Material Education
Natural Defects
Lumber Defects 101
Checks and Splits
Peck
Rot and Decay
Heart Pith
Ring Shake
Stains
Wormholes
Pitch, Gum, and Sap
Wane
Shelling
Knots
Material Education
Wood Deck Materials
Manufacturing Defects
Wet and Dry Wood
How to Read Grade Stamping
Plane Sawn and Quarter Sawn Cuts
Bark Side Up vs. Best Side Up
How to organize your materials for use
Warping
Crook or Crown
Bow
Cup
Twist



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Pitch, Gum, and Sap

 

These conditions are seen as a pocket of bleeding resinous material found on a board and occur when the tree is injured. It sometimes happens when a feeding insect damages the living part of the bark. Resin or sap can stain lumber and may cause difficulty when applying finishes.
 

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