Inverted Roof Insulation System

Good insulation qualities and low thermal conductivity are required to ensure the low u value of the roof.

Inverted roof insulation system.

Inverted roofs are designed with the waterproofing layer usually a liquid applied membrane beneath the insulation. The membrane is further protected by ballast overtop the insulation. 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 longevity of the entire roof system. Inverted roof systems are also referred to as upside down roof assembly.

Also known as a protected membrane or upside down roof inverted roofs employ insulation which can resist water absorption provide excellent thermal performance be unaffected by freeze and thaw cycles withstand surface traffic and be protected from uv and mechanical damage among others. Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure. It is also protected from damage by traffic on the roof such as people walking the movement of equipment and so on. Used as part of established inverted roof systems it offers a euroclass a1 rating and a high compressive strength.

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 flat roof waterproofing combined with a thermal insulation is essential for a buildings waterproofing and energy saving thermal insulation. The world s thinnest inverted roof insulation once in a while a british product is developed which is an industry game changer. Foamglas invatherm is a non combustible thermal insulation product designed to protect the waterproofing on inverted roofs.

In an irma the system s insulation is installed above the waterproofing membrane instead of below as in a conventional roof assembly. It is therefore essential the insulation layer is rot proof and durable. The mariseal system inverted flat roof waterproofing method offers a simple build up waterproofing that features a protected waterproofing membrane and loose laying insulation boards. Whilst the inverted roof is a robust system the insulation layer does not benefit from the protection of the waterproofing membrane.

Inverted roof membrane assembly irma can be constructed. One of the main benefits of the inverted roof method is that the membrane is protected by the insulation from the expansion and contraction caused by weather fluctuations such as frost and solar radiation. An inverted roof is quite simply where the waterproofing layer is installed over the structural deck rather than over the insulation.