In the process of home improvement, owners will pay great attention to the quality and environmental protection requirements of home improvement building materials, but they do not know much about the calculation of home improvement works. Experts said that the calculation method of engineering quantity is very particular. If there is a malicious deviation in the calculation of engineering quantity, it will bring a large deviation to the final account.

　　The area of ​​home improvement is strange

　　During the Golden Week, the owner Xiao Kong took advantage of the holiday to hurry up to decorate his new house, but when the decoration was on the ceiling, he found something strange. The businessman told him that since the hardwood grille ceiling of his house needs to be constructed inside and outside the grille, the area of ​​the ceiling needs to be multiplied by 2. In this way, the cost of Mr. Kong's ceiling has virtually doubled, which makes him Feeling very depressed.

　　Recently, a reporter from the Bohai Morning Post learned in an interview that gold nine and silver ten are the peak season for the home improvement market, but some owners found in their home improvement projects that the amount of work for household tiles, floor laying and ceiling ceilings was very different from the amount of work they measured. The actual area of ​​tiles and floors may differ by 20% from the laying area. In particular, the amount of work on the ceiling can be nearly doubled. For houses originally only 20 square meters, the amount of ceiling work can reach more than 30 square meters.

　　Ceiling technology determines engineering algorithm

　　At present, home improvement ceilings are divided into gypsum ceilings, metal grille ceilings, hardwood grille ceilings and other different processes. The process is different, and the calculation of the engineering volume of the ceiling is also different.

　　Ordinary ceiling surface decoration works should be calculated in square meters according to the net area of ​​the room, without deducting the area occupied by inspection openings, chimneys attached to the wall, stacks attached to the wall and pipes, broken lines, staggered platforms, arches, domes, heights in the ceiling The ceiling area of ​​other art forms such as light troughs is calculated in square meters according to the expanded area shown in the figure. Ceiling coatings, paints and pasting shall be calculated in square meters according to the corresponding engineering quantities of the veneer base. However, metal grille ceilings, hardwood grille ceilings, etc. are calculated in square meters according to the size of the ceiling and the horizontal projected area.

　　The glass lighting ceiling is measured in square meters according to the size of the glass ceiling surface and the expanded area. The sound-absorbing and insulating layer of the ceiling shall be calculated in square meters according to the size shown in the picture of the sound-absorbing and insulating ceiling. The caisson light strip is calculated in meters according to the design size of the outer edge of the light strip.

　　There is a standard for the loss of tile laying

　　The laying area of ​​floor tiles is another project that is prone to large discrepancies between the amount of engineering and the laying area. This is mainly because the merchants need to calculate the decoration loss when laying floor tiles. For example, for a cut floor, the area should be calculated according to the entire floor, not only the area on the ground. Therefore, the merchant is laying 40 square meters. When the ground is not enough, there may be 42 square meters of floor material cost and installation cost, and the extra 2 square meters of cost is the normal decoration loss. However, at present, some merchants maliciously increase the loss of decoration in order to make huge profits. Some large pieces of waste can be completely reused, but the installers choose to cut new materials, resulting in the loss of floor paving as high as 20% of the paving area.

　　In this regard, according to the GBT20238-2006 "Wooden Floor Paving, Acceptance and Use Specifications" issued by the state, if it is not a special room and special paving, the loss of floor paving should be less than 5% of the paving area. If consumers find that the loss exceeds 5%, they can challenge the merchant.