Drywall is one of the solid sheet materials used to form an additional coating on top of the rough base for subsequent finishing. Gypsum is hygroscopic and afraid of water, so gypsum board can only be used for interior decoration building structures, installation of plasterboard on the ceiling is one of the areas of its application.
Let's consider which drywall is preferable for ceiling finishing.
Requirements for gypsum boards for ceiling placement
The ceiling is a specifically located base, so additional requirements are imposed on the materials for its finishing. Drywall today is produced in several types, differing in characteristics and, accordingly, scope and methods of application. To choose plasterboard for ceiling finishing correctly, you need to know the selection criteria, which, in turn, are based on the following requirements for covering a gypsum plasterboard ceiling:
- Acceptable specific gravity - any suspended structure is affected by gravity and the lighter the structure, the less likely it is to be torn off from the base;
- Rational functionality - the degree of resistance of the material to certain factors must correspond to operating conditions, and its reserve must be in demand;
- Possibility of arranging joints of sheets with required quality– the requirements for connecting seams for finishing with painting and wallpapering differ.
Based on the listed requirements for the material, we will consider the appropriate selection criteria and which type of plasterboard to give preference to for installation on the ceiling.
Choosing gypsum boards for the ceiling
In relation to some types of plasterboard, you can hear the definition “ceiling”, but it is used only in everyday life - gypsum plaster boards with this name or marking are not produced, just as ceiling chipboards, fiberboards or plywood are not produced. The characteristic “ceiling” is conditional and implies a smaller thickness of the sheets, which means their lower weight.
Ceiling plasterboard thickness
GKL is available in the following thicknesses (mm): 6.5; 8.0; 9.5; 12.5; 14.0; 15.0; 16.0; 18.0; 20.0; 24.0. For domestic use, plasterboard manufacturers offer three of the listed types - 6.5, 9.5 and 12.5 mm thick, the most common in the retail chain. GKL with a thickness of 9.5 mm is commonly known as ceiling, the weight of 1 m2 of such material is approximately 7.5 kg - this value differs slightly for ordinary, moisture-resistant and fire-resistant materials.
Sheets with a thickness of 6.5 mm are called arched, although they are most often used on the ceiling - for cladding structures of complex shapes.
Recommendations for the use of gypsum board sheets 6 or 9.5 mm thick on the ceiling, according to the definition of “ceiling”, are not categorical and universal. A single-level covering can also be mounted from 12.5 mm thick plasterboard - many even prefer this size over thin material, since it gives the structure some additional strength. Taking into account the increase in the weight of 1 m2 of sheet by at least 2 kg, the pitch of the load-bearing CD profiles of the frame for laying gypsum boards should be done not at 60, but at 40 cm - with a standard plasterboard width of 120 cm, such an arrangement is not difficult.
If the suspended ceiling is arranged multi-level, the load on the metal structures of the covering closest to the load-bearing base increases, so finishing this tier with sheets 9.5 mm thick is not always justified - if the frame is insufficiently rigid, cracks may appear at the gypsum board joints. In such cases proceed as follows:
- To finish the horizontal sections of the first level of the ceiling, plasterboard with a thickness of 12.5 mm is purchased;
- For horizontal lines of the second and third tiers, gypsum boards of 9.5 and 6.5 mm are selected;
- Vertical surfaces of all levels are faced with arched (6.5 mm) plasterboard.
When choosing the thickness of gypsum boards for multi-tiered coatings, you should also take into account the nuances finishing suspended ceiling. If you plan to use decorative overlays to decorate the surface, then their weight should be taken into account. It is better to place wood products on 12.5 mm thick plasterboard - on the first tier of the ceiling. Elements made of polystyrene foam can be placed at any level of the coating - their weight is low.
Sites hanging finishing oval shapes, with complex decorative interfaces of planes and without overhead decorations, it is better to form from gypsum board with a thickness of 6.5 mm - thicker drywall is more difficult to bend, and it is also heavier.
