Inverted roofs have their waterproofing layer beneath the insulation instead of above it as in other forms of roofing.
What is an inverted roof.
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.
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.
For inverted roofs drainage should be provided at both the water control layer and waterproofing levels.
An inverted roof is quite simply where the waterproofing layer is installed over the structural deck rather than over the insulation.
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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.
The system is also referred to as a protected membrane or upside down.
Inverted roofs typically last longer than traditional ones.
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.
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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.
What is an inverted roof.
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.
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.
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.
Inverted roof membrance assembly irma systems are used in applications where the membrane requires protection from site specific hazards.
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.
Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure.
