Massachusetts Unrestricted Construction Supervisor License Practice Test

In a two-story single-family dwelling, what is the maximum allowed spacing of lally columns in a basement supporting a 6x8 wood girder?

1. 6 ft. 4 in.

2. 4 ft. 5 in.

3. 6 ft.

4. 5 ft. 6 in.

The correct answer is: 4 ft. 5 in.

The correct choice reflects the maximum spacing allowed for lally columns when supporting a 6x8 wood girder in a basement of a two-story single-family dwelling. In general, the spacing of columns is critical because it directly affects the load distribution of the structure. The specific span for lally columns can depend on factors such as the load being supported, the dimensions of the girder, and local building codes which dictate structural integrity. For a 6x8 wood girder, the span must align with industry standards and code requirements. A spacing of 4 ft. 5 in. is appropriate, as it ensures that the girder is adequately supported while distributing the weight effectively. This maximum distance prevents excessive deflection or failure of the structural elements under load, promoting safety and stability in the construction process. Having closer column spacing also allows for more effective lateral stability, particularly in regions where additional factors, such as wind or seismic activity, might influence building performance. By adhering to this guideline, builders can ensure they are creating a safe and compliant structure.