| Value | Category | Cases | |
|---|---|---|---|
| 1 | Earth/Mud | 857 |
14.3%
|
| 2 | Wood | 27 |
0.5%
|
| 3 | Stone/Brick | 27 |
0.5%
|
| 4 | Fibre-glass | 6 |
0.1%
|
| 5 | Cement/Concrete | 5078 |
84.7%
|
| 6 | Other/specify | 3 |
0.1%
|