Behind Construction Fence: What Should We Do To Practice Zero Building Defects?
Table 2: Factors affecting focusing on typical roofing defects
| Defects happened using unappropriate material | Defects happened using unappropriate technique | Defects happened due to inadequate workmanship | Defects happened mainly due to design problem | Lack of/poor maintenance | TOTAL DEFECTS | FIRST TIME DEFECTS | REPEATING DEFECTS | |
| ROOF DEFECTS | ||||||||
| RWDP size lacking | 0 | 9 | 11 | 14 | 9 | 43 | 23 | 20 |
| RWDP clogged | 0 | 23 | 9 | 19 | 12 | 63 | 40 | 23 |
| Concrete/Metal gutter clogged | 7 | 8 | 8 | 11 | 19 | 53 | 20 | 33 |
| Roof eaves short/design | 4 | 12 | 11 | 14 | 7 | 48 | 22 | 26 |
| Roof movement / Loading | 0 | 4 | 4 | 7 | 9 | 24 | 11 | 13 |
| Air-cond piping leaking | 0 | 12 | 23 | 13 | 23 | 71 | 40 | 31 |
| Flashing defects | 5 | 9 | 11 | 12 | 13 | 50 | 28 | 22 |
| CONCRETE FLAT ROOF | ||||||||
| Concrete flat roof crack | 12 | 17 | 9 | 8 | 14 | 60 | 38 | 22 |
| Water ponding / Drain problem | 7 | 8 | 14 | 7 | 12 | 48 | 22 | 26 |
| Sulphate attack | 5 | 7 | 8 | 0 | 3 | 23 | 16 | |
| Asphalt / poor joint | 19 | 16 | 23 | 21 | 32 | 111 | 69 | 42 |
| METAL ROOFING | ||||||||
| Roof stained leakage | 0 | 4 | 6 | 7 | 15 | 32 | 14 | 15 |
| Metal gutter leakage | 4 | 3 | 12 | 9 | 12 | 40 | 17 | 23 |
| Roof edge no sufficient / design | 0 | 5 | 12 | 3 | 9 | 29 | 11 | 18 |
| ROOF TILE – concrete / clay | ||||||||
| Tile crack | 0 | 12 | 15 | 16 | 9 | 52 | 31 | 21 |
| Tile misplace | 0 | 3 | 16 | 4 | 11 | 34 | 14 | 20 |
| ASBESTOS ROOF | ||||||||
| Crack | 12 | 8 | 8 | 9 | 9 | 46 | 21 | 25 |
| Holes found | 8 | 5 | 7 | 9 | 11 | 40 | 18 | 22 |
| Overlapping problem | 3 | 5 | 8 | 9 | 11 | 36 | 14 | 22 |
| TOTAL/MAIN | 86 | 170 | 215 | 192 | 240 | 903 | 472 | 424 |