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Types of drawings for building design
Contents
1 Location drawings and general arrangement drawings
1.1 Block plans
1.2 Site plans
1.3 Floor plans
1.3.1 Basic floor plan
1.3.2 General arrangement plans1.4 Elevations
1.5 Estate road layout
2 Assembly drawings
3 Component drawings
4 P rojections
4.1 Orthographic projection
4.2 Axonometric projection
4.3 Isometric projection
4.4 Oblique projection
5 Preliminary drawings
6 Sketch drawings
7 Working drawings
7.1 Specification
7.2 Bill of quantities
8 Find out more8.1 Related articles on Designing Buildings Wiki
Location drawings and general arrangement drawings
The information shown on a locating drawing will be overall sizes, levels and references to
assembly drawings. They are intended to show the location of the works, not detail (a common
mistake). The location drawings, which can be plans, elevation or sections, are numbered
consecutively with the prefix L.
Typically, location drawings will include:
Block plans.
Site plans.
Floor plans.
Foundations plans.
Roof plans.
Section through the entire building.
Elevations.
British Standard Specification 1192 includes recommended or preferred scales for location
drawings.
Block plans
Block plans usually show the siting of the project in relation to Ordnance Survey Maps.
Conventions are used to depict boundaries, roads and other details. Recommended scales are:
1 : 2500
1 : 1250
1 : 500
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Related articles
As-built drawings and record drawings.
Assembly drawing.
Bill of quantities.
Building information modelling.
Component drawing.
Computer aided design.
Detail drawing.
General arrangement drawing.
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Last edited 16 Nov 2015
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Site plans
Site plans usually show the extent of the site but no surrounding detail. Recommended scales
are:
1 : 500
1 : 200
The function of the site plan is to show:
The location of the building or buildings in relation to their surroundings.
The topography of the site, with both existing and finished levels.Buildings to be demolished or removed.
The extent of earthworks, included, cutting and filling, and the provision of bank and retaining
walls.
Roads, footpaths, hardstandings and paved areas.
Planting.
The layout of external service runs, including drainage, water, gas, electricity, telephone, etc.
The layout of external lighting.
Fencing, walls and gates.
The location of miscellaneous external components bollards, litter bins, etc.
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Floor plans
Floor plans usually show the layout of rooms, key dimensions and levels, and may also use
conventions and symbols to show materials and locations of fittings and appliances.
Recommended scales are:
1 : 200
1 : 100
1 : 50
Line types are used to differentiate information in floor plans. Hatching or conventions are used
to illustrate materials, while symbols are used to show fittings and appliances, often with
standard abbreviations.
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There are three situations that must be considered:
General arrangement (location) drawings designed to show a single building element and
what it should contain.
General arrangement drawings designed to be complete in themselves (clearly this type of
drawing would only arise on the smallest and simplest of projects.)
Basic floor plan drawings the drawings which provide the fundamental and minimal
information which will appear as the framework for each individual elemental plan. The basic
drawing, in fact, from which future drawing containing elemental information will be taken.
Basic floor plan
If a set of working drawings for a project is prepared, the floor plans may be divided into five
elements in the following manner:
(2-) Primary elements
(3-) Secondary elements
(5-) Services (piped and ducted)
(6-) Services (electrical)
(7-) Fittings
General arrangement plans
Where the elemental plans are to be drawn by CAD or manually, you must fist consider what
common features of the plans will need to appear in all five elementalised plans given in the
example above. It is clearly important that the information carried by the base negative, (manual)
or layers common to all drawings in a CAD set shall be, not too little, and not too much. Below is
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a check list of what the basic plan should contain and a list of those items which more often than
not get added to the original needlessly and superfluously to the subsequent inconvenience of
everyone.
To be included:
Walls
Main openings in walls (i.e. doors and windows)
Partitions
Main openings in partitions (doors)
Door swingRoom names and numbers
Grid references (when applicable)
Stairs (in outline)
Fixed furniture (including loose furniture where its disposition in a room is predetermined -
e.g. desks set out on a modular gird, etc.)
