possibility of installation on old coating;

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The sheets have a wavy shape which the sheet acquires as a result of cold pressure in the profiling rollers.

The characteristics of metal tiles are an indicator of the popularity of the material:

wide range of color palette;
lightness of the sheet;
low price;
durability;
strength;
ease of installation;
environmental safety.
In addition to the positive indicators, there are chinese overseas europe data worth paying attention to:

poor level of sound insulation (additional sound insulation layer required);
a lot of waste is generated during installation (the volume of purchases for the coating should be increased);
the possibility of condensation forming inside the coating (additional gaps are required between the coating and waterproofing);
susceptible to bending and scratching during installation. As a result, metal corrosion.
The disadvantages of the coating do not make metal tiles an unpopular material. The coating is widely used and is the most popular among roofing coatings.

Construction of a roofing pie
Before covering the roof, it is necessary to properly equip the structure under the covering. All layers that are laid under the covering are called the roofing pie.

The roofing cake includes the following layers:

rafter system - a frame that provides strength to the roof and serves as a base for laying the layers of the pie;
vapor barrier layer - serves to prevent moist vapors from entering the insulation;
insulation - reduces heat loss in the room, serves as sound insulation;
ventilation gap - necessary to prevent accumulation of moisture vapor;
waterproofing layer - serves to prevent moisture from entering the room;
counter-battens and lathing - serve as a base for laying the roofing material;