Table 2-3. Classification of Species with Respect to Heartwood Permeability

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Table 2-2. Specific Gravity and Shrinkage Values from Green to Six and Twenty Percent Moisture Content for Selected Domestic Species

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Wood Protection

Figure 2-9 Heartwood Perneability of Douglas-Fir

TABLE 2-3

Classification of Species with Respect to Heartwood Permeability

Hardwoods

Softwoods

Group 1. Heartwood Easily Penetrated

Basswood

Bristlecone pine

Beech (white heartwood)

Pinon pine

Black gum

Ponderosa pine

Green ash, Pin cherry

River birch, Red oaks

Slippery elm, Sweet birch

Tupelo gum, White ash

Group 2. Heartwood Moderately Difficult to Penetrate

Black willow

Douglas-fir (Pacific-coast type)

Chestnut oak

Jack pine

Cottonwood

Loblolly pine

Largetooth aspen

Longleaf pine

Mockernut hickory

Norway pine

Silver maple

Shortleaf pine

Sugar maple

Western hemlock

Yellow birch

Group 3. Heartwood Difficult to Penetrate

Hackberry

Eastern hemlock

Rock elm

Engelmann spruce

Sycamore

Lowland white fir

Lodgepole pine, Noble fir

Sitka spruce, Western larch

White fir, White spruce

Group 4. Heartwood Very Difficult to Penetrate

Beech (red heartwood)

Alpine fir

Black locus

Corkbark fir

Chestnut

Douglas-fir (Intermountain type)

Redgum

Northern white cedar

White oaks (except

Tamarack

chestnut oak

Western redcedar

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