| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1 | Metal, aluminum, tin or zinc | 1102 | 
                                                                 
                                    
                                    91.8%
                                 
                                                             | 
                                                        
                    
| 2 | Tiles | 33 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    
| 3 | Shingles | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 4 | Thatch or grass | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 5 | Plastic sheets | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    
| 6 | Asbestos | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 7 | Multiple materials | 18 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    
| 8 | Concrete | 14 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    
| 9 | Some other material | 23 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    
| 10 | Could not tell / could not see | 9 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             |