CLASSIFICATION OF TIMBER

As per Indian Standards (IS: 4021–1967), it is preferred that timber used for building construction purposes is of one of the following four types:

1. Hardwood like teakwood for permanent structures.
2. Softwood like deodar wood for permanent structures.
3. Hardwood like sal wood other than teakwood for permanent structures.
4. Softwood other than deodar wood used for any temporary structures.