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orequal
Glossary

Performance specification

A spec that states the results a product must achieve rather than naming products.

A performance spec sets criteria, such as wind uplift rating, fire rating or thermal performance, and leaves product choice to the contractor, provided the product meets them. A descriptive spec is similar but describes physical properties instead of results.

Performance and descriptive specs are common in public work because they keep bidding open.

Why it matters to manufacturers

Any product that meets the criteria can win, so the sale moves to the contractor and the distributor. Knowing the criteria early lets you show compliance first.

Related terms

Proprietary specificationA spec that names a single product and allows no substitutes.Basis of designThe product a design was built around, named in the spec as the reference other products are measured against.SubmittalProduct data, shop drawings and samples the contractor sends for the architect’s review after award.

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