Spalted Birch (Paper Birch or Yellow Birch)
Betula papyrifera / Betula alleghaniensis · Hardwood
- Type
- Hardwood
- Origin
- Boreal and temperate regions of Northern and Eastern North America
- Hardness
- 1,260 lbf (Hard - Yellow Birch) / 910 lbf (Medium - Paper Birch)
- Durability
- Non-durable to Slightly Durable; highly susceptible to rot, decay, and insect attack, especially when spalted (decayed)
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Grain Pattern
Straight to slightly irregular with distinct spalted zone lines and fungal streaking on the right section; fine, uniform texture with faint wavy figure visible on the left side
Color & Appearance
Creamy white to light reddish-brown heartwood/sapwood on the left, transitioning into pale yellowish-white wood with dark brown and black spalted lines and discoloration on the right
Hardness (Janka)
1,260 lbf (Hard - Yellow Birch) / 910 lbf (Medium - Paper Birch)
Durability & Decay Resistance
Non-durable to Slightly Durable; highly susceptible to rot, decay, and insect attack, especially when spalted (decayed)
Value & Sustainability
- Estimated Market Value
- $8.00 - $14.00 per board foot for high-figure/spalted visual grades
- Wood Age Estimate
- Freshly milled or recently harvested lumber from a mature tree (estimated tree age 40-80 years); minimal natural surface aging, rough-sawn top area visible
- Sustainability Status
- Least Concern (IUCN Red List), non-CITES listed, widely available from sustainable North American forestry operations
Common Uses
Turning stock, bowls, decorative boxes, specialty furniture, knife handles, veneers, artistic woodworking
Geographic Origin
Boreal and temperate regions of Northern and Eastern North America
Workability
Generally works well, but soft punked spots caused by spalting require sharp tools to prevent tearout; glues and turns exceptionally well; fine dust from spalted fungus requires proper respiratory protection
Finish Recommendations
Stabilizing oil finishes (Tung oil, Danish oil), clear shellac, or polyurethane; soft/punky areas benefit from deep-penetrating resin or thin CA glue stabilization before sanding
Notable Features
Distinctive black zone lines caused by fungal decay (spalting); fine, even texture; fine dust can cause respiratory irritation due to fungal spores
