1. The defendant's appeal and the plaintiff's incidental appeal are all dismissed.

2. The costs after the filing of an appeal shall be individually counted.

1. The reasoning of the judgment of the court of first instance is as follows, with respect to the part of the appeal or incidental appeal asserted by the parties as the grounds of the judgment of the court of first instance: (a) the “appraisal 9” under the Table No. 4 of the judgment of the court of first instance shall be deemed to be the “Appraiser 1 (hereinafter “Appraiser 1”)”; and (b) the “relevant 12 or less” shall be deemed to be the “relevant 12 or less”; and (c) the same shall not apply in accordance with the main sentence of Article 420 of the Civil Procedure Act, unless the parties make an additional or supplementary decision as to the grounds of appeal or incidental appeal as follows.

2. Additional or supplementary judgment

A. The grounds for appeal and grounds for incidental appeal 1) The grounds for appeal (to the extent that it does not conflict with the interests of the defendant and the defendant's supplementary intervenor's assertion) A) the design of the apartment of this case related to the head of the agency, which were applied at the time of designing the apartment of this case, and Article 8 (1) 1 of the Fire Safety Standards (NFSC 103) for the head of the agency notified by the Minister of the Interior

B. The proviso provides that the pipes for pipes can be used for pipes without any emulsion, Dong and Dong gold (KS D 5301). Since the size and quality of the pipeline materials installed in the apartment of this case meet the Korean Industrial Standards (KS) and the thickness of the Dong pipe that can be used in the sprinkler pipe, it cannot be deemed that the first instance court appraiser violated the above standards because it used a sprinkler pipe with relatively less thickness, and the first instance court appraiser was designed as the material pipes of the damp sprinkler equipment permitted in the fire safety standards at the time of the design of the apartment of this case, and the chemical formation of the pipes (M-type, light quality) designed as fire pipes meet the Korean Industrial Standards, and thus the size and quality of the materials used in the apartment of this case meet the Korean Industrial Standards, it cannot be deemed that the design defect is a design defect.