Inverted roof

The thermal insulation of flat roofs is a particularly important issue both in winter chills and summer heat.

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General information

The performance and longevity of flat roofs depends upon many factors, including the position of the insulation within the construction. Due to its numerous advantages for flat roofing one of the best solution is the inverted roof construction.

  • protected waterproofing-membrane,
  • the roofing membrane is installed on the roofdeck (concrete deck),
  • simple build-up without additional vapour barrier,
  • the installation of the layers above the membrane is independent from weather,
  • easy and fast installation,
  • simple exploration and leak repair

The closed cell structure design of RAVATHERM™ XPS thermal insulation is perfect for inverted flat roofs.

  • inverted roof with gravel
  • green roof
  • terrace roof
  • parking roof
  • duo roof

Layer Structure

Green Roof - Inverted Roof

Inverted roof

Vehicle-accessible roof - Inverted Roof

Inverted roof

More information

FLAT ROOFS

The advantages of the inverted roof reveal themselves when compared to any other flat roof solution. Because of the danger of condensation, the complex structural design, and the problematic breathability, the double shell cold roof, as a possible structural design solution for flat roofs, is not commonly used. Even though it provides a perfect solution, the straight layer order type of the single shell warm roof has a shorter life expectancy due to the water insulation’s exposure to weather and its implementation without mechanical protection in general, and in the case of failure it is also harder to find and repair the damage.

INVERTED ROOF ADVANTEGES

The inverted flat roof answers all physical, implementation, and operational/usage problems by placing the thermal insulation above the water insulation. The temperature of the thermally insulated waterproofing membrane is roughly the same during the whole year, and in addition to the appropriate mechanical protection, RAVATHERM™ XPS also provides protection against UV radiation. The upside down roof structure is the safest solution for waterproofing and for the operational spaces located under the roof.

The insulation protects the waterproof covering from:

  • wide temperature variations +80 to -20°C
  • degradation from weathering
  • mechanical damage during construction, use and maintenance.

The waterproof layer acts as a total vapour control layer and, being on the warm side of the insulation, is maintained above dew point temperature so the risk of condensation is eliminated.

The inverted roof concept has other benefits. The insulation can be:

  • installed in any weather
  • added to, without stripping the waterproof layer
  • easily lifted and replaced/re-used if the building is altered.

THE LONG LASTING FLAT ROOF

The inverted roof insulation system has been proven successful for more than four decades in Europe. The longterm behavior of the system has been examined by independent institutes and building experts several times.
Their assessments can be summarized as follow:

The life expectancy of the membrane is higher, the risk of failure is reduced, due to the effective and permanent protection for the membrane.
Significant reduction of thermal performance at correct installation and applying diffusion-open coverings are not to be expected.

INSTALLATION OF THERMAL INSULATION IN INVERTED ROOFS

In order to design an appropriate inverted roof and use it in the long-term, respect the following advice:

  • The slope and design of the screed under the waterproofing membrane should comply with the professional guidelines. The use of waterproofing, e.g. bituminous plate, glued on the entire surface is recommended. In the case of utilised roofs, the use of PVC waterproofing membranes is to be avoided.
  • The thermal insulation boards should be laid loosely, in an offset bond on the roof. The boards can be cut to size using a hot-wire cutter or thick-toothed saw on site.
  • The filtering, separating and surface-stabilizing layer, that is, the geotextile or water-guide film should be a non-absorbent material to avoid the possible creation of a water film over the thermal insulation boards.

The thickness of the ballast layer should be dimensioned for wind-suction, but it should be a 50-mm thick washed 16/32 gravel layer. Adjacent to attic walls and roof superstructures, concrete tiles may be used as additional load based on the calculation.

