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Types of specification: general and detailed
Short answer
A specification states materials, workmanship, and measurement methods. General specification gives a brief outline for preliminary estimates, while detailed specification provides a complete item-wise description with materials, proportions, tests, and measurement, used in contracts and tendering.
Define specification and explain its types. Differentiate between general and detailed specification.
Specification
A specification is a document that states the quality, quantity, workmanship, methods, tests and measurement and payment of each item of construction work so that the contractor can price and execute it, and the engineer can check it.
Types
- General (brief) specification: a short statement of the nature, class and quality of the work and materials in the form of a general outline for a project.
- Detailed specification: a full description of each item of work: materials, proportions, workmanship, testing, curing, finishing, measurement and rates. It is used in the contract.
- Standard specification: published by an authority (DUDBC, Department of Roads, IS, BS) and used by reference.
- Special / particular specification: extra or modified conditions for a particular project.
- Performance specification: fixes the performance result required (strength, flow) and leaves the method to the contractor.
- Proprietary / brand specification: names a specific product or manufacturer.
- Method (prescriptive) specification: gives the exact materials and methods to be used.
General vs detailed specification
| Point | General specification | Detailed specification |
|---|---|---|
| Content | Brief outline of the work | Complete description of each item |
| Purpose | Give an idea of the standard; used for preliminary estimates, loans and approvals | Used in the contract, tendering and execution |
| Details | Little detail on materials and methods | Materials, proportions, workmanship, tests, curing, measurement |
| Use | Estimating at the early stage | Detailed estimate, rate analysis, supervision |
| Legal strength | Weak | Strong, used for dispute settlement |
| Example | "Brickwork in cement mortar 1:6 for superstructure" | Full clauses with brick class, mortar, laying, curing, payment |
✓ Answer checked by Claude Opus 5.5 (high effort)
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