Most of the second-hand houses have been inhabited for three to five years or even more than ten years. Is there any problem in quality or whether it has been overhauled? It is a problem that must be clarified before renovation. Except for some invisible hidden projects, we must check and make judgments. In addition, some seemingly new parts should pay special attention. For example, the newly painted walls or roofs may be used to cover the cracks on the walls of the house or the water seepage in the ceiling. In the case of similar situations, the new homeowner must pay special attention. First, the circuit is not modified, the socket can also be increased. Second-hand houses generally have simple circuit distribution, aging wires, illegal wiring, etc., which can no longer meet the needs of modern households, so they must be completely rebuilt and re-routed during renovation. If the original line is found to be an aluminum wire, it must be replaced with a copper wire with a 2.5 square millimeter cross section. For a line with high power appliances such as air conditioners, a 4 mm square section line should be provided separately. And PVC insulated retaining wire must be used when embedding. In addition, the new national standards stipulate that the number of fixed outlets in residential buildings should not be less than 12, but there are still many second-hand houses whose original number of outlets does not meet this standard. If a large number of mobile sockets are used, when the current load When it is increased, the mobile socket will have abnormal high temperature due to poor contact, which may cause hidden dangers for electric shock and electrical fire accidents. Second, the aging water pipe should be replaced by the water storage test The original water pipelines of second-hand houses often have many unreasonable layouts. When installing at home, the original waterways must be thoroughly inspected to see if they are rusted or aged. If the original pipeline uses a galvanized pipe that has been eliminated, it must be replaced with a copper pipe, an aluminum-plastic composite pipe or a PP-R pipe during the renovation. Before the second-hand house is renovated, the toilet and kitchen should be tested for water storage and leak testing for 24 hours to 48 hours. Check the original waterproofing work. If there is no water leakage, it proves that the waterproofing treatment is done well; if there is water leakage The phenomenon must be re-waterproofed. After the waterproof treatment, wait until the ground is completely dry, then lay the tiles and carry out the overall decoration. Moreover, when the toilet is changed to sit in the toilet, the waterproof treatment of the position of the toilet drain must be done well. When designing and decorating the top of the toilet, it should be convenient to disassemble and facilitate the inspection and maintenance in the future. At the same time, it should be noted that no dead ends can be left after construction. Third, the old doors and windows should be removed and redone Door and window aging is also a prominent problem in second-hand housing, but if the material is sturdy and you like its style, generally it can be renewed as long as it is repainted, but if the following problems occur, you must remove the redo, the main The problem depends on whether the wooden doors and windows are peeled and deformed. If there is, it means that the characteristics of the wood itself have changed, so it must be replaced. In addition, the paint film on the surface of steel doors and windows is detached, and the main body is rusted or cracked. In addition to being unsafe, it is difficult to restore the original shape. In order not to affect the use effect, experts should also remove the redo. Fourth, concealed works are taken apart to strictly check and eliminate hidden dangers At present, a large part of the quality problems in home improvement are caused by improper construction of “concealed worksâ€. What is “concealed projectâ€? In the process of construction process, the work of the previous process is over, and the part that will be covered by the next one and cannot be inspected is called “concealed projectâ€. Therefore, when the second-hand house is renovated, pay special attention to the “concealed projectâ€. For example, whether the pipes, lines, and equipment of various facilities such as water supply, air conditioning, and ventilation in the ceiling have been sealed and tested for electrical insulation and resistance, whether the connection is firm, whether the joints meet the requirements, and whether the flammable materials have been fire resistant. Combustion treatment, etc. are all within the scope of “concealed works†and cannot be inspected after the first installation. Insiders suggest that when renovating old houses, reopening these parts is a good opportunity to eliminate hidden dangers. Owners must strictly check and remove the “hidden works†left over from the past. 5. Also pay attention to three points when dismantling the decoration. 1. When smashing wall tiles and floor tiles, avoid debris blocking the sewer. 2, handle the waterproof, water pipe as little as possible to use elbows, to avoid poor water flow or blockage. 3, try to use less wood, most wood products contain formaldehyde, affecting health, and the wood will be wet and deformed due to the weather, and the labor costs of wood products are also higher. Sixth, the wall surface ceiling three sides can not be less During the renovation, the renovation of the wall, floor and ceiling of the second-hand house is also very important. Experts suggest that it is best to ask the professional to conduct on-the-spot investigation of the house to see if there is any obvious crack, whether it is flat, whether it is falling off or sanding. If these conditions exist, repairs must be carried out, including the removal of wall oil, powdered wall paint, etc., and the repair of the base layer, cracks and holes with cement mortar. In addition, after repairing, a primer should be applied to cover it to make the base layer firm. Secondly, it can prevent the base layer from changing due to efflorescence and moisture, and then use a scaled emulsion paint to finish. Seven, second-hand housing decoration should also be environmentally-friendly and completely disinfected There is an important step in the decoration of second-hand housing, which is to thoroughly disinfect. It can be sprayed with 3% of Sushui, 1%-3% of bleached water or 3% of peracetic acid solution. After spraying, close the door and window for one hour. 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