Degree of moisture resistance of gypsum boards for ceilings
Cardboard-wrapped sheets Green colour with blue markings is moisture-resistant plasterboard (GKLV), which can be used in rooms with air humidity up to 80%.
In dry rooms, ordinary sheets can also be mounted on the ceiling - in a gray shell, but even in such places the occasional presence of steam cannot be ruled out, for example, from the neighboring kitchen, or a pinpoint leak of water from the apartment above. A gypsum board coating will cope with these factors, but for ordinary drywall, even short-term such effects will not pass without leaving a trace - the material will absorb moisture and become deformed. Conclusion: even in dry rooms, it is better to install moisture-resistant plasterboard (GKLV) on the ceiling - the difference in the price of the material for this potential is completely justified.
Ceiling coverings made of gypsum board with a thickness of 12.5 mm, with significant leaks, retain their geometry longer than moisture-resistant material of 9.5 mm.
Fireproof plasterboard for the ceiling
This material is produced in thicknesses of 12.5 and 15 mm in a cardboard shell Pink colour. The gypsum component of GKLO contains inclusions of fire-resistant clay and crystallized water (1% of the total mass), is impregnated with fire retardants, and the middle layer of the sheet is reinforced with fiberglass - all this allows fire-resistant plasterboard to withstand open fire within an hour, unlike conventional gypsum plasterboard, which under such conditions will collapse in 20-25 minutes. Specific gravity GKLO is 850 kg/m3, which is 50 kg more than regular drywall– this should be taken into account when installing the frame.
Fireproof plasterboard is used as passive protection from fires - for finishing communication shafts and chimneys, creating partitions with internal arrangement of electrical cables, equipping rooms with strict fire safety requirements.
GKLO is twice as expensive as regular drywall, so its use in an apartment must be justified. In the absence of structures that are subject to strong heating or require fire-retardant finishing, the use of fire-resistant plasterboard in housing is inappropriate - its fire resistance will remain unclaimed, and it does not have an advantage in strength over other types of gypsum plasterboard.
The same can be said about GKLVO (moisture- and fire-resistant plasterboard) - if there is no need for such a material, the costs of purchasing it for home decoration will be unjustified, but there is no prohibition on its use.
GKL edge profile for ceiling finishing
Depending on the method of arranging the seams, plasterboard is produced with a working edge of the following 5 types:
- Straight (PC) – without filling joints;
- Semicircular with front side(PLC) – with putty without reinforcement;
- Rounded (ZK) – with filling of joints without reinforcement;
- Semicircular thinned (PLUK) - filling joints with subsequent reinforcement and puttying;
- Refined (UK) - with reinforcement and subsequent putty.
The material is selected with an edge corresponding to the type of finishing. Considering that plasterboard coverings, especially ceilings, are susceptible to cracking, the seams of sheets for painting or wallpaper should be firmly sealed and finished smoothly.
Therefore, it is necessary to use gypsum boards with PLUK or UK edges - they are designed to seal sheet joints with reinforcement with mesh tape, which will be recessed locally into the structural groove and then hidden flush with the surface with putty.
Conclusion
Knowing the criteria for choosing plasterboard for finishing the ceiling turns the purchase of this material into a simple procedure, but you should also remember other requirements for gypsum boards, for example, the integrity of the sheets, the absence of fixed deformations of the products, as well as dents, dirt and traces of wetting on their surface - evidence of improper storage of the material , fraught with problems when performing finishing.
The idea of selecting drywall for finishing a particular structure will be more complete after watching this video:
Calculate the cost of installing drywall on the ceiling!
Make a list of works and get a cost estimate in 10 minutes from crews and craftsmen!
The building materials market offers wide choose drywall. As a rule, the price depends on the properties of the material, so in order not to overpay, you need to understand the features of each type of drywall. We will tell you what kind of drywall there is, and decide for yourself what is best for you.
