| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 3 |
0.2%
|
| 1 | Metal, aluminum, tin or zinc | 1305 |
81.6%
|
| 2 | Tiles | 41 |
2.6%
|
| 3 | Shingles | 3 |
0.2%
|
| 4 | Thatch or grass | 165 |
10.3%
|
| 5 | Plastic sheets | 9 |
0.6%
|
| 6 | Asbestos | 12 |
0.8%
|
| 7 | Multiple materials | 4 |
0.3%
|
| 8 | Concrete | 48 |
3%
|
| 9 | Some other material | 5 |
0.3%
|
| 10 | Could not tell / could not see | 4 |
0.3%
|