1. Materials
1.1. Manufacturer defects
1.2. Sub standard materials
1.2.1. Low Quality Material
1.3. Chemical Reaction
1.3.1. Discoloration
1.3.2. Corrosion
1.3.3. Stain
1.4. Wrong Selection of Material
1.5. Faulty Material
2. Human
2.1. Faulty design
2.1.1. Poor details design
2.1.2. Poor specification
2.2. Faulty construction
2.2.1. Corrosion
2.2.2. Cracking
2.2.3. Cold Joint
2.2.4. Honey Combing
2.2.5. Structure Collapse
2.3. Poor Workmanship
2.3.1. Incompetency
2.4. Vandalism
2.4.1. Bad attitude/behavior
2.4.2. Lack of Security
2.4.3. Damage to equipment
2.4.4. Damage to building
2.5. Faulty System
2.5.1. inadequate testing of system
2.5.2. Failure to follow the instruction
2.5.3. Inability to operate the system
3. Environment
3.1. Atmospheric
3.1.1. Weather
3.1.1.1. Wind Effect
3.1.1.1.1. Damage at the building roof
3.1.1.1.2. Downdraught Effect
3.1.1.2. UV from Sun
3.1.1.2.1. Heat
3.1.1.3. Humidity of air
3.1.1.3.1. Moisturizing Effect
3.1.2. Air Pollution
3.1.2.1. Health Problem
3.1.2.2. Ozone
3.1.2.3. Chemical Reaction
3.2. Moisture
3.2.1. Fungus
3.2.2. Harmful growth
3.2.3. Rust staining
3.2.4. Peeling off of Paint
3.2.5. Poor Indoor Air Quality