Ordinary plasterboard sheet (GKL)
This is the most common type. The popularity of gypsum plasterboard is explained by its versatility; it is suitable for installation in any room: office, residential, industrial, with standard humidity levels.
Info! Externally, gypsum boards are a gray sheet with blue markings.
Fireproof plasterboard sheet (GKLO)
Fireproof plasterboard has increased resistance to open flames. This is achieved by adding reinforcing substances to the sheet core. GKLO is rarely used for finishing residential premises. It is more appropriate to use it for the renovation of premises with increased fire safety requirements. For example, warehouse and industrial premises, ventilation, attics, power supply panels, transformer substations, securities storage facilities.
Info! The marking color for fire-resistant plasterboard is red.
Moisture-resistant plasterboard sheet (GKLV)
Antifungal substances and silicone granules are added to the composition of GKLV gypsum. This makes drywall sheets less sensitive to high humidity. The basis for GKLV is impregnated cardboard. For achievement maximum effect moisture resistance, the front side of such drywall is usually covered with a finishing material that has moisture-resistant properties. It can be waterproof or varnish.
Most often, gypsum plasterboard is used in the renovation of bathrooms, toilets, garages, and car washes. Although, if you have a high probability of being flooded by your upstairs neighbors, you can install moisture-resistant cardboard in any other room.
Info! GKLV sheet is green with blue markings.
GKLVO
Moisture-resistant, fire-resistant plasterboard sheet is a combination of the key properties of GKLV and GKLO. The most advanced type of drywall is, naturally, the most expensive. IN production premises, with strict safety requirements and operating conditions, use only GKLVO. Like gypsum plasterboard, it tolerates high levels of humidity.
Info! It is usually green in color, with red markings.
Types of edges of plasterboard sheets
An important parameter when finishing a surface with plasterboard is the shape of the edge of the sheet.
There are the following options:
Straight edge (SC) - used for “dry installation”. If the drywall layer is not the top one and the joints will not be treated with putty, then PC is suitable.
Thinned edge (ED) - after installing drywall, it is assumed to use reinforcing tape and subsequent treatment with putty.
Rounded edge (ZE) - similar to ED, but without the use of reinforcing tape.
Semicircular edge on the front side (PLC) - similar to SK, but has a rounding on only one side; it can also be puttied without tape.
Semicircular thinned edge (PLUK) - the joints between such sheets should be treated with both tape and putty.
How to choose drywall thickness
The standard thickness of plasterboard for the ceiling is 9.5 mm, but experts advise taking a denser option - 12.5 mm. The heavier the sheet, the more difficult it is to work with, but 12.5 mm plasterboard is more reliable in operation.
Types of profiles for drywall
Once you have decided on the sheets and their subtypes, it is worth figuring out how to choose a profile for drywall.
There are two main types of ceiling profiles: CD and UD (the marking of ceiling profiles ends with the letter D).
UD profile
Parameters for UD: width - 25 mm, thickness - 25 mm, length from 30 to 40 cm. The thickness of the metal depends on the manufacturer, on average it varies from 0.4 to 0.5 mm. The middle plate of this profile is profiled, so it is stronger and stiffer than the side ones.
The UD profile performs an auxiliary function; it is used as a CD mount.
CD profile
Almost the entire load from drywall falls on the shoulders of the CD. Each sheet is attached to at least four such profiles.
CD parameters: width - 60 mm, height - 25 mm, length - from 30 to 40 cm. The metal thickness is the same as that of the UD profile, from 0.4 to 0.5 mm. The CD is fully profiled, which gives additional rigidity.
Among the building materials provided by the modern construction market, plasterboard occupies one of the leading places. It completely replaced plaster, is easy and quick to install, very convenient and does not require high costs.
But still, when finishing different surfaces use required different types drywall, which mainly differ in size. For example, to finish the ceiling you need to know the parameters and size of the ceiling plasterboard in order to calculate it correctly required amount and purchase the most suitable material for this purpose.
