The following woods may not be more than 10% smaller than spruce in each cross section dimension
White ash | Fraxinus americana, biltmoreana, pennsylvanica lanceolata, pennsylvanica, quadrangulata. |
Beech | Fagus grandifolia. |
Birch | Betula lenta, lutea, nigra. |
Douglas fir (dense) | Pseudotsuga taxifolia. |
Rock elm | Ulmus racemosa. |
Hickory | Hicoria ovata, laciniosa, alba, glabra, ovalisi. |
Ironwood | Ostrya virginiana. |
Black locust | Robinia pseudacacia. |
Honey locust | Gleditsia triacanthos. |
Hard maple | Acer nigrum, saccharum. |
Red maple | Acer rubrum. |
Red oak | Quercus borealis maxima, borealis, velutina, shumardii texana, palustris, phellos, laurifolia, rubra, rubra pagodaefolia, nigra, ellipsoidalis, coccinea, marilandica, kelloggii, catesbaei. |
White oak | Quercus alba, stellata, lyrata, bicolor, muehlenbergii, garryana, prinus, montana, macrocarpa, lobata, virginiana, douglasii, utahensis, emoryi, arizonica, oblongifolia. |
Osage orange | Toxylon pomiferum. |
Pecan | Hicoria pecan, cordiformis, cordiformis elongata, myristicaeformis, aquatica. |
Persimmon | Diospyros virginiana. |
Southern pine (dense) | Pinus taeda, palustris, serotina, echinata caribaea, rigida, glabra. |
34 Pa. Code § 21.61
This section cited in 34 Pa. Code § 21.21 (relating to wood side rails); 34 Pa. Code § 21.23 (relating to wood steps); 34 Pa. Code § 21.31 (relating to general); and 34 Pa. Code § 21.65 (relating to wood for ladder use).