Final answer:
The gauge required for non-bearing wall studs is not listed in the options provided; typical gauges are 25 or 20, not 16, 18, or 20. The actual gauge needed can vary depending on local building codes and wall design specifics.
Step-by-step explanation:
The question refers to the construction of a non-load bearing wall which generally involves the use of metal studs. The gauge of metal studs used for non-load bearing walls is not among the options provided (16 gauge, 18 gauge, or 20 gauge), as the typical gauge would be 25 or 20 depending on the wall design and building codes.
However, for the purpose of explanation, it's important to understand that the gauge of studs is an expression of the thickness of the metal, with a smaller number indicating a thicker gauge. Therefore, 16 gauge is thicker than 18 gauge, which is in turn thicker than 20 gauge.
For residential construction, thicker gauge studs are not typically necessary for non-load bearing walls. The specific gauge required would be determined by the local building code which takes into account factors such as the height of the wall and whether it supports any additional loads beyond its own weight.
It is always important to consult the local building codes or a structural engineer when determining the appropriate materials for construction.