Differences in the sizes of plasterboard boards allow you to choose among them the most suitable for a particular job.
They have their own standards, according to which they differ from each other.
- All types of plasterboard boards have the same width, which is 1.2 m.
- The length of the sheets can be from 2 to 3.6 m.
- Sheet thickness ranges from 6.5 to 12.5 mm.
Having learned to determine the required type of drywall for certain type finishing, you will become a real professional in your field!
Types of plasterboard sheets
So, let's start with the thinnest drywall, the thickness of which is 6.5 mm. This is arched drywall. Thanks to such a small thickness, it easily lends itself to any bends.
The thickest is wall plasterboard(12.5 mm), which is ideal for leveling wall surfaces and for creating all kinds of partitions, niches and other structures that require a certain rigidity.
The thickness of the ceiling plasterboard ranges from 8 to 9.5 mm, has a lightweight structure, which helps reduce the total weight of the suspended ceiling and allows you to save on the number of profiles. By reducing the total weight of the ceiling, it became possible to make the distance between the ceiling profile slats wider when installing a frame for a suspended ceiling.
In addition, ceiling plasterboard is much cheaper than wall plasterboard. same sizes, due to the difference in sheet thickness.
The following table shows the dimensions and weight of different types of drywall famous manufacturers:
|
Drywall Knauf |
||
| View | Size(mm) | Sheet weight per 1 sq.m (kg) |
| GKL |
1200x2500-4000x9.5 |
|
|
1200x2500-4000x12.5 |
||
|
1200x2500-4000x15 |
||
|
600x2000-3500x9.5 |
||
| GKLV |
1200x2500-4000x9.5 |
|
|
1200x2500-4000x12.5 |
||
|
1200x2500-4000x15 |
||
| GKLO |
1200x2500-4000x12.5 |
|
|
1200x2500-4000x15 |
||
| GKLVO |
1200x2500-4000x12.5 |
|
|
1200x2500-4000x15 |
||
|
Drywall GYPROC* |
||
| GN 13 |
1200x2400-3600x13 |
|
| GEK 13 |
1200x2400-3000x13 |
|
| GTS 9 |
1200x2700-3000x9 |
|
| *GN 13-regular, GEK 13-high strength, GTS 9-windproof | ||
The length and width of the plasterboard slabs are selected to suit different needs, and is the same for all types of slabs. There are such variations: 2000x1200mm, 2500x1200mm and 3000x1200mm.
Drywall classification
Ceiling plasterboard is classified as follows:
- Ordinary drywall (GKL) - used for finishing rooms with normal humidity levels. Its thickness can be minimal and range from 8 to 9.5 mm.
- Moisture-resistant drywall (GKLV) - used in rooms with increased humidity, for example, a bathroom or kitchen, and has a reduced level of water absorption. Special ceiling option not provided here, however, the thinnest versions of ordinary waterproof material can be used.
- Fire-resistant plasterboard (GKLO) - used in fire hazardous areas. It is universal, and when choosing a ceiling option, it is also recommended to choose a thickness of up to 9 mm.
How to calculate the required number of plasterboard sheets for the ceiling?
The calculation must begin by determining the length and width of the room. Be sure to measure all four walls to avoid possible curvature. If any deviations are found, you need to take larger values as a basis, because it is better to have a surplus than a shortage!
For example, let's take a living room of 5.6x3.1 m. Here, the most rational size of the ceiling plasterboard is 1.2x2.5 m, which will allow them to be used most effectively, with the least amount of waste, using the technology in a running pattern (see diagram).
The sheets will be placed lengthwise across the room, 3 of which must be cut in half, fitting them to required sizes. Mounting the last row, the sections must be cut in width from 1.2 m to 0.8 m. As a result of calculations, we will get 8 sheets for covering the ceiling (excluding the reserve just in case).
Thus, knowing the differences and dimensions of different types of drywall, you can calculate the amount required material for ceilings of any size. I would like to believe that the information and recommendations contained in this article will help you when choosing the necessary material and performing renovations in your apartment!
