| Value | Category | Cases | |
|---|---|---|---|
| 1 | Metal, aluminum, tin or zinc | 2 |
0.2%
|
| 2 | Tiles | 3 |
0.3%
|
| 3 | Shingles | 0 |
0%
|
| 4 | Thatch or grass | 0 |
0%
|
| 5 | Plastic sheets | 1 |
0.1%
|
| 6 | Asbestos | 1 |
0.1%
|
| 7 | Multiple materials | 10 |
0.8%
|
| 8 | Concrete | 1122 |
93.6%
|
| 9 | Some other material | 45 |
3.8%
|
| 10 | Could not tell / could not see | 15 |
1.3%
|