inverted Roof Assembly

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What is an inverted roof assembly.

Best of the dow chemical co. In an irma the system s insulation is installed above the waterproofing membrane instead of below. 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. Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast.

Inverted roof systems are also referred to as upside down roof assembly. Inverted roofs typically last longer than traditional ones. Benefits of inverted roofs. Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards.

More generically others may categorize an irma or pmr system as built up roof system or bur. Irma can be referred to as an insulated roof membrane assembly. Some references may use the term protected membrane roof or pmr system. Ballast roofs are your typical inverted roof but using gravel to hold the roofing components into place.

Inverted roofs are designed with the waterproofing layer usually a liquid applied membrane beneath the insulation. 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. In an inverted membrane system the coventional membrane arrangement is invereted or turned upside down. Extruded polystyrene xps is the most suitable type.

Inverted roof membrane assembly irma inverted roof membrane assembly irma offer superior protection of the roof membrane from foot traffic and mechanical damage. Explore each roof assembly in greater detail below or dig into the downloadable materials to learn more. An irma system is the most common type of roof used on modern high rises today. 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.

Inverted roofs are typically assembeled as vegetative ballasted or plaza roofs.