particular room, because the changes you make will greatly affect other rooms below it. Errors are less likely to occur and revisions will be easier to handle when each space in the schedule is lettered individually. Remember, whenever possible, place all of the schedules on the same sheet as their respective drawings on the building.

WRITTEN SPECIFICATIONS

Because many aspects of construction cannot be shown graphically, even the best prepared construction drawings often inadequately show some portions of a project. For example, on a drawing can anyone show the quality of workmanship required for the installation of doors and windows, or who is responsible for supplying the materials? These are things that can be conveyed only by hand-lettered notes. The standard procedure is to supplement construction drawings with detailed written instructions. These written instructions, called specifications (or more commonly specs), define and limit materials and fabrication to the intent of the engineer or designer.

Usually, it is the design engineer's responsibility y to prepare

NAVFAC SPECIFICATIONS

The Naval Facilities Engineering Command (NAVFACENGCOM) prepares NAVFAC specifications and sets standards for all construction work performed under its jurisdiction. This includes work performed by the Seabees. The three types of NAVFAC specifications are covered in the following information.

NAVFACENGCOM Guide Specifications

NAVFACENGCOM guide specifications (NFGS) are the primary basis for preparing specifications for construction projects. These specifications define and establish the minimum criteria for construction, materials, and workmanship and must be used as guidance in the preparation of project specifications. Each of these guide specifications (of which there are more than 300) encompass a wide variety of different materials, construction methods, and circumstances. Therefore, they must be tailored to suit the work actually required by the specific project.

To better explain this, let's look at figure 2-11 which is a page taken from a NAVFACENGCOM guide specification. In this figure, you can see that there are two paragraphs numbered 3.2.1. This indicates that the spec writer must choose the paragraph that best suits the particular project for which he or she is writing the specification. The capital letters I and J in the right-hand margin next to those paragraphs refer to footnotes (contained elsewhere in the same guide specification) that the spec writer must follow when selecting the best paragraph. Additionally, you can see that some of the information in figure 2-11 indicates other choices that the spec writer must make. Guide specifications should be modified and edited to reflect the latest proven technology, materials, and methods.

EFD Regional Guide Specifications

Engineering Field Division (EFD) regional guide specifications are used in the same way as the NAVFACENGCOM guide specifications but only in areas under the jurisdiction of an EFD of the Naval Facilities Engineering Field Command. When the spec writer is given a choice between using an EFD regional guide specification or a NAVFACENGCOM guide specification with the same identification number, the writer must use the one with the most recent date. This is because there can only be one valid guide specification for a particular area at any one time.

Standard Specifications

Standard specifications are written for a small group of specialized structures that must have uniform construction to meet rigid operational requirements. NAVFAC standard specifications contain references to federal, military, other command and bureau, and association specifications. NAVFAC standard specifications are referenced or copied in project specifications and can be modified with the modification noted and referenced. An example of a standard specification with modification is shown below.

"The magazine shall be Arch, Type I, conforming to specifications S-M8E, except that all concrete shall be class F- 1."