| Value | Category | Cases | |
|---|---|---|---|
| 1 | Metal, aluminum, tin or zinc | 386 | 
                                                                 
                                    
                                    32.2%
                                 
                                                             | 
                                                        
                    
| 2 | Tiles | 63 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    
| 3 | Shingles | 7 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 4 | Thatch or grass | 208 | 
                                                                 
                                    
                                    17.3%
                                 
                                                             | 
                                                        
                    
| 5 | Plastic sheets | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    
| 6 | Asbestos | 145 | 
                                                                 
                                    
                                    12.1%
                                 
                                                             | 
                                                        
                    
| 7 | Multiple materials | 15 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| 8 | Concrete | 344 | 
                                                                 
                                    
                                    28.7%
                                 
                                                             | 
                                                        
                    
| 9 | Some other material | 23 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    
| 10 | Could not tell / could not see | 5 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             |