Table 4.
Kerf widening rate according to species, timber type, size, and pretreatment condition

Specimens		Kerf widening rate (%)
		Cedar		Larch
		Square	Round	Square	Round
		9 cm	K	-30.7	-65.3	82.7	72.7
			KI	-100.0	-27.0	45.0	99.0
12 cm	K	125.3	24.0	-22.7	-100.0
	KI	102.0	-38.0	120.7	43.3
15 cm	K	-12.3	-16.0	32.0	193.0
	KI	8.7	142.3	114.7	97.7

K: kerfing, KI: a combination of incising and kerfing.