Often a great idea to cover the ceiling surface with gypsum board comes up against the problem of choice. It is clear that you can use the first ceiling plasterboard that comes to hand, but if you have the opportunity to choose, it may be right to choose a more suitable material, and not one that is cheaper or simply available.
The transverse size of the sheet should not exceed 100-120 cm
Pros and cons of ceiling plasterboards
To be precise, the industry does not formally produce gypsum sheets specifically for plasterboard cladding of floors. It’s just that from a fairly wide range of gypsum boards they distinguish sheet material, the best way suitable for ceiling decoration.
Most experts classify primarily lightweight grades of plasterboard that meet at least two requirements as ceiling plasterboards:
- Small thickness of sheet cladding. On average, the thickness of plasterboard for the ceiling is 6-9 mm. All other brands are usually classified as wall and frame products;
- A special shape of the end edge, which simplifies the sealing of seams in an inconvenient ceiling position of the cladding.
It cannot be said that the most expensive materials are used for ceiling cladding. thin sheets plasterboard, although most customers, without hesitation, choose a thickness of 6-8 mm, believing that this approach reduces the load on the frame or rough lining of the floor.
Edge design options
Important! The thickness of the gypsum plasterboard for the ceiling is not selected arbitrarily, but based on data about the nature of the room, design features ceiling frame or sheathing and floor dimensions.
The advantages of the material include more high density and material hardness. If a complex configuration is being built on the floor, then the use of a thin arched plasterboard sheet significantly simplifies the assembly and smoothing of curved surfaces.
The disadvantages of plasterboard cladding include an increased tendency to cracks. The small thickness of the ceiling plasterboard forces you to limit the size of one section, otherwise lift and install the sheet big size It becomes simply impossible. Moreover, even with relatively small size ceiling plasterboard 120x250 cm, bring and lift the material into the apartment according to flights of stairs becomes a real challenge.
What kind of plasterboard is used for the ceiling?
The list of sheet gypsum materials for finishing the ceiling surface usually includes two main brands:
- Waterproof gypsum board sheet;
- Standard gypsum sheet with paper covering up to 1.5 mm thick.
For your information! An arched transition or curved surface, assembled from thin and relatively soft arched plasterboard, after wetting, easily bends during installation, and after drying, it gains the necessary rigidity and density for finishing.
In addition, in houses with a potbelly stove or cast-iron fireplace and a pipe leading through the ceiling, you can use fire-resistant GKLO grade plasterboard for the ceiling. But this is an exception to the rule rather than a common practice. Fire-resistant material is noticeably more expensive than ordinary drywall, so it makes no sense to hem the entire surface with it.
Standard plasterboard
A regular plasterboard sheet is a sandwich of cardboard or a thick three-layer paper shell with a gypsum core. The material cuts well required angle almost any instrument. Standard Sheet usually has a rectangular or semi-rounded end.
Working with standard material is much easier and simpler
If you plan to finish the ceiling with small pieces of plasterboard, then you can use material with straight ends; the rigidity of the section is quite enough so that the sealing at the seams does not crack under load. To finish the ceiling with full-length sheets, it is imperative to use material with one-sided rounded edges. In this case, the side with the rounding should “look” at the rough floor. After gluing the serpyanka and sealing it with putty, a kind of plaster plug is formed on the rounding, which prevents the material from peeling off.
Moisture-resistant ceiling plasterboard
Quite an expensive material, used for ceilings in limited quantities. Usually from moisture-resistant plasterboard build relatively simple single-level ceilings for rooms with high air humidity. This could be the bathroom or kitchen.
Waterproof grade of drywall finish
Important! GLKV ceiling plasterboard does not allow moisture to pass through only if the joints are carefully sealed, so before applying putty, glue or an acrylic primer must be applied to the cut edge of the joints.
Which drywall is best for the ceiling?
