Knauf gypsum board specifications

Drywall is a modern material for interior decoration, which is today at the peak of its popularity. The combination of great features and affordable prices make gypsum plasterboards (GKL) an indispensable material when leveling walls, erecting interior partitions, the design of door and window slopes, the creation of suspended ceilings, curved surfaces and structures of the most various forms. Consider the technical characteristics that a quality sheet of drywall must have in accordance with the requirements of GOST, and find out what types of material should be preferred for use in certain conditions.

Gypsum plasterboard is a rectangular product, consisting of pressed gypsum brand G4 (GOST 125-79), enclosed on both sides in a thin layer of durable cardboard. In addition to gypsum and cellulose in the production of gypsum plaster, it is possible to use various adhesives and foaming agents for the gypsum component. A perfectly flat surface and durability of drywall allow it to simultaneously act as a reinforcing frame and the basis for the finish.

70% of drywall, presented on the Russian market, is produced under the Knauf brand (Knauf). Knauf drywall products comply with Russian standards GOST 6266-97 and GOST 32614-2012, as well as the German standard DIN 18 180.

GCR classification

Technical characteristics of drywall sheets depend on which variety they belong to. According to GOST 6266-97, the following types of drywall are distinguished:

• usual - is denoted by the abbreviation GCR;
• moisture resistant - GKLV;
• gypsum board with high fire resistance - GKLO;
• material that combines the properties of a moisture-resistant material and increased resistance to open fire - GKLVO.

In 2012, a new interstate standard was adopted, developed in collaboration with Knauf. In GOST 32614-2012, put into effect in Russia since 2015, drywall is called gypsum building boards. According to the new GOST, the material is divided into 8 types:

• A - drywall, corresponding to standard GCR;
• N - moisture resistant gypsum boards;
• F - fireproof boards;
• D - plates having a given density, which depends on operating conditions;
• I - material with high hardness;
• E - facade slabs with low water absorption and minimal vapor permeability;
• P - products intended for subsequent application of gypsum plaster or tile;
• R is a material with increased bending strength in any direction.

Standard drywall

Standard or ordinary GKL (GSP-A according to the new GOST), which is also called building or basic, is most often used for decorating apartments. With his help aligned walls, sheathed ceiling and wall frames made of metal and wood. It has a light gray surface; use is possible only in rooms with normal humidity. Standard drywall.

Moisture resistant GKL

Moisture-resistant gypsum plasterboard GKLV (according to the new standard - GSP-H2) is used in rooms with medium and high humidity. The resistance of the material to moisture is achieved by adding modifiers to the gypsum that reduce its absorbency, as well as antifungal compounds. Moisture-resistant type of drywall is easily recognizable due to the green color of the surface. The scope of the moisture-resistant material is wider than that of the base gypsum board and includes such facilities as a kitchen, a bathroom, a heated loggia, an insulated balcony. GKLV can be used for the manufacture of slopes, subject to the use of high-quality waterproofing, even wall decoration in the shower is possible.

Moisture-resistant material absorbs no more than 10% moisture compared to conventional GCR.

Drywall Drywall

GKLO differs from other types of drywall in the presence of special additives in the gypsum core, providing resistance to high temperatures and preventing the spread of smoke and fire when fire. For Knauf, flame-retardant, high-density material has the designation GSP-DF.

According to GOST, the resistance of GKLO and GKLVO products to open fire should be at least 20 minutes.

The technical characteristics of this type of GCR create a separate area of ​​application: sheathing of cable and ventilation ducts, steel and wooden structures that need fire protection. The cardboard layer of the fire-resistant sheet usually has a light pink shade, the marking according to the requirements of GOST should be red. Gypsum plasterboard, denoted by the letters GKLVO (GSP-DFH2 according to the new standard), combining the properties of a fire and moisture resistant material, is used to finish wet rooms.

The most fire-resistant drywall is Knauf Fireboard, which has an additional reinforcement made of fiberglass.

Design Drywall

GKLD is a designer, flexible or arched drywall that is not mentioned in GOST 6266-97. Designed to create structures of complex curved shapes: arches, decorative elements of a suspended ceiling. The small thickness (6–6.5 mm) and reinforcement by a fiberglass reinforcing mesh allow this material to be bent without wetting.

Durable Drywall

The use of reinforced drywall is advisable for large loads on the wall, if necessary, fastening a heavy object. An example of such a material is Diamant drywall from Knauf. This manufacturer also manufactures products of large thickness (18, 20, 25 mm) called high-strength or massive plates. Such material may also be fire and moisture resistant.

Product Parameters

The main technical characteristics of drywall are regulated by the standard GOST 6266-97.

The size

The size of the drywall sheet can be different:

• The standard values ​​for the length of the product are 2, 2.5 and 3 m. There are manufacturers that produce sheets having a length of 1.5 to 3.6 m.
• The width of the sheet is usually 1.2 m, although not so long ago small-format products with a width of 0.6 m, which provide more convenient transportation, appeared on sale.
• The thickness of the sheet can be from 6 to 12.5 mm. If we are talking about reinforced plates, then we can talk about a larger thickness, reaching 25 mm. Sheets having a minimum thickness are intended for the manufacture of bent structures. Drywall 9 mm thick is used for ceiling installation, 12.5 mm for walls.

The most popular drywall format from Knauf is 250 x 120 cm.

Tip: although a 9 mm drywall is suitable for the ceiling, experienced craftsmen recommend using ceiling surface standard wall material 12.5 mm thick, providing better fastening of self-tapping screws and built-in fixtures.

The weight of sheets GKL and GKLV from Knauf does not exceed 1 kg per sq. m., fire-resistant boards have everything from 0.8 to 1.06 kg per square meter. m. If the mass of the sheet is higher than indicated, most likely, there was a violation of the conditions of transportation and storage of the material, because of which it was saturated with moisture.

Edge shape

Drywall sheets may have a different shape of the longitudinal edge. Often it has a smaller thickness, which allows you to carefully putty joints. The type of edge is necessarily indicated in the product labeling.

Knauf drywall most often has an edge like Pluck.

Sheets with tapering edges are well suited for finishing the room, when installing in several layers, it is better to use sheets with a straight edge.

Fire performance

Due to the natural properties of gypsum, any drywall is a non-combustible material that can withstand open flame for some time. There are several documents that determine the class of drywall for various indicators:

• combustibility group according to GOST 30244 - G1;
• flammability according to GOST 30402 - B2;
• the ability to form smoke (GOST1.044) - group D1;
• toxicity level (GOST1.044) - group T1.

Legend

You can learn all the information about the technical characteristics of the sheet from its marking, which includes:

• designation of the type of sheet or plate;
• information about the group to which the product belongs;
• indication of the type of longitudinal edge;
• sheet parameters (length, width, thickness);
• the standard by which the product is manufactured.