North Carolina Building Contractor License Practice Exam

What must masonry not be supported on?

1. Concrete blocks

2. Wood girders

3. Steel beams

4. Metal scaffolding

The correct answer is: Wood girders

Masonry is a structural element that needs to be supported adequately to ensure its stability and safety. When considering its support options, the material on which masonry is placed plays a crucial role in its integrity and performance. In this case, wood girders are not ideal for supporting masonry due to a few key factors. Wood can absorb moisture and may swell or warp over time, leading to structural instability. Additionally, wood is prone to decay and insect damage, which can compromise the support it provides. Unlike more inert materials such as concrete or steel, wood does not offer the same level of durability and load-bearing capacity that masonry requires. For these reasons, employing wood girders as a support for masonry is not recommended, as it can lead to potential structural failures. The other materials listed, such as concrete blocks, steel beams, and even metal scaffolding, provide a much more stable and reliable foundation for masonry. They maintain their shape and strength better over time, ensuring that the masonry structure is secure.