Choice suitable material for ceiling finishing is largely determined by operating conditions and temperature conditions premises. So, for example, for complex multi-level ceiling structures They almost always use standard gypsum plasterboard, not because the technology requires it, but because of the cheapness and availability of the material.
Standard plasterboard is ideal for lining wooden ceilings
Usually in this case facing material laid directly on the rough ceiling boards. This base is much stronger and stiffer than a frame made of metal profile, therefore, you can use 9-12 mm thick plasterboard for the ceiling.
For finishing with water-based or water-dispersed paints, water-resistant grades of drywall are traditionally chosen. It is believed that protective film prevents moisture from “pulling” impurities from cardboard and plaster, which can appear on the ceiling in the form of stains.
In addition, waterproof plasterboard is noticeably stiffer than standard, so if you plan to cover the ceiling with your own hands, without helpers, then perhaps it will be the best option. At the very least, it is possible to lift a sheet of drywall onto the frame without particularly worrying about its integrity.
For city apartments in panel houses It is recommended to use a new product, the so-called acoustic plasterboard. The structure of this material differs from standard plate only by the presence of perforated holes. It perfectly dampens noise of any frequency, but is extremely difficult to install on a frame.
Size of plasterboard sheet for ceiling
Standard dimensions of ceiling material are shown in the table below.
The most popular sheet sizes are 120x200 cm and 120x250 cm. This does not mean that sheets 3 m long or more are not used for ceiling decoration; it is simply impossible to transport and lift sheet cladding into an apartment or house without special equipment.
For example, one plasterboard of the most popular ceiling plasterboard 120x200 cm weighs almost 18 kg. It can without special effort lift one physically strong person. That is why it is often purchased for ceiling decoration in apartments.
How sections will need to be lifted to the ceiling
If a team of craftsmen will work on finishing the ceiling, then focus on maximum size plasterboard does not make sense; in this case, the finishing is purchased based on considerations of a more rational use of plasterboard in ceiling finishing.
What thickness of drywall is best for the ceiling?
It is much more difficult to decide on the thickness of the gypsum board than on its dimensions. At a minimum, three factors must be taken into account:
- Room dimensions. The larger the ceiling area, the more flexible and uneven the frame under ceiling decoration. Therefore for large room or the hall they take mainly a sheet of 9.5 mm. And if it is planned a large number of embedded elements and inserts, then you may need a thicker one - 12.5 mm;
- Character of finishing. If on ceiling frame, in addition to drywall, will be laid ceiling PVC film, then most of the tiers are assembled from thin gypsum sheet of 6-8 mm;
- Total weight of the ceiling cladding. The less the load on the frame, the more durable the decorative finish will be.
Oddly enough, the last point is almost always ignored, both by masters and individual homemakers. There is an opinion that one linear meter The profile frame can withstand up to 30 kg of drywall. That's not entirely true maximum load should not exceed 10 kg. If you cover the ceiling of a room of 12 m2 with ceiling plasterboard, sheet dimensions 120x250 cm, thickness 9.5 mm, then the total weight for 4 profile lines will be almost 90 kg, which gives an almost double safety margin.
With proper skill, moving the cladding is not a problem
If you use a 12 mm ceiling gypsum board, the margin will be only 15%, which means that any error during assembly metal frame may cause the entire structure to break.
Conclusion
Ceiling plasterboard can be considered one of the most successful species lining the space above your head. Relatively easy to process and environmentally friendly, gypsum sheet does not create problems for apartment owners and can last quite a long time, at least 20 years, provided proper planning and installation on the frame.
Drywall is one of the most popular finishing materials, which is often used when installing suspended ceilings. GCR is multilayer construction, which is based on a gypsum core, reinforced on the outside with cardboard. The raw material may contain additional additives that make it moisture-resistant or fire-resistant. Let us consider in detail what type of plasterboard is suitable for finishing the ceiling and what criteria should be used to select the material.
