Drywall Specifications and features of this material
Entering the store construction materials, we can see the plasterboard of different brands and for different purposes.Inexperienced developer is difficult to sort out all this diversity.It is therefore necessary to know and understand the technical characteristics of the drywall.In this article you will get as much information about the characteristics and properties of gypsum boards of all grades and assignments.
- device and particularly gypsum board
- Types GCR and their applications
- categories GCR
- Types edges GCR
- Bending strength
- Flammability drywall
- ratio of drywall to low temperatures
- Water absorption coefficient softening
- thermal conductivity of plasterboard
- O loads that can withstand drywall
- What is the weight per square meter of material
- About the thickness of the sheet
- Symbols gypsum boards
device and particularly gypsum board
If somewhere there is a repair, then it is safe to say that
particularly like the ease of builders gypsum board - this is a big plus, and the installation, and transportation.When working with plasterboard waste turns a little, and scavenge much faster.Applications in the construction of drywall - the so-called "dry construction".
Easy to use material
Very convenient that the drywall does not need special tools - just the minimum, which is available in every home.Complex structures of this material may generate due to its special properties.It is enough to wet gypsum board, and you can do with it whatever you want.For example, to bend it into an arch, build a niche or to realize the intricate design project.After drying, the design will retain its shape.By the way, smooth surfaces are also excellent.
Through the use of drywall, you can significantly reduce the time spent on finishing work.Take, for example, the production of partitions.If you make it out of the traditional construction materials (brick, say), you have to spend three times more time.And the drywall does not cause allergic reactions, which is also a positive quality.
What are the disadvantages inherent in drywall
Unfortunately, there are features and characteristics of drywall that do not add him to the pros.Thus, the strength and water resistance of the material can not boast.In addition, it is difficult to attach anything.Drywall nails perforate useless - just dowels and screws are able to keep on the shelf yourself, or a picture.But still nothing really severe you should not hang up, because this could lead to the complete destruction of the wall.
insufficient water resistance
Difficulty wall mounting
Nothing complicated - structure corresponds to the name.The core of plaster with additives, and the outside - a cardboard lining.It firmly holds a special glue.Depending on the types of applications available drywall with different properties.
drywall types and their applications
Plasterboard wall (GCR)
sheets may have a length of 2.3 or 2.5 m. The width of any of them is 1.2 m. The thickness of this material is 12.5 mmcolor his gray.On the cardboard is marked in blue markings.Special additives in the core is not provided, the properties of the material - standard.
sheets in length may be 2 or 2.5 m, and the width - 1.2 m. The thickness less than that of the wall material - it is equal to 9.5 mm.Light gray cardboard liner just marked in blue.Use this type of GCR for covering ceilings, as well as for manufacturing niches, arches and multi-level ceiling structures.According to the properties similar to the preceding species, differing only in thickness.Through this way, he is less likely.
Moisture resistant drywall (gypsum plasterboard)
Sheets length of 2.3 and 2.5 m. Have a standard width - 1.2 m. The thickness is the same as that of the wall material (12.5 mm).Linerboard green, blue marking him.Applying the GCR in areas with excessive moisture, they can easily tolerate.You can improve this characteristic moisture-resistant gypsum board, if in addition to cover the wall waterproofing material.Also, this may serve as a paint or primer layer tiles.This material and the core, and cardboard have a special structure, so they are not afraid of moisture.To do this, apply antifungal treatment and special additives.
fire-resistant drywall (GKLO)
length of its leaves can be 2, 3 and 2.5 meters and the width and thickness of normal - 1.2 m and 12.5 mm.Linerboard has a light gray color, and the notation on it red.Use these GCR where fire safety requirements are high.For example, it may be lining the chimney or fireplace.Such a plasterboard core have a large number of fibers and additives intended for reinforcement.This design has reinforced outer carton liner, the fire difficult to overcome.It turns out, as it were a double frame.
note that durable cardboard used in all GCR, non-flammable and does not contribute to combustion.Maximum - he char.But the core is able to resist fire, only fire-resistant type of drywall.In case of fire, it is not destroyed, and retains its shape.
Vlagoognestoyky drywall (GKLVO)
combines the properties of water-resistant and fire-resistant gypsum board.
arch Plasterboard (flexible)
His light gray sheets have only one length - 3 m. The width is usually 1.2 m. But the thickness of the material is small - only 6.5 mm, so basically it is mounted intwo layers.From Arch drywall make different products with different curved radius.So easy they can be bent because of glass fiber filaments, strengthening core.However, due to this and the price is high enough sheets.And the fact that they have to put a double bed, even increases costs.
There are two quality categories for rectangular gypsum board - 'A' and B '.The last one allows some errors in the geometrical dimensions.The equipment used in this old model.However, the majority of manufacturers produces plasterboard only the "A" category, so they do not consider it necessary to specify this in the characteristics.But you need to know about it.
Types edges GCR
sheets standard width - 1.2 m. They are made in accordance with GOST 6266-97: inside two layers of strong cardboard is solidified mass of plaster with special additives for reinforcement.The lateral longitudinal sides of the sheet wrapped in cardboard.