Sanitary fittings
Cupboards
North point
Items which tend to be included, but should not be:
Dimensions
Annotations
Details of construction e.g. cavity wall construction
Hatching and shadingLoose furniture where its disposition is not predetermined
Section i ndications
A uniform line t hickness should be used throughout and the middle of the t hree line thick ness
for the scale to be used on the plan is recommended.
Recommended pen size/line sizes are as follows:
Drawings to a scale of 1 : 50 and less (a) (b) (c)
Drawings to a scale 1 : 20 to 1 : 5 (a) (b) (c)
Drawings to a scale larger than 1 : 5 (a) (b) (c)
Pen size Range 1 0.2 0.3 0.4 0.5 0.7
P en S iz e Range 2 (I SO 9175-1)* 0. 18 0. 25 0. 35 0. 5 0. 7
* Pens size range follows the same size-ratio principle used for the international A-series paper
size (ISO216). The standard sizes (ISO 9175-1) differ by a factor 2. These pens are: 2.00 mm,
1.40 mm, 1.00 mm, 0.70 mm, 0.50 mm, 0.35 mm, 0.25 mm, 0.18 mm and 0.13 mm. So after
drawing with a 0.35 mm pen on A3 paper and reducing it to A4, you can continue with the 0.25
mm pen. (ISO 9175-1). Other sizes of pens are available, however, to keep the same factor
when working between different size sheets, the standard sizes of pens should be used.
Elevations
Elevations usually show the outline of the building, opening details and sizes, level datums and
floor position. An elevation should give an impression of how one face of the building will look
from the outside.
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Estate road layout
Should be at either 1:1250 or 1:500 scales. Line types will fulfil an important role in this type of
location drawing. The identity of buried items will be indicated by different line types.
Conventions and symbols will indicate hard and soft landscape details and street furniture should
be indicated by symbols.
Assembly drawings
The purpose of assembly drawings is to show how the building is erected on site. Information willinclude component identification and reference, assembly dimensions and tolerances with
reference to component drawings.
The assembly drawings can be:
Plans
Elevations
Section
The assembly drawing number is prefixed by the letter A. Standard details need an efficient
library coding system to aid retrieval and sorting, and the Common Arrangement of Work Section
(CAWS) reference system found in the standard old Method of Measurement (SMM7 - now
replaced by the NMR2 and Uniclass). Some assembly drawings will show:
Substructure section
External wall details
Wall openings such as head, sill and jamb sections, plans
Eaves details
Internal walls
Stair details
The structuring of drawn information into specific sheets helps the search patterns of the end
user. Some unenlightened designers will fill the drawing sheet with a mixture of plans, elevations
and, if there is room, detailed sections. The titled chosen for the drawing sheet is the first
indication of the content of the sheet. Search procedures by the end users follow a pattern and
the drawings should be structured and titled to maximise this procedure. Recommended scales
fore assembly drawings are: 1:50 1:20 1:10.
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The drawings will comprise plan view and sections, and the thickness of lines will depend on the
information hierarchy. Outlines and different components drawn with thicker lines alert the user tokey information as the eye scans the entire drawing. The placing of the section on the drawing
sheet should be carefully laid out to minimise search time for the end user.
Identification of materials using standard conventions will complement the annotation and
convey the extent of the materials used in the assembly detail.
The amount of text and dimensions included on the sheet should be just enough to achieve the
purpose of the drawing. For example, a drawing of a substructure detail should not include text or
specification relating to the roof. When placing text and dimensions onto the sheet, it is best to
assist the end user by leaving the drawing area uncluttered. The focal point is the drawn detail.
Once the diagram has been assimilated, further information is sought, with the eye radiating out
form the focus diagram. The diagram should therefore be encircled with dimensions and text, and
the text should be legible, concise and accurate.
Code references direct the user to further drawn information such as component drawings or to
the bill of quantities. The specification or the measured section of the bill of quantities should
explain the quality of the material or workmanship. This will avoid expensive duplication of
specifications on the drawings, reducing the possibility of discrepancies between tender and
contract documents.
Component drawings
This type of drawing shows individual components in the unfixed state. Information will include
component sizes, tolerance and specification with reference to the bill of quantity.
The component drawing number is prefixed by the letter C, and typical component details are:
Wood window head detail
Special door construction
Sill
Coping stone
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Component