ÉNGY, TERC code

  • Thermal insulation of flat roofs I.
    PRODUCT NAMETHICKNESSÉNGY CODE (MV)TERC CODE
    RAVATHERM XPS 300SL3048-007-055152548-007-11.21.1-0110112
    RAVATHERM XPS 300SL4048-007-055153048-007-11.21.1-0110113
    RAVATHERM XPS 300SL5048-007-055154248-007-11.21.1-0110114
    RAVATHERM XPS 300SL6048-007-055155448-007-11.21.1-0110115
    RAVATHERM XPS 300SL8048-007-055156648-007-11.21.1-0110116
    RAVATHERM XPS 300SL10048-007-055157148-007-11.21.1-0110117
    RAVATHERM XPS 300SL12048-007-055158348-007-21.11.1-0110118
    RAVATHERM XPS 300SL14048-007-055159548-007-21.11.1-0110119
    RAVATHERM XPS 300SL15048-007-242632648-007-11.21.1-0110120
    RAVATHERM XPS 300SL16048-007-242633148-007-21.11.1-0110121
    RAVATHERM XPS 300SL18048-007-242634348-007-21.11.1-0110122
    RAVATHERM XPS 300SL20048-007-242635548-007-21.11.1-0110123
    RAVATHERM XPS 300SL22048-007-438477548-007-21.11.1-0110103
    RAVATHERM XPS 300SL24048-007-438478048-007-21.11.1-0110104
    RAVATHERM XPS 300SL26048-007-438479248-007-21.11.1-0110106
    RAVATHERM XPS 300SL28048-007-438480248-007-21.11.1-0110107
  • Thermal insulation of flat roofs II.
    PRODUCT NAMETHICKNESSÉNGY CODE (MV)TERC CODE
    RAVATHERM XPS 300SL3048-007-438490648-007-11.22.1-0110112
    RAVATHERM XPS 300SL4048-007-438491148-007-11.22.1-0110113
    RAVATHERM XPS 300SL5048-007-438492348-007-11.22.1-0110114
    RAVATHERM XPS 300SL6048-007-438493548-007-11.22.1-0110115
    RAVATHERM XPS 300SL8048-007-438494048-007-11.22.1-0110116
    RAVATHERM XPS 300SL10048-007-438495248-007-11.22.1-0110117
    RAVATHERM XPS 300SL12048-007-438496448-007-11.22.1-0110118
    RAVATHERM XPS 300SL14048-007-438497648-007-11.22.1-0110119
    RAVATHERM XPS 300SL15048-007-438498148-007-11.22.1-0110120
    RAVATHERM XPS 300SL16048-007-438499348-007-11.22.1-0110121
    RAVATHERM XPS 300SL18048-007-438500548-007-11.22.1-0110122
    RAVATHERM XPS 300SL20048-007-438501048-007-11.22.1-0110123
    RAVATHERM XPS 300SL22048-007-438486048-007-11.22.1-0110103
    RAVATHERM XPS 300SL24048-007-438487248-007-11.22.1-0110104
    RAVATHERM XPS 300SL26048-007-438488448-007-11.22.1-0110106
    RAVATHERM XPS 300SL28048-007-438489648-007-11.22.1-0110107
  • Thermal insulation of flat roofs III.
    PRODUCT NAMETHICKNESSÉNGY CODE (MV)TERC CODE
    RAVATHERM XPS 500SL4048-007-0551675 48-007-11.21.1-0110183 
    RAVATHERM XPS 500SL5048-007-0551680 48-007-11.21.1-0110184 
    RAVATHERM XPS 500SL6048-007-0551692 48-007-11.21.1-0110185 
    RAVATHERM XPS 500SL8048-007-0551702 48-007-11.21.1-0110186 
    RAVATHERM XPS 500SL10048-007-0551714 48-007-11.21.1-0110187 
    RAVATHERM XPS 500SL12048-007-2426384 48-007-11.21.1-0110188 
    RAVATHERM XPS 500SL14048-007-2426396 48-007-11.21.1-0110189 
    RAVATHERM XPS 500SL15048-007-4384831 48-007-11.21.1-0110202 
    RAVATHERM XPS 500SL16048-007-2426406 48-007-11.21.1-0110190 
    RAVATHERM XPS 500SL18048-007-4384843 48-007-11.21.1-0110205 
    RAVATHERM XPS 500SL20048-007-4384855 48-007-11.21.1-0110206 
  • Thermal insulation of flat roofs IV.
    PRODUCT NAMETHICKNESSÉNGY CODE (MV)TERC CODE
    RAVATHERM XPS 500SL4048-007-055253048-007-11.22.1-0110184
    RAVATHERM XPS 500SL5048-007-055254248-007-11.22.1-0110185
    RAVATHERM XPS 500SL6048-007-055255448-007-11.22.1-0110186
    RAVATHERM XPS 500SL8048-007-055256648-007-11.22.1-0110187
    RAVATHERM XPS 500SL10048-007-242717148-007-11.22.1-0110188
    RAVATHERM XPS 500SL12048-007-242718348-007-11.22.1-0110189
    RAVATHERM XPS 500SL14048-007-438504648-007-11.22.1-0110202
    RAVATHERM XPS 500SL15048-007-242719548-007-11.22.1-0110190
    RAVATHERM XPS 500SL16048-007-438505148-007-11.22.1-0110205
    RAVATHERM XPS 500SL18048-007-438506348-007-11.22.1-0110206
    RAVATHERM XPS 500SL20048-007-055252548-007-11.22.1-0110183

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