California IDEX Practice Exam

A designer is specifying wood cornice molding, baseboards, chair rails, and door trim for several rooms in a Type I building. What is the maximum amount of trim that is allowed?

1. 5% of the aggregate wall or ceiling area in which it is located

2. 10% of the aggregate wall or ceiling area in which it is located

3. 15% of the aggregate wall or ceiling area in which it is located

4. 20% of the aggregate wall or ceiling area in which it is located

The correct answer is: 10% of the aggregate wall or ceiling area in which it is located

The correct answer reflects the maximum allowance for trim in a Type I building, which is guided by fire and building codes. Specifically, the limit of 10% of the aggregate wall or ceiling area that trim can occupy serves to ensure that while decorative elements can be used for aesthetic purposes, they do not significantly compromise the fire resistance and structural integrity mandated for such constructions. In the context of interiors for Type I buildings—characterized by their non-combustible materials and often used in high-rise structures—regulations are stringent to maintain safety. Limiting the trim to 10% of the aggregate area helps in controlling the combustible materials in the space, thereby limiting potential fire hazards while still allowing for functional and decorative finishes. This ensures that the design can still meet aesthetic goals without overwhelming the structural requirements and fire safety standards set forth for Type I construction. Thus, the choice of 10% strikes a balance between design flexibility and adherence to safety regulations.