Which type of specification guarantees the use of exact products or materials?

• A. Performance specifications
• B. Prescriptive specifications
• C. Open specifications
• D. Budget specifications

Answer: (B)

Prescriptive specifications require using exact products or materials by name or model, along with specified installation methods. This guarantees that what ends up in the project matches precisely what the designer or client requested, providing a high level of control over appearance, performance, and compatibility. It limits substitutions to approved equivalents, ensuring consistency across all work. In contrast, performance specifications state the required outcome or performance but not the specific product; open specifications allow substitutions based on criteria; and budget specifications focus on cost targets rather than identity of materials. So when the goal is to ensure exact items are used, prescriptive specifications are the most reliable choice.