Timber Growth Defects

Question 1

Two types of knots

Answer 1

Tight (tightly bound to the wood around) & Loose (Bark prevents the knot from tightly binding to the wood)

Question 2

Intergrown knot

Answer 2

Base of a living branch within a tree, surrounded by a halo of circular growth rings. Also known as a “tight” knot

Question 3

Encased knot

Answer 3

Formed when a tree grows around a dead branch, surrounded by a dark ring of bark, center is decayed. Also known as a “loose” knot

Question 4

Spike knot

Answer 4

Formed when a board is cut right through the length of a branch, may be tight at base (Intergrown portion) and loose at end (Encased portion)