2.5 Coded, system of finishes in Room 1/18 compares favourably with over-elaborate annotation of finishes for Room 1/9 28

the rest of the room) is an ill-considered one. So while there is a case to be made for including in the set a plan coded (43) and dealing solely with floor finishes (which will serve as a base drawing for dealing with nominated suppliers), finishes pertaining to walls and their ancillaries for any room other than the most simply decorated are best dealt with by a series of internal elevation sheets covering the whole project on a room-by-room basis.

Figure 2.7 shows a workable format for this, and demonstrates its use in positioning accurately those miscellaneous items which if otherwise unco-ordinated are apt to make an unexpected and unwelcome visual impact during a site visit late in the contract.

This leaves ceiling finishes to complete the room, but before simply opting for a (45) coded reflected ceiling plan the implications must be considered of any suspended ceilings (which CI/SfB table 1 would have us code (35)) and of the lighting and air-conditioning layouts, both of which will normally have a bearing on the ceilings.

Let us be clear about what we are trying to achieve. There will be a location plan of air-conditioning trunking—no doubt prepared by the M & E engineer—and coded, if the stage has been reached of having other consultants working within a CI/SfB format, L (57). There will also be a lighting layout, sprinkler layout, etc and each will also be a location drawing of the appropriate code reference. Should a drawing be produced to consolidate these various services, to ensure that they can co-exist satisfactorily in the same underfloor void, then it would be an assembly drawing, and sensibly coded A(5-), since the services as a whole are its primary concern. But at the end of the day the architect's final drawing must be of the ceiling per se, so that the precise positioning of diffusers, lighting fittings, sprinkler heads, etc may be visually acceptable, and may be taken to represent the 'picture on the lid' for all concerned with the construction of it. This is in every sense a location drawing and a finishes drawing, and it will be coded L(45). It completes the sixth side of the cube for every room on that particular floor level.

Figures 2.8, 2.9, 2.10 and 2.11 show how the various disciplines concerned have dealt with their respective layouts for a particular area, and how the L(45) ceiling finishes drawing serves as the picture of the finished product, as well as providing a useful vehicle for information about applied finishes which it would have been difficult to provide in any other way.

This correlation becomes much easier with the use of CAD, where all the facets of information shown may be simply combined into one drawing file, as well as existing in their own right.

Roofs—particularly if they are flat roofs—are essentially just another floor, and it may be thought pedantic to introduce separate codes for them. Admittedly quantity surveyors and others concerned with elemental cost analysis require the distinction, but drawing codes do not always help here. Is 2.12 a roof plan of the factory, for instance, or is it a floor plan of the tank room?

On the whole it is preferable, in the interests of a coherent drawing package, to treat all horizontal divisions of the building as neither floors nor roofs but simply as 'levels', but to code them, when this becomes necessary, as floors.

This method has the inbuilt (and, on a large project, the very important) advantage that every plan level lies in a numerical sequence, and that in consequence (if care is taken) location plans of any one level, no matter what their elemental subject, will possess the same number.

The elementalised location plans of level 3, for example, could be numbered: L (2-) 003 L (3-) 003 L (42) 003 L (43) 003 L (45) 003 etc.

On a large project this is of immense practical importance to users of the drawing package because it offers them two ready sortations of the information. It is only necessary to assemble all the L (43) drawings, for example, to have the complete location information on floor finishes for the entire project. Assembly of all location drawings whose number is 003 on the other hand provides every elementalised location plan for level 3.

Some examples

It has already been noted that even the most complex of projects is unlikely to engage more than a handful of the available elemental sub-divisions. By the same token, it would be a very simple project indeed that did not benefit from some degree of elementalisation. The examples given here—taken from the drawing set whose basic location plan was shown in 2.4—cover some of the most fundamental sub-divisions, those dealing respectively with primary and secondary elements.

Location plans—Primary elements Note that CI/SfB table 1 offers the following choice within the general summary code (2-):

(21) Walls, external walls

(22) Internal walls, partitions

(23) Floors, galleries

(24) Stairs, ramps

(27) Roofs

(28) Building frames, other primary elements.

In the project illustrated (2.13) the decision was made to confine the architect's information about primary elements to a single, (2-) drawing. A similar decision was made at about the same time in relation to a smaller and simpler project. Since the reasons for arriving at this decision were different in each case, they serve to illustrate the importance of thinking about what you are trying to achieve before actually starting to draw.

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