Performance Requirements on Remodeling Apartment Housing and TOPSIS Evaluation

Table 4

Summary of remodeling design solutions.

Items	The subject status for remodeling	Alternative method—CEM A	Alternative method—CEM B
Sectional view of the installed pipe
Features of the construction method	A sewage pipeline is installed on the ceiling of the household in downstairs	Repair of existing shaft space; piping the sewage pipeline in subject floor by constructing the additional 50 mm thick flooring	Shaft removal; sewage pipeline buried in a noise-proof wall
Major limitations of the technique	Difficulty in maintenance and issue of noise occurrence	Easy maintenance and relatively less noise	Easy maintenance, perfect noise blocking, and increase of useful workspace due to reduction in shaft space