Flat roofing technology involves the creation of a slight slope so that rain and melt water can drain freely into storm systems.
The ways of forming the slope are as follows:
Since the first method is carried out mainly during the general construction installation of a building, it is not advisable to consider it as a component of roofing work.
The most common way of forming a slope on flat roofs is a claydite-concrete screed. In fact, this is not even expanded clay concrete, but mainly expanded clay with a small amount of cement and water, which are necessary as a minimum binder when forming this layer. The main advantage of this method is its high manufacturability and low cost. Modern technologies offer new and effective solutions. One of such solutions is the use of polystyrene concrete. Although it was developed in our country about 25 years ago, it has now received a rebirth. Polystyrene concrete refers to lightweight concrete as the main filler, which is polystyrene granules. The surface of the granules is processed to ensure their uniform distribution in the thickness of the material. The combination of insulating material (polystyrene) and concrete creates an optimal combination of load-bearing properties, thermal insulation, sound insulation and fire protection.
Possessing almost the same cost as expanded clay concrete, polystyrene concrete surpasses it in such indicators as density, thermal conductivity, and manufacturability.
The main comparative characteristics are shown below:
Density (kg / m3): 850
Coeffits. Thermal conductivity, W / (m * C): 0.38
Water absorption,%: 10
Density (kg / m3): 150-550
Coeffits. Thermal conductivity, W / (m * C): 0.6-0.18
Water absorption,%: 6
Higher manufacturability of polystyrene concrete is expressed in the following:
In the event that the roof area has large dimensions, the reduction in such costs can be significant. The latter method of creating a slope is the most time consuming and costly. It is used in exceptional cases when the use of a concrete screed, for one reason or another, is not possible.
The most suitable material for this is foam glass. With this installation, the thermal insulation layer: