lightgage steel joist
Light steel keel is one of the most commonly used ceiling materials at present. It is a metal skeleton material made of high-quality continuous hot-dip galvanized sheet by cold bending process. It is mainly used to build supports for ceilings and partitions.
Light steel keel is moisture-proof, fire-proof, hard, strong in impact resistance, simple, convenient and time-saving in installation, so it is favored by owners. However, light steel keel also has shortcomings, it is not suitable for special modeling, only suitable for straight line and simple right-angle modeling.
How to choose light steel keel?
When purchasing light steel keel, carefully check the galvanized layer of light steel keel, mainly to see whether the galvanized layer is complete or not. The galvanized surface of good quality light steel keel is generally snowflake-like, with clear patterns, and all of them have been treated with rust prevention. The following figure shows the galvanized components.
In addition, pay attention to check whether the surface of light steel keel is flat and straight without deformation, damage or defect, and whether the incision has burrs.
There are many models of light steel keel according to the different ceilings and walls.
The light steel keel of the ceiling can be divided into main keel and secondary keel, and the secondary keel is mainly used in conjunction with the main keel. The model of main keel is divided into three series: D38, D50 and D60.
When purchasing light steel keel, we should not only pay attention to the model, but also choose the section shape.
Section shapes are mainly divided into four categories:
V type, c type, t type, l type.
V-shaped keel is mainly used to support the main keel of ceiling, C-shaped keel is used to partition the load-bearing keel, T-shaped keel and L-shaped keel are mainly used for ceiling, T-shaped keel is the main keel, and L-shaped keel is the side keel.
Wooden keel
Wooden keel, commonly known as wood square, is made of wood strips. Wooden keel is one of the most commonly used skeleton materials in home decoration at present. Wooden keel is mainly divided into: ceiling keel, vertical wall keel, floor keel, hanging keel, etc. The advantage of wooden keel is that it is cheap and easy to construct. But the wooden keel itself also has many problems, such as flammability, mildew and decay.
The wooden keel of the ceiling is generally Pinus sylvestris var. mongolica and Pinus sylvestris var. mongolica, of which pine is the majority. Wooden keel has the characteristics of simple operation, convenient construction and easy adjustment. Its main function is to support the ceiling, floor and dado, which is equivalent to a bracket.
What are the specifications of wooden keel?
Choose different specifications according to different parts of use. There are primary and secondary wooden keels for ceiling:
The specifications of the main keel are generally 30mmX40mm, 40mmX60mm,
The specifications of the secondary keel (auxiliary keel) are generally 20mmX30mm, 25mmX35mm, 30mmX40mm；;
The floor keel used to support the floor is generally 25mm40mm and 30X40mm；;
The specification of wooden keel used to support dado is generally 10mmX30mm.
These figures are usually difficult to remember. I suggest you collect this article for reference when necessary.
How to choose wooden keel?
High-quality wooden keel with bright red color and clear texture. Second, look at the details. There should be no scars, bark, insect eyes and cracks on the surface. Third, look at the straightness. When choosing wooden keel, the wall should be bent straight, and bending wooden keel will lead to the deformation of the whole skeleton.
Secondly, the quality of wooden keel can be distinguished by moisture content. Although the determination standard of moisture content is different in different regions, it is most appropriate not to exceed 15%. The high-quality wooden keel has a high density, and the intuitive feeling is that it is solid in the hand, elastic when pressed by hand, easy to recover after bending, brittle when knocked, and there is no obvious trace when pressed with nails.
Finally, see if the section size is accurate.
Plasterboard
Paper gypsum board has been used for more than ten years. Widely used in residential buildings, office buildings, shops, hotels, industrial plants and other buildings, such as internal partition walls, wall composite panels (instead of wall plastering), ceilings, sound-absorbing boards, paper plasterboards. It is both a covering layer and a decorative layer, and its environmental protection has been tested for a long time.
Common specifications of gypsum board
Length:1800,2100,2400,2700,3000,3300,3600;
Width: 900, 1200
Thickness: 9.5, 12.0, 15.0, etc.
Can also be based on user requirements, the production of other specifications and sizes of plates.
What are the classifications of common gypsum boards?
Ordinary gypsum board: ivory white board core and gray board core, which are the most economical and practical varieties. Generally, the ceiling is made of ordinary gypsum board with a thickness of 9.5mm, and the partition wall with a thickness of 12mm is used.
Water-resistant gypsum board: its core material and cover paper have been waterproof. According to the national standard, the paper surface and core material of waterproof gypsum board must meet certain waterproof requirements (the surface water absorption rate is not more than 160g, and the water absorption rate is not more than 10%). Water-resistant gypsum board is suitable for places where the continuous relative humidity does not exceed 95%, such as toilets and bathrooms.
Refractory gypsum board: refractory materials and a large number of glass fibers are added to the core of the board. If you cut the gypsum board, you can see a lot of glass fibers from the cross section. Good quality fire-resistant gypsum board will use alkali-free glass fiber with good fire resistance.
Moisture-proof gypsum board: the surface has high moisture-proof performance, and the surface water absorption is less than 160g/㎡. Moisture-proof gypsum boards are used for ceilings, partitions and decorative walls in rooms with high environmental humidity.
How to choose gypsum board?
When choosing gypsum board, pay special attention to its paper surface. Generally, gypsum board is easy to crack from where the paper is damaged. The paper surface of high-quality gypsum board has been specially treated, which is very tough and will not be damaged. In addition, gypsum core board has strong adhesion to tissue paper, and gypsum board with weak adhesion to paper is easy to be damaged. When you buy gypsum board, you can try to uncover this paper and feel it.
It is important to have a flat appearance. Because gypsum board is generally decorated directly with latex paint, its surface smoothness and smoothness are very important. The surface of high-quality gypsum board should be flat and smooth, and there should be no defects such as pores, stains, cracks, uneven colors and incomplete patterns.
At the same time, the upper and lower layers of kraft paper on the gypsum board should be pasted firmly, which can prevent the gypsum board from cracking and prevent the screws from cracking the gypsum board.
Look at the side again to see if the gypsum board is dense and hollow. In jargon, "the greater the density, the more durable it is."
Check the texture, elasticity and weight of gypsum board. Tap the gypsum board with your hand. If it makes a solid sound, it means that the gypsum board is dense and durable. If it makes a hollow sound, it means that the board is empty and the texture is not good.
Secondly, you can lift both ends of the gypsum board and observe the radian in the middle. A good gypsum board won't bend too much. You can also shake the gypsum board at both ends, and the ones that are not broken are qualified products.
Look at these signs. The packaging box of regular products should be marked with product name, trademark, quality grade, manufacturer's name, production date, moistureproof, handle with care, product logo, etc. The quality grade of decorative gypsum board is divided according to the allowable deviation of size and the right angle deviation of flatness. The higher the grade, the smaller the deviation.
cross band
Blockboard is commonly known as large core board. The upper and lower sides are integral plywood, and the middle is glued splicing board. The so-called "big core" actually means that the "core" in the middle is very thick. The joinery board has high lateral bending stiffness, good nail holding force and waterproof performance. In home decoration, there are many large-scale woodworking plates that must be nailed, such as ceiling modeling base.
How to choose joinery board?
When buying blockboard, people are most worried about its environmental protection. Because the blockboard uses more glue, the formaldehyde content is high. So when buying, we should pay attention to check the content of toxic substances. The simple way to check is to smell. If there is a pungent smell, you can give up the idea of buying. This sniffing method is not scientific, but it has a strong smell, whether it is toxic or not, and it is definitely not suitable for home use.
The blockboard must have clear environmental protection standards, and the E 1 products of regular manufacturers must be purchased when purchasing.
Usually, the thicker the surface of blockboard, the better, because its bearing capacity and deformation resistance will also be strengthened.
Blockboard has the characteristics of good screw grip, high strength, firmness, sound absorption and heat insulation. And the water content is not high, ranging from10% to13%. It is easy to process and has the widest application.
The price of blockboard is directly proportional to the quality. Generally speaking, large core boards below the market price are usually unqualified. Especially brand products, those so-called "brand goods" that are too different from monopoly prices can basically be concluded to be fakes.
Aluminous gusset plate
Aluminum gusset plate is a kind of light and durable special material, which is widely used in ceiling decoration. It has many excellent characteristics and is suitable for kitchens and bathrooms. Not only can it achieve good decorative effect, but also it has many functions, so it is very popular among consumers. This is the origin of aluminum gusset ceiling.
The integrated ceiling integrates the four functions of heating, ventilation, lighting and gusset ceiling, that is, the heating, ventilation, lighting, sound effect installation and metal ceiling installation in the kitchen and bathroom are all completed by the manufacturer in one step.
Not all metal ceilings are environmentally friendly, but they have advantages and disadvantages. Inferior metal plates contain heavy metals, which have radiation to human body, are easy to rust due to high iron content, and poor quality of film mulching is easy to breed bacteria. Only some high-quality metal plates are environmentally friendly.
How to choose the aluminum gusset ceiling?
1. When purchasing aluminum gusset ceiling, we should look at aluminum, membrane and back cover, and check the quality of aluminum gusset from these three aspects. "The first thing is to check the material of aluminum. As it is difficult for ordinary consumers to see clearly the material of aluminum, consumers are advised to check the hardness of the pinch plate by themselves, and then check whether the paint surface is smooth, burr-free and chromatic.
2. Secondly, we should watch movies. Consumers can pull the edge of the buckle plate. If the film appears, it means that the film is not tightly attached to the pinch plate; Look at the back cover again (the back of the pinch plate), which is the part that many consumers ignore. Generally, the back cover should be treated with anti-corrosion and picked by hand. If the back cover can be taken off, it means that its material is not good; General regular manufacturers will spray the manufacturer's logo and production date on the back.
3. Finally, it is suggested to choose brand products. Brand products are relatively standardized and guaranteed in quality and service. The keel, hanger and fittings of light steel skeleton shall have product certificates. The cover plate shall have the factory certificate.
Engineering acceptance should have quality inspection and evaluation data.