Fireproof gypsum board: characteristics, fire resistance class

The use of drywall in repair and construction work has long been the norm. This material can be used in different situations, even when there is a need to provide walls with a fire-resistance quality. The usual drywall for such purposes is not suitable, but on sale it is possible to find a heat-resistant variety of this material.

It consists of a drywall layer, which is treated with special substances. Due to its properties, the sheet is able to withstand the effects of open fire. In this case, the spread of smoke and combustion is prevented. To distinguish fireproof gypsum cardboard from other varieties of this material is possible by marking and color. Cloths are painted in pink.

Specifications

Refractory drywall has a density of 850 kg / m ³ , this figure is higher than that of a standard drywall. In the case of the latter, the density is 800 kg / m ³ . It is important to pay attention to the thermal conductivity, it is equal to 0.22 W / Mk, which is by 0.13 higher than the conventional sheet.

The fire resistance class of the material is determined by the fire resistance limit. This parameter is 45 minutes. If the wall variety is considered in more detail, the fire resistance limit is 20 minutes. This time will go to complete destruction of the leaf when exposed to a flame.

Cardboard in the process of production is impregnated with special substances, the gypsum contains reinforcing additives, in the core there is crystallized water, which takes a fifth of the mass of the material. In case of fire, water prevents the spread of fire. If you decide to purchase a fireproof drywall, you need to make sure that it is one. To do this, the seller should require a fire safety certificate.

Class of flammability

Having familiarized yourself with the documentation, you will be able to learn that fireproof plasterboard corresponds to the G1 flammability class. As for toxicity, this parameter is designated as T1. According to flammability, the fireproof gypsum board corresponds to class B3. The smoke formation is also important, the material described in this respect corresponds to the class D1.

Before you buy a fireproof drywall, you should pay attention to the fact that the sheet must correspond to the standard thickness, which is equal to the limit of 12.5 to 15 mm. As for the other dimensions, they remain the same for fire-resistant drywall as for a regular sheet.

Reaction to fire

Refractory drywall under the influence of high temperatures on it will behave normally, problems arise only when exposed to open fire. The longer the material will resist the flame, the better. But the shell of cardboard will still burn, while the core of gypsum is cracked. This is much slower compared to wall gypsum plasterboard.

The fire resistance limit can be 50 minutes. For different manufacturers this parameter differs, which affects the price of the material. After the expiration of this period, the leaf is destroyed, but everything will depend on the intensity of the fire. For the reason that the material corresponds to the above-mentioned combustibility class, it can be classified as non-combustible materials that do not spread fire and do not support burning. For 45 minutes the material will retain its bearing capacity and integrity, eliminating the passage of fire in the opposite direction. This is true for the case where gypsum board was used to build a partition.

Scope of use

Fireproof plasterboard is usually not used for leveling walls in ordinary rooms. It is not used to arrange the ceiling. However, there are situations where fire protection is very to the point. This should include:

• Facing fireplaces;
• Wall cladding in the sauna and sauna;
• Wall finishing in the boiler room, production facilities, boiler rooms;
• Finishing of wooden houses;
• Creation of household air ducts.

Refractory gypsum board is also used for the construction of partitions, in the inner space of which it is supposed to lay power cables.

Description of fireproof gypsum board from the manufacturer "Knauf"

Fireproof gypsum board "Knauf" is popular with modern consumers. With its help, the exterior and interior walls of the building are finished, to which fire safety requirements are made. GKLO found its application in the construction of houses that were built of combustible materials.

The characteristics of fireproof plasterboard allow it to withstand high temperatures for a long time. Cloths are able to undergo the action of a flame for up to 60 minutes, while combustion and smoke will not spread. If you compare with moisture-resistant plasterboard, the material described in this article also consists of reinforced fiberglass, as well as gypsum, which improves the performance. Properties of resistance to combustion are provided by clay, which is able to withstand the effects of high temperatures.

Additional features

Refractory drywall from the manufacturer "Knauf" has many advantages, among them it should be noted:

• The possibility of using in premises of different purposes;
• Excellent moisture resistance;
• Ability to reduce the temperature when exposed to strong fire;
• The presence of a clay layer, which has high thermal insulation features;
• durability.

It is important to note that the Knauf firewall is ready to serve for 5 years longer than the analogues. For any finish coat, a very important characteristic is weight. The material described has a negligible mass, so it can be installed not only on the walls, but also on the ceiling. In the first case, we are talking about a material of a more impressive thickness, as standard this parameter is equal to 12.5 mm.

The edge of this kind of gypsum board is semicircular. On sale, you can find sheets with the following dimensions: 2500x1200x12.5 mm. As for the thickness, it varies from 6.5 to 9.5 mm. As an intermediate value is a parameter equal to 8 mm. Fireproof gypsum board, the characteristics of which are mentioned in the article, has a mass equal to 30 kg. This is true for one sheet. The cloth is able to withstand temperatures up to +600 ° C.

Mounting Features

If you install a firewall partition of plasterboard, you should be aware that the material characteristics affect the progress of the work. For the reason that additional fibers are present in the gypsum, the core of the leaf acquires the ability of increased resistance to fire. That's why screwing screws into such material is much more difficult, as well as cutting it, this greatly slows down the work.

In order to provide a higher stability in case of fire, it is necessary to lay the material in two layers, making the distance between the profiles smaller. If you decided to equip a fireproof ceiling from gypsum board, then it must be remembered that the sheets should not be installed on a wooden crate. This will improve the quality of the fire resistance of the structure. It is better to use metal profiles for this, otherwise the technology is no different from the one where conventional drywall is used.

Conclusion

Fireproof gypsum board, whose price is 350 rubles / sheet, is a finishing material for the arrangement of suspended ceilings and partitions in the premises, which are subject to special requirements for fire safety. This material is used to form fire retardant coatings, as well as structures.

Cloths are highly resistant to the effects of flame. After the completion of the fire resistance phase, the destruction of the material begins. These qualities are provided by the technology of production, which involves the use of gypsum and organic substances, among the latter should be given clay. The material is additionally reinforced by means of filament glass.