34 Pa. Code § 21.62
The following woods may not be more than 5.0% smaller than spruce in each cross section dimension:
| Oregon ash | Fraxinus oregona. |
| Pumpkin ash | Fraxinus profunda. |
| Port Orford cedar | Chamaecyparis lawsoniana. |
| Cucumber | Magnolia acuminata. |
| Douglas fir (Coast region) | Pseudotsuga taxifolia. |
| Soft elm | Ulmus americana, fulva. |
| West Coast hemlock | Tsuga heterophylla. |
| Western larch | Larix occidentalis. |
| Oregon maple | Acer Macrophyllum. |
| Norway pine | Pinus resinosa. |
| Southern pine | Pinus taeda, palustris, serotina, echinata, caribaea, rigida, and glabra. |
| Tamarack | Larix laricina. |
This section cited in 34 Pa. Code § 21.21 (relating to wood side rails); and 34 Pa. Code § 21.65 (relating to wood for ladder use).