8, , Table of Contents (Masterformat ), , Table of Contents ( Masterformat ). 9, , List of Drawings, , List of Drawing Sheets. CSI MasterFormat Edition: Division 15 Mechanical-Section Fire Protection Piping. CSI MasterFormat Edition: Division 21 Fire. MasterFormat™ to Sorted by current NMS () numbers. Page 1 of Note: Numbers in Bold are revised NMS titles. Existing Numbers and Titles.

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Mechanical insulation was formerly limited to a single section or category of sections within Division 15—Mechanical. In the edition of MasterFormat, Division 15—Mechanical has been discontinued.

Instead, in the new division numbering scheme, CSI reserved Division 15 for future building-construction subjects. This masterformzt of MasterFormat is the most recent in a succession of updates to the industry standard.

From its early inception, the document has undergone many changes. Init first became known as MasterFormat, and it set the standard of 16 divisions and a five-digit numbering scheme. In the, and editions, CSI located all mastefformat specifications in Division 15—Mechanical.

Within that division, CSI slotted mechanical insulation in a series of sections beginning with the number CSI further assigned numbers and titles subdividing mechanical insulation into separate sections for ducts, equipment, and pipes. This additional subdividing gave specification writers flexibility.

4specs Discussion Forum: Does CSI recognize Masterformat – 16 Divisions

For simple projects that included few services to be insulated and required few insulation products, one could specify all mechanical insulation in a single section, ? In complex projects with many services to be insulated—each with varying conditions and different requirements for insulation materials, thicknesses, and coverings—the specifier could separate mechanical insulation into —Duct Insulation, —Equipment Insulation, and —Pipe Insulation.

Subdividing in this fashion did not duplicate information, because the requirements were different for each section, and it helped contractors find particular information more quickly. Inmechanical insulation moved to a new location in Division 15—Mechanical: In this location, as in previous schemes, the subject was subdivided using numbers and titles.

In the update, this organizational scheme continues, but mechanical specifications are now split among several divisions. This requires the insulation subjects also to split among those divisions. The new scheme allows the subjects in each division to be further subdivided for complex projects. These sections in the MasterFormat Edition have the same titles and are numbered 21 07 00, 22 07 00, and 23 07 00, respectively.

This is an initial step. Future updates are planned to separate these sections more finitely within each division. This will be especially useful for complex projects that require several different materials and applications. Mechanical insulation is in its new home in the three new mechanical divisions 21, 22, and 23each of which has insulation placed in a consistent location 21 07 00—Fire-Suppression Systems Insulation, 22 07 00—Plumbing Insulation, and 23 07 00—HVAC Insulation.


Each division could have a single or multiple sections, depending on the complexity of the project requirements. This separation, while controversial, poses no threat to contractors bidding on mechanical insulation, and it does not present a condition of three identical specifications.

The requirements for the three facility services are substantially different, as are the contents of the specifications for each. It is much like the situation with building and roofing insulation, which have different locations in the MasterFormat numbering scheme for insulation products. The initiatives of the National Insulation Association NIA to enhance the importance of mechanical insulation and establish its rightful role as an engineered system have brought increased emphasis on and awareness of the content and organization of mechanical insulation specifications.

There is an increase in the variety of available insulation products. There are also varying environmental conditions in which insulation must be applied and can function, and different purposes for insulating ducts, equipment, and piping that require different materials and applications.

When insulation systems are carefully engineered, the results usually include different materials, varying thicknesses, and varying installation requirements for each building service, as well as for the same services installed in different environments. These developments have created a need to more carefully, accurately, and comprehensively specify construction-contract requirements relating to mechanical insulation.

2004/2010 MasterFormat Divisions Map

Keeping the construction-contract documents organized so that readers nasterformat retrieve specific information easily during bidding and construction phases has necessitated a review of how mechanical insulation specifications should be written and organized. Comprehensive mechanical insulation specifications must communicate construction-contract requirements for the set of whole project requirements. Insulation is rarely, if ever, indicated on drawings, except for the occasional detail of how to insulate a particular item like a fitting or valve.

So the 1995, as one part of the construction-contract documents, must describe what services to insulate, the materials to be used for each service which often varies with the service sizeand the thicknesses to be applied which also often varies with service size.

Mastfrformat, the specifications must include detailed descriptions of vapor barriers, protective coverings, arrangements with service-supporting devices, quality of workmanship required, and means of ensuring that the specified materials are being used and applied as prescribed. These are complex requirements and necessitate carefully written and organized specification sections.


The requirements within a specification section or series of sections must be organized so that end users can easily find the information that they need. This organization of the content will depend not on the contract sum, but on the complexity of masterofrmat project.

Complexity depends on the number of services to be insulated and the number of different materials required to fulfill the design requirements for the project. This document sets the standard location of subject matter within a specification section and divides a section into three standard parts: Part 1 includes administrative requirements that are unique to the subject of the section insulationwithout repeating requirements specified in Division 01—General Requirements.

Part 2 is the location to specify materials and products, without regard to how or where they are applied in the project. Part 3 is the location to specify installation requirements, services and equipment to be insulated, and varying thicknesses for differing service sizes, without duplicating the product descriptions specified in Part 2.


The most complex specification requirements are for piping systems because one must consider pipe material, service temperature, ambient temperature, moisture conditions, and protection from physical damage. Often, the specifications for pipe insulation must be written with the understanding that the contractor has various options for which materials to use.

A specifier for hydronic piping may give masferformat contractor the option to use plastic, copper, or steel pipe material. Each may require different insulation material and thickness.

CSI categories (MasterFormat 1995)

Often, the pipe material changes with pipe size. In addition, each service usually passes through different environments, including air-conditioned and non-air-conditioned spaces, areas where physical damage is probable, and spaces where damage is not likely.

These conditions add complexity to the specifications because they determine the insulation materials, requirements for vapor barriers, and whether or not protective coverings are required. Often, there is a mix of requirements because the same service resides in all of these conditions and at varying sizes.

These are all factors in the insulation system design problem. Once the insulation system is designed, the engineer must create a specification that ensures the solution is fulfilled. Dsi offers a master-guide specification with insulation product selection and specification-writing guidance.

Mechanical Insulation Specifications Update: Changes in Specification Numbering Scheme. King February 1, Follow Us On Twitter http: