Quiz on Common Lumber Defects and Their Remedies

What is a common cause of checks in lumber?

• Insect infestation

• Rapid drying

• Excessive moisture

• Improper storage

Which defect is characterized by an end-to-end curve along the face of the board?

• Cup

• Crook

• Twist

• Bow

What causes a knot in lumber?

• Branch

• Root

• Leaf

• Insect

Which defect is caused by molds during drying or storage?

• Gum

• Check

• Machine Burn

• Discolored Stain

What is the recommended remedy for a cupped board?

• Fill with epoxy

• Remove the affected area

• Apply a stain

• Use a jointer

Which defect is described as an edge-to-edge curve across the face of the board?

• Twist

• Cup

• Bow

• Crook

What is a common remedy for machine burn on lumber?

• Apply a stain

• Fill with epoxy

• Use a jointer or sander

• Cut into shorter pieces

Which defect is caused by improper drying and results in separations along the growth rings?

• Checks

• Splits

• Twist

• Gum

What is the defect where the board is flat but turns up from end to end like a boat?

• Crook

• Knot

• Bow

• Split

Which defect is described as an irregular warping where one corner is not aligned with the others?

• Cup

• Twist

• Bow

• Crook