Limitations of Conventional Wood System

There are three major problems with use of all-wood conventional formwork systems.

1. Подпись: Copyright © Marcel Dekker, Inc. All rights reserved.High labor costs. The conventional formwork system is a labor-intensive system. Labor costs range from 30 to 40 percent of the total cost of concrete slabs.

2. High waste. Erecting and dismantling conventional form­work is conducted piece by piece. This causes breaking of edges and deformation of wood. It is estimated that 5 percent waste is generated from a single use of form­work.

3. Limited number of reuses. Number of reuses is the key to an economical formwork construction. Typically, conven­tional formwork is limited to five to six reuses. A limited number of reuses forces the contractor to use several sets
of formwork; this adds to the expense of formwork con­struction.

4. Higher quality of labor force and supervision. Conventional formwork systems work best with a high-quality labor force and adequate supervision. In areas with an un­skilled or semiskilled labor force and minimal supervi­sion, more sophisticated formwork systems are more ap­propriate.

5. Limited spans. Since dimension wood is low strength compared to that of aluminum and steel sections, it has limited use in applications where long spans are desired.