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Inverted roof: what it is, what are its advantages when compared with a warm roof and a cold roof. How to make an inverted roof practicable.
Differences between inverted roofs and warm roofs
In traditional, defined plant coverings warm roofs, the sheath and the insulation have a very specific arrangement: the sheath is placed in the outermost layer while the insulation is placed first. Ininverted roofthis arrangement is simply reversed, so we will have the inner sheath and the insulation as the outer layer of the roof.
A inverted roofit offers excellent waterproofing while the degree of thermal insulation strictly depends on the materials used for the outermost layer, the insulating one. It is necessary to carefully design ainverted roofbecause here, the insulating layer is in direct contact with atmospheric agents and therefore runs the risk of wearing down soon going into that phenomenon known as thermal washout.
For more information on the differences between a warm roof and an inverted roof and to also evaluate a cold roof (ventilated roof), I invite you to read the page that compares these three types of roofs:warm roof, cold roof and inverted roof.
Inverted roof, advantages and disadvantages
Betweenadvantagesof theinverted roofwe see greater protection of the sheath. Anyone who has ever lived in a house in which a sheath represented the outermost layer knows very well that this requires annual maintenance: to protect it from thermal shocks, it is necessary to use acrylic resins that prevent fractures. The sheath is very sensitive to temperature changes between day and night, thus, to avoidpatcheswith additional bituminous layers, industry experts recommend restoring the surface acrylic layer. This procedure is very simple and also economical: to pass the acrylic resins you will only need a 3 euro roller and a good quality acrylic product ... generally with 30 euro you can buy 15 liters useful to protect 110 square meters of well-kept sheath. If the sheath is already worn, more liters of product will be needed. In addition, the acrylic sheet pays offpracticablethe roof.
With theinverted roofthe sheath tends to lengthen deterioration times, it is not necessary to carry out the procedure described above and it is not even necessary to insert a vapor barrier.
The outermost layer of theinverted roofit is the insulating one, in the more traditional stratigraphies it is covered with gravel but it is always advisable to protect it as best as possible with an additional waterproof covering compatible with the user's needs. Who intends to make apracticable roofand perhaps furnish the terrace, he will have to choose compatible insulation to accommodate a type of flooring.
It is not possible to sayfirstwhether a warm roof or an inverted roof is better, especially when it comes to thermal insulation. Certainly an inverted roof offers greater protection of the waterproofing layer with less risk of infiltration but the thermal comfort strictly depends on the type of material chosen for the installation of the insulating layer of the inverted roof.
The behavior of the roof and its durability depend on the materials that compose it, therefore, even if ainverted roofin theory it has all the credentials to be a high-efficiency and good-smoothed cover, which strongly affects the materials chosen.
Theinverted roofit is the ideal solution from a hygrometric point of view as it avoids the danger (existing intraditional warm roofs) of condensation in the insulating layer where vapor can be trapped between thevapor barrier the waterproof covering. This advantage is also offered by the better defined cold roofventilated roof, for more information, please read the page "ventilated roof, how it works ". Based on the final coverage the inverted roof could be practicable or not practicable. This also depends on the materials and the user's choices.