Answer :
Final answer:
The specification implies a weight for rib lath but does not provide enough context to determine the exact unit of measurement. It is typically per square foot or square yard in construction. Conversion factors are necessary for precise interpretations of such specifications.
Explanation:
When specifications for a building state that rib lath should be 3.4 pounds, this measurement typically refers to the weight per square yard. Therefore, the correct option is "3.4 pounds per square yard." This standard measurement is used in the building industry for metal lath, including rib lath, and it's important for several reasons:
1. Consistency Across Types and Sizes: Using a standard measurement like per square yard allows for consistency and comparability across different types and sizes of lath. This standardization is crucial for builders and contractors to understand and follow the specifications accurately.
2. Indication of Durability: The weight of the lath is an important factor as it indicates the durability and strength of the material. A heavier lath typically means it can support a thicker layer of plaster and is suitable for more demanding applications.
3. Industry Standard: The construction industry commonly uses weight per square yard as the metric for metal lath. This practice ensures a universal understanding and application across various construction projects.
Correctly understanding and following this specification is essential for meeting the structural requirements and adhering to the design plans of a building project.