Warm roof, cold roof and inverted roof

Warm roof, cold roof and inverted roof

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Warm roof, cold roof and inverted roof, what are the differences and the characteristics to consider of these three covers? Factors to consider when renovating.

In case ofroof renovationit is important to keep in mind the difference betweenwarm roof and cold roof. Among the flat roofs, thewarm roofit is certainly the most widespread, however there is a third type of roof to consider, let's talk about the inverted roof.

Warm roof, cold roof and inverted roof, what are the differences and the characteristics to consider of these three covers? Let's see immediately what we are talking about.

Inverted roof

Theinverted roofit is undoubtedly regarded as one of the best covers from a point of viewwaterproofing and insulation,it is certainly more insulating and waterproofing than the warm roof but not the cold roof (also calledventilated roof). A roof defines itselfreversewhen the position of the sheath is inverted with respect to that of the insulation. Despite its good insulation and waterproofing characteristics, theinverted roofit is not very widespread because we users are used to considering the waterproof layer as the last of the roof of a building.

Difference between warm roof and inverted roof:
in the warm roof the insulation is positioned first and then the sheath. In the inverted roof, the sheath is placed under the insulation so as to be less exposed to thermal variations.

Warm roof

In inverted roof, if the sheath is protected, it is the insulating layer that risks the so-called "washout effect" and that is why it should be protected with an additional layer, usually gravel is used but the washout effect is only mitigated.

Thewarm roofsees the use, as the outermost layer, of the classic bituminous or synthetic sheaths. Inwarm roof, the insulating layer is placed under the sheath and the insulation remains protected without suffering the washout effect.

On the other hand, it should be remembered that bituminous membranes are very sensitive to thermal excursions. The sun beats on the roof and in the evening there is high humidity, these factors tend to create cracks in the bituminous layer putting the house at risk of infiltration. As well as theinverted roofmust contain a layer of gravel, the hot roof must be covered with acrylic resins (on the market they are red, green, white or black), these resins protect the sheath from thermal excursions and consequently preserve the underlying layer insulating.

The bare sheath cannot be walked on, while with the addition of acrylic resin it will be possible to walk on warm roof. The acrylic resin layer must be refreshed annually, otherwise you risk damaging the sheath by leaving it too exposed to sudden changes in temperature.

Cold roof or ventilated roof

This is the most complex cover but also the most effective in terms of thermal insulation and prevention of infiltrations, humidity problems, mold ... cold roofconsists of an insulating and waterproofed roof that overlooks an "air chamber", a layer that allows the ventilation offering better thermal insulation, that's why to say cold roof or ventilated roofit means the same thing.

In a cold roof there is an authentic ventilated exchange chamber, completely eliminating the problem related to condensation inside the walls of the house and the subsequent formation of water vapor is avoided by ventilation with steam extrusion.

Thecold roofit can be realized both in the construction phase and in theroof renovation, applying panels under the pitched roof that allow the formation of the air gap. During the works, it is necessary that the interspace maintains the same thickness along the entire water table in order to avoid air accumulation phenomena with different temperatures and bottlenecks that slow down or prevent ventilation.

For more information about the advantages and disadvantages, stratigraphyand degree of insulation provided by a cold roof, we invite you to read the dedicated page:ventilated roof, how it works.

Video: Inverted roof insulation by URSA (August 2022).