| Value | Category |
|---|---|
| NIU (not in universe) | |
| 1 | Concrete |
| 2 | Brick, cement block or stone |
| 3 | Mortared adobe |
| 4 | Wood |
| 5 | Exterior brick w/ plate or other plate |
| 6 | Bricks placed on edge. Flat adobe, or cement brick |
| 7 | Stick-and-mud, clay, straw, waste materials, tin, cardboard |
| 8 | Other material |
| 9 | Unknown |
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