Joists are primarily used by large construction companies and construction sites. During the construction process, each unit generates a large amount of short boards and wood pieces, which take up space and pose some fire safety risks. Generally, businesses dispose of this waste by paying for it as garbage. Some companies, however, organize personnel specifically to clean and sort these short pieces of wood or joists for reuse.

Third-party timber splicing companies enter construction sites on behalf of third parties, where they assess the actual timber situation and perform targeted splicing and organization. Through processes like manual sorting, mechanical combing, glue application, and splicing, various lengths of timber required for construction are produced. (On-site splicing) The lifespan and quality of the spliced timber are nearly equivalent to that of solid timber of the same material and color, thereby reducing the timber usage costs for construction companies. The timber splicing machines include: timber splicers (strip splicers), notching machines (comb notching machines), air pumps, single/dual-chamber dust collectors, and small grinding machines.