Red alder | Alnus rubra, rhombifolia. |
Alaska cedar | Chamaecyparis nootkatensis. |
Red Cypress | Taxodium distichum. |
White cypress | Taxodium distichum. |
Yellow cypress | Taxodium distichum. |
Douglas fir (Rocky Mountain region) | Pseudotsuga taxifolia. |
Douglas fir (Inland Empire) | Pseudotsuga taxifolia. |
Noble fir | Abies nobilis. |
Silver fir | Abies amabilia. |
White fir | Abies concolor, grandis. |
Black gum | Myssa sylvatica. |
Red gum | Liquidambar styraciflua. |
Hackberry | Celtis occidentalis, laevigata. |
Holly | Ilex opaca. |
Magnolia | Magnolia grandiflora. |
Soft maple | Acer saccharinum. |
Idaho white pine | Pinus monticola. |
Yellow poplar | Liriodendron tulipifera. |
Redwood | Sequoia sempervirens. |
Eastern spruce | Picea glauca, rubra. |
Sitka Spruce | Picea sitchensis. |
Sycamore | Platanus occidentalis. |
Tupelo | Myssa aquatica. |
34 Pa. Code § 21.63
This section cited in 34 Pa. Code § 21.21 (relating to wood side rails); 34 Pa. Code § 21.32 (relating to side rails); 34 Pa. Code § 21.40 (relating to step ladders); and 34 Pa. Code § 21.65 (relating to wood for ladder use).