1 the fine, soft, shiny fiber produced by silkworms to form their cocoons. 2  thread or fabric made from this fiber. 3  a garment or other article made of this fabric. 4  a distinctive silk uniform, as of a jockey.  the silk gown worn by a King's (or Queen's) Counsel in British law courts.
A prescriptive specification is one that includes clauses for means and methods of construction and composition of the concrete mix rather than defining performance requirements.he general concept of how a performance-based specification for concrete would work is as follows: There would be a qualification/certification system that establishes the requirements for a quality control management system, qualification of personnel and requirements for concrete production facilities.
Typical Code Structure. A prescriptive code requires that each component is built to a certain standard, e.g. Wall R-value at least 20. A performance code requires that the building as a whole performs to a certain standard, e.g. uses less energy than the same building built to prescriptive code.rovided the mandatory requirements are met, the rest of the code can be met in one of two ways. The project team can follow prescriptive requirements, building each component to a certain level of performance (some of the 2012 IECC prescriptive requirements are shown below).