When specifying roof drain setups and insulation, which type of specification is used?

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The correct answer involves a combination specification, which integrates elements from both proprietary and performance specifications to provide a comprehensive approach. When specifying roof drain setups and insulation, a combination specification allows the contractor to select specific products or systems while also outlining the desired performance outcomes that those products or systems must achieve.

This type of specification is particularly useful in construction projects where certain materials may be preferred for their quality or brand, but the overall performance of the system is also critical. By using a combination specification, the designer can ensure that while a specific product may be recommended, there's also flexibility to meet the project's functional requirements.

Proprietary specifications focus solely on specific brands or products without allowing for alternatives, which might limit options for the contractor. Performance specifications outline the expected performance criteria without dictating the specific product, leaving it entirely up to the contractor to select materials. Descriptive specifications provide detailed descriptions of the materials and installation methods required but do not necessarily include performance criteria or allow for product substitution in the same way that a combination specification does.

This integrated approach helps achieve the best results by balancing the need for specific products with the flexibility for performance-based solutions, leading to effective roof drainage and insulation outcomes.

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