(1) water supply and drainage. 
 (2) electrical pipeline project. 
 (3) The floor of the grass roots. 
 (4) sheeting grass-roots level. 
 (5) doors and windows Taoban the grassroots level. 
 (6) ceiling grass-roots. 
 Concealed work after the completion of required inspection, to ensure that leave no troubles, and qualified in order to follow-up of the construction work. Otherwise, discovered in the future, need to rework, not only affects the quality and delay duration, resulting in unnecessary economic losses. 
 Acceptance of the concealed works, you can proceed from the following: look, pull a drag to try to shake. See dragon skeleton, whether the formation of uniform, solid material, wire catheter with or without dead ends, the water supply pipe joints for leaks, drains unblocked; wall paste parts of the deal with clean see duplex, pull pull wire is connected firmly, pull freely ; try the water project eligibility, stagnant water for leakage; shook the door, the window cover plate is fixed firmly, floor grassroots whether to issue a "creak" sound. Concealed work points to note: 
 Wood keel: Avoid the use of low-grade wood, the specifications should meet the design requirements, and can not exist loosening, the need for the fire, the wood keel should brush 1-2 times, fire-resistant coating, and general use of light steel keel. 
 Ground water: in the construction process, destroyed the original ground, is likely to destroy the original waterproof layer. The ground water is also easily overlooked. Often use waterproof materials: polyurethane coating, the water did not leak, such as plugging Ling, a waterproof treatment, should be required water storage experiment, to see whether the water leakage within 24 hours. 
 Closed pipeline: Do not completely closed the pipeline within the room set aside for the place of inspection. 
 Ceiling: If the ceiling and floor and keel and veneer combination is not good, or load-bearing cause the roof to fall off or collapse. Accordance with the regulations, the ceiling keel may not distorted, deformed, installed the keel should be solid, reliable, four weeks the level of deviation does not exceed 5 mm, more than three kilograms of the ceiling or ceiling fans can hang on the ceiling keel, but should be a separate hook. If the ceiling gypsum board to do the veneer, its thickness to about 9 mm. 
 Terrace: closed loaded balcony, windows and doors must be smooth vertical and horizontal, the level consistent with the appearance of deformation on weld breakage the gap between the frame and the wall should be a full, dense. Pipeline leakage: the room heating pipes are prone to problems. The pipe installation is not easy to check, so all the end of the pipeline construction, to go through water injection, pressure check, did not run, run, drip, drain considered clearance. 
 Buried lines: Buried in line, the line can not be directly embedded in the plaster layer, while outside the wire casing. The casing of the wire can not be distorted, joints. In addition, the installation of the line, must strictly abide by the "front lines into the switch, the zero line into the lamp left zero right fire ground" provisions. After construction, in addition to be energized to check the construction team but also to the head of the household to provide a detailed circuit configuration diagram. 
 Basement clean-up before the paint is not the net, causing paint peeling off: before finishing the walls, to the original plaster eradicate clean, not to leave the oil spill. Wall putty and wall combination of dense, solid, can not afford leather, powder, not crack.