There are several types of edges, used in the manufacture of plasterboard.It made for a more comfortable handling the joints between the sheets.It is worth remembering that everything ends at the GCR are always just rectangular.If you need to stitch these sides (short), then they need to about a third chamfer.
PC (straight edge) applies when the joints to seal is not necessary.
Criminal Code (edge thinning) is needed if used for sealing tape and reinforcing filler.
PLC (the front edge of the semi-circular) is used in the absence of filler and reinforcing tape.
PLUK (semicircular front edge thinning) can be used when working with the filler and reinforcing tape without the tape.
ZK (rounded edge) is used if the joints are to be repaired with plaster.
This characteristic is determined by the minimum load at which the gypsum board is able to collapse.The calculation is in kilograms.To test a sample is taken 40 cm wide and test it on supports, the distance between which is 40 times larger than the thickness of the sheet.
- Minimum load for a sheet of plasterboard 10 mm thick.is 15 kg.
- Minimum load for a sheet of drywall thickness of 11 - 18 mm.is 18 kg.
Drywall Drywall is not flammable material, besides it can withstand fire for a long time.Strictly speaking, any gypsum-containing materials can boast such qualities.
- GOST 30244 specifies the flammability - G1 drywall have it;
- GOST 30402 defines the flammability, it is at the drywall - B2;
- GOST 12.1.044 determines the ability to form smoke, according to this indicator drywall refers to a group - D1;
- GOST 12.1.044 determines the toxicity drywall refers to a group - T1.
case of fire, fire-resistant drywall characteristics allow it to staunchly resist fire.Sam gypsum can not burn, and after the destruction of the cardboard core just showered.To improve the fire resistance, the partition is made from two sheets of plasterboard.So cardboard located between two sheets longer able to resist the fire.
ratio of drywall to low temperatures
All negative temperatures are possible in nature, plasterboard perfectly maintained.It does not exhibit their destruction or fatal changes in the physical properties.As soon as the temperature rises, the sheet completely restored.It is best to feel the GCR at room temperature - and in fact they were created for in-house work.
Water absorption coefficient and softening
stamp plasterboard possessing moisture resistance (including those that, in addition, are also fire resistant) permissible moisture absorption of not more than 10 percent.Have drywall is another important parameter - the coefficient of softening Cr, which is calculated by dividing the tensile strength in a water-saturated state (RL) on the tensile strength in the dry state (Rc).
Speaking of conventional drywall sheets, the strength of their wetlands at significantly reduced.Such materials are sold quite a lot, and they all have a small softening factor of about 0.8.And here at the GCR is somewhat different this value - 0.45.This means that after the wet strength of the material greatly reduced.
thermal conductivity of plasterboard
For a start it should be noted that the plasterboard retains heat very well.Thermal conductivity at the drywall is from 0.22 to 0.35 W / (m × K).That's not bad - in fact after the repair the wall and you can immediately make a smooth and slightly improve their thermal insulation.It should be noted that this method of thermal insulation of walls is an inexpensive, fast and efficient.And if you make a gap of 3 to 10 mm, then there is an additional layer of air that helps to better preserve heat.
To achieve a good result on the thermal conductivity in the space between the insulated wall and the plasterboard laid various heaters.This could be, for example, mineral wool or ordinary plastic foam.The farther we otodvinu plaster board on the wall, the thicker you can do an additional insulating layer.
O loads that can withstand drywall
If we want to hang on the wall of plasterboard or shelf cabinet, we must remember that the load should not exceed 30 kg per square meter.
What is the weight per square meter of material
style sheets GCR and gypsum plasterboard weigh no more than 1 s (kilograms per square meter).Fireproof sheets - not less than 0.8 and not more than 1.06 s (kilograms per square meter).About
Drywall, which is sold in stores and on the market, it can often be a thickness of 6, 9, 12 mm.Most GCR thin, having a thickness of 6 mm, are used for the "wet method" - of them make complex curvilinear products (arches, designer designs, niches).Thickness of 9 mm is well suited for bending sheets "dry method" and the creation of the same arches - experienced craftsmen usually do so.Another of the nine-millimeter GCR ceilings do to reduce the weight of the structure.Most thick sheets used for cladding and creating partitions.Other dimensions are found on sale very seldom, and therefore they are usually not interested in the ordinary buyer.
Symbols gypsum boards
decipher what is written on the sheet, knowing the characteristics of gypsum board, as follows:
- letter designation of the type of sheet;
- information about which group belongs to a sheet;
- information about a longitudinal edge;
- length, width and thickness, in millimeters;
- manufacturing standard - GOST 6266-97.
For example, take a sheet of plasterboard Group "A" of the Knauf company.Its length is 2500 mm, the width of the standard, semicircular edge thickness of 9 mm.
On the sheet you will see the following marking:
GCR - A - PC - 9 × 1200 × 2500 GOST 6266-97.
GCR - PC - 9 × 1200 × 2500 GOST 6266-97.
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