What Is An Inverted Roof

What is an inverted roof.

What is an inverted roof.

Inverted flat roofs what is an inverted roof. The inverted roof framing leaves attic space for insulation and ducting permits an inexpensive reflective flat roof and puts volume in the living space where occupants can enjoy it. 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. If water is allowed to pond the roof can be exposed to issues such as greater loads than it was designed to accommodate accumulation of unsightly silt and algae and freeze thaw cycles that place stress on roof coverings.

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. The system is also referred to as a protected membrane or upside down. 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.

An inverted roof is quite simply where the waterproofing layer is installed over the structural deck rather than over the insulation. Inverted roofs typically last longer than traditional ones. Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure. In an inverted roof construction the sika trocal membrane is installed directly to the structural decking usually concrete and the innobond thermal insulation is installed on top of the membrane.

In this type of construction the principal thermal insulation material is applied on top of the weatherproof covering so that the complete roof construction including roof covering is kept at warm temperatures during the winter months and at moderate temperatures during the summer months. For inverted roofs drainage should be provided at both the water control layer and waterproofing levels. Inverted roofs have their waterproofing layer beneath the insulation instead of above it as in other forms of roofing. Tribal leaders issued a challenge.

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. These systems are typically applied in conditions where there is extensive roof traffic or to protect from excessive weather conditions such as multiple hail events.