Selecting the type of plasterboard depending on the purpose of the room
First of all, it is necessary to assess the conditions in which the ceiling will be used. In order for the material to retain its properties in a particular environment for as long as possible, it is important to choose the right type of gypsum plasterboard. Manufacturers have developed four types plasterboard sheets:
- Ordinary (GKL)- used in dry rooms with normal level humidity. Sheets are painted in grey colour, markings are applied in blue ink.
- Fire resistant (GKLO)- are produced for premises with high temperature or increased level of fire hazard. The sheets are intended for attics, areas near heating devices, fireplaces. The material can withstand up to 20 minutes of exposure to an open flame. GKLO and markings are red.
- Moisture resistant (GKLV)- installed in rooms with humidity up to 85%, for example, bathrooms, kitchens, balconies. To improve the properties, waterproof plasterboard is additionally treated with special primers and protective coatings. The water absorption of the sheet is no more than 10%, which is achieved by including silicone granules and other hydrophobic substances, as well as antifungal drugs. GKLV is produced in green color, the marking is blue.
- Moisture-resistant (GKLVO)- combine the properties of water- and fire-resistant products suitable for attics and wooden houses. The material is presented in green with red ink markings.
Another type of product is “acoustic” drywall. These are perforated plates with a sound-absorbing layer applied to the back side. Suitable for installing frame and suspended ceilings frameless way in rooms with normal humidity levels. Soundproofing plasterboard is produced in lilac color with a special edge shape.
They also produce gypsum fiber sheets. Due to the use of cellulose in the composition, strength characteristics increase. A nail hammered into such a slab can withstand a load of more than 30 kg.
Optimal dimensions and thickness of plasterboard for the ceiling
GKL are produced in thicknesses from 6.5 to 24 mm. In everyday life, sheets of 6.5, 9.5 and 12.5 mm are used. The plasterboard for the ceiling has a thickness of 9.5 mm. For curly suspended structures intended arched variety- 6.5 mm. In practice, 12.5 mm gypsum plasterboard is also used in finishing due to its greater strength.
The selection of thickness also depends on the number of tiers in the ceiling structure. For multi-level ceilings use:
- 12.5 mm - first layer;
- 9.5 mm and 6.5 mm - second and third;
- 6.5 mm - for cladding vertical surfaces of boxes of all levels, construction of oval and complex shapes.
When choosing thickness, take into account finishing coat. For heavy finishing materials, a 12.5 mm sheet will be required. Imitation modeling made of polystyrene foam, which weighs extremely little, is even attached to arched gypsum boards.
Pay attention to the dimensions of the drywall. Standard width- 1.2 m, length - from 2 to 3.6 m. The parameters of the sheet must be such that it does not bend during installation. The dimensions of the room are also taken into account. The dimensions of the ceiling plasterboard should be selected in accordance with the design. So, for a spacious room it is better to take larger sheets to reduce the number of seams and joints, and for a small box it is worth purchasing gypsum board of the appropriate width - you will get a minimum of waste.
Ceiling plasterboard weight
According to GOST 6266-97, the weight of 1 m² of gypsum board with a thickness of 1 mm must comply with the following standards:
- waterproof and regular - no more than 1 kg;
- fire-resistant and moisture-resistant - no less than 0.8 and no more than 1.06 kg.
You can calculate how much weight the ceiling plasterboard will have on your own. Thus, the area of a regular gypsum board measuring 1.2x2.4 m is equal to 3 m²; with a thickness of 9.5 mm, the sheet should weigh no more than 28.5 kg. Based on 1 sq. m will be approximately 7.5 kg.
Note! Calculating the load on ceilings, it is also necessary to take into account the weight of the metal frame and the finishing coating.
What type of edge to choose for finishing the ceiling
The edge of the plasterboard sheet can be decorated in one of the following ways:
- PC (SK)- straight, rectangular edge, dry mounted, joints do not require sealing.
- УK (AK)- thinned on the front side, before puttying, the seams are covered with reinforcing tape.
- PLC (HRK)- semicircular with outside, joined without reinforcing tape followed by putty.
- PLUK (HRAK)- semicircular and thinned on the front side, requires the use of reinforcing tape and putty.
- ZK (RK)- rounded edge on both sides; during installation, the joints are only puttied.
The sheet must have an edge that matches the type of finish. It is also necessary to take into account that ceiling covering made of plasterboard is susceptible to cracking. Therefore, before painting, the seams between the sheets are firmly sealed and smoothly finished.
For ceiling structures, it is better to choose PLUK or UK edges. They are designed to use a reinforcing mesh, which is covered with a layer of putty on top. Builders believe that a more reliable joint is made between sheets with a PLUK-type edge.
There are several reasons for this. A 1–2 mm layer of putty, which is applied to the edge of the crack, is not enough. Plasterboard construction experiences loads, the building shrinks, and changes in humidity affect the finishing. The putty must withstand this influence. Therefore, the seam is stronger if a sheet with a PLUK edge with a thicker layer of leveling mixture is used. But it is worth considering that the wider the seam (for UK - 90 mm), the less noticeable the bumps are. In this regard this type edges are more profitable.
Popular manufacturers
There are several factories on the market whose products are of stable quality and whose performance properties are time-tested.
Knauf
This is one of the most famous manufacturers of building materials. According to estimates, more than 70% of this brand of plasterboard is sold in Russia.
Knauf's product range includes not only different kinds GKL, but also related products - profiles, putty, reinforcing tapes. This makes installation of the system as comfortable and quick as possible. The sheets have a low specific gravity, which reduces the pressure on bearing structures. GCRs are odorless and have increased flexibility.
Gyproc, part of the Saint-Gobain group (France), one of the most large manufacturers plaster building slabs in the world. Factories present the entire range of products for suspended ceilings - from gypsum boards to reinforcing tapes. The raw materials contain no harmful substances. Construction Materials are recyclable.
One of the new products from this manufacturer is the Habito plasterboard. It is characterized by increased strength, thanks to which it can withstand heavy objects with a load of up to 60 kg per screw without embedded parts or dowels. Habito are characterized by increased fire resistance and sound insulation.
This is a Russian manufacturer of plasterboard sheets, which occupies second place in the country's market in terms of sales volumes. All types of gypsum boards, including soundproofing ones, are produced under the Volma brand.
Features of gypsum plasterboard storage
Before installation suspended ceiling the sheets must be dried. The material is left in a closed, warm room for 2–3 days. There must be at least 1.5 meters to the heating source.
Drywall is placed on pallets. If there is not enough space in the room, the material can be leaned on the walls. But you need to place it so that the angle with the supporting surface is as small as possible and the sheets are located almost parallel to it. They are covered with film on top.
If there is no frost or precipitation, drywall can be left outside, but for no more than 1–2 days. However, it must be in waterproof packaging.
For long-term storage GCRs are placed on pallets with a height of at least 10 cm or any other objects. If you leave a stack on the ground, the sheets may become wet and unusable. The material is covered with a film on top, protecting it from dust, contamination, and partly from mechanical damage. In this case, the material cannot be placed vertically, since it will deform under its own weight. It is not recommended to place more than 15–20 sheets in one stack, since the bottom ones may burst.
The temperature in the room for short-term and long-term storage of drywall should not fall below 10°C, the optimal values are 16...18°C. The recommended humidity level is no more than 75%. A mandatory requirement is good ventilation, air circulation volume - from 3 m³/h per 1 sq. m.
If these rules are followed, the shelf life of gypsum boards is unlimited. High humidity and insufficient air exchange lead to the formation of condensation and mold, the top paper layer is destroyed.
GKL is a convenient, budget-friendly and aesthetic material for finishing an apartment. If you take into account the recommendations of experts regarding what type of plasterboard is best to use for the ceiling and adhere to storage rules, the structure will last for decades.
