Ceiling materials are mainly mineral wool board, gypsum board, wood panels, PVC plastic fastening board, glass, metal and so on. 1, PVC plastic fastening board ① characteristics of PVC as a raw material, processed to become a pengkou type profiles, has a light weight, easy installation, waterproof and moisture-proof, moth-proof features, it is the surface of the pattern of the flower color changes are also very much, and pollution-resistant, good cleaning, sound insulation, good performance of heat insulation, especially the new process of adding flame-retardant materials so that it can be extinguished from the fire, the use of more safe. Especially the new technology added flame retardant materials, so that it can be extinguished from the fire, the use of more secure. It is low cost, good decorative effect, so in the home improvement ceiling materials occupy an important position, become a bathroom, kitchen, washroom, balcony and other dominant ceiling materials. ② quality identification purchase PVC ceiling profiles, be sure to ask the dealer for quality inspection reports and product testing certificate. Visual inspection of the appearance of the quality of the board should be flat and smooth, no cracks, no bumps, can be installed and removed freely, the surface of the raging no scratches; hand knocking board sound crisp. Check the test report, the product's performance indicators should be met: thermal contraction rate of less than 0.3%, oxygen index is greater than 35%, the softening temperature of degrees Celsius or more, the ignition point of 3000 degrees Celsius or more, the water absorption rate of less than 15%, moisture absorption rate of less than 4%. ③Installation should firstly pop up the elevation line on the wall, fix the pressure line at both ends of the wall, and use cement nail to fix firmly with the wall. Sheet according to the actual size of the ceiling cut, insert the sheet into the pressure strip, the slats of the mouth to the outside, after the installation of the right, fixed with nails, and then insert the second board ...... last board should be cut according to the actual size of the cut using a sharp knife, with a steel ruler pressed to the pop-up line cut, loaded with a little bending can be inserted into the last board in the mouth, and then the board can be inserted in the last board. After installation, both sides of the pressure strip sealing. ④Maintenance and replacement of PVC ceiling profiles, water resistance, scrub resistance is very strong. If the PVC ceiling profile is damaged, it is very convenient to update it, as long as one end of the pressure bar is removed, the board is extracted from the pressure bar one by one, the damaged board is replaced by a new board and reinstalled, and the pressure bar is pressed. Replacement should pay attention to the new board and the old board color needs to be the same, do not have color difference. 2, metal products ceiling metal products ceiling refers to a set of multi-functional, decorative in one of the ceiling metal decorative panels. Compared with the traditional ceiling materials, in addition to maintaining its characteristics, texture, decorative sense of better, can be divided into sound-absorbing boards and decorative boards (not open hole). Acoustic plate is based on acoustic principles, the use of a variety of different perforation rate of the metal plate to achieve the elimination of noise, but also according to the need for round holes, square holes, oblong holes, rectangular holes, triangular holes, the size of the combination of holes, such as different types of holes, most of the base plate is white or aluminum color. Another metal decorative plate, pay special attention to decorative, clean and smooth lines, beautiful shape, elegant color, bronze, gold, red and blue, milky white and other colors; specifications coincide with the width of the ordinary residential coincide with the whole, and marble, aluminum alloy doors and windows, and other materials connected to a seamless integration of elegance and magnificence, for the appropriate static living room environment to add flowers. Metal decorative plate material types are aluminum, copper, stainless steel, aluminum alloy, etc., choose copper, stainless steel material decorative plate grade is higher, the price is also high, the general room decoration, choose aluminum alloy decorative plate is more appropriate, in line with the general shopping psychology, that is, inexpensive. Specifications have rectangular, square, etc., rectangular plate of the largest specifications of 6000mm * 100mm * 0.5mm, the general width of the room is about 5m more than the larger room decoration, the choice of rectangular panels of the integrity of the strong; the decoration of the small room can be generally used 500mm * 500mm. Due to the poor insulation properties of the metal plate, in order to obtain a certain sound-absorbing, adiabatic function, in the choice of metal plate for ceiling decoration, you can use the internal addition of glass wool, rock wool and other thermal insulation products to achieve the adiabatic sound-absorbing function. Especially the residents living in the top floor, after decorating can improve the indoor environment, obviously save the energy consumption cost of air conditioning.3, gypsum board ceiling gypsum board is a new type of ceiling decoration material which is widely used at present, with good decorative effect and good sound absorption performance, the more commonly used ones are poured gypsum decorative board and paper decorative acoustic board. Pouring gypsum decorative board has the characteristics of light weight, moisture-proof, no deformation, fire prevention, flame retardant and so on. And there is convenient construction, good processing performance, can be sawed, can be nailed, can be planed, can be bonded and other advantages. The main varieties are: all kinds of flat boards, patterned relief boards, semi-perforated boards, fully perforated boards, waterproof boards and so on. Patterned relief board is suitable for living room, bedroom, study ceiling; waterproof board is mostly used in the kitchen, bathroom and other places with high humidity. Paper decorative sound-absorbing board has the characteristics of fireproof, sound insulation, heat insulation, good anti-vibration performance, easy construction and so on. Ceiling uneven causes and prevention 1, phenomenon: irregular waviness of the ceiling 2, cause analysis: ① arbitrary arching, the formation of uneven arch. ② ceiling perimeter grille or uneven corners. ③ water content of wood, resulting in shrinkage and deformation. ④ uneven keel joints with hard bends, resulting in uneven ceiling. ⑤ The spacing between the suspension rods or bars is too large, and irregular deflection occurs after the keel is deformed. (6) The combination of stress nodes is not strict, and the displacement and deformation will be produced after the stress. 3, preventive measures ① Ceiling timber should be selected from high-quality soft timber, such as pine, cedar, and its moisture content should be controlled within 12%. ② keel should be straight, should not be twisted and have a transverse section through the section of the scar.