| Value | Category |
|---|---|
| 1 | Masonry or concrete walls - concrete slab roof |
| 2 | Masonry or concrete walls - wood frame roof |
| 3 | Wood frame walls - masonry foundation |
| 4 | Wood frame walls - wood base or wood stilt foundation |
| 6 | Other type of construction |
| 9 | NIU (not in universe) |