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| Idle time | Scheduled nonoperating time during which a machine is not working, ... | |
| Idle time | See machine time, scheduled nonoperating time. ... | |
| In-shift moving time | See machine time, scheduled operating time, delay time, nonmechanical delay ... | |
| Increment borer | Tool used to take a small core from the bole ... | |
| Independent | One who logs and sells his output on the open ... | |
| Industrial wood | All roundwood products except fuelwood. ... | |
| Injectors | Metering devices with a diesel engine that regulate the fuel ... | |
| Integrated logging | Logging operation that segregates and delivers a variety of products ... | |
| Intensive forest management | Utilization of a wide variety of silvicultural practices, such as ... | |
| Interim forest | Forest that exists or will exist until conversion to a ... | |
| Interlocking yarder - | Device that allows the main and haul-back drums to be ... | |
| Intermediate support | Spar tree or cable sling located between the head spar ... | |
| Intermediate support spar | Spar tree located between the head spar and tail spar ... | |
| Intermediate trees | Trees with small, crowded crowns below (but extending into) the ... | |
| International l/4-inch scale | Log scale modification of an earlier rule using a 1/8-inch ... | |
| International log rule | Formula rule that allows a 1/2 inch taper for each ... | |
| Intolerant | Tree relatively incapable of developing and growing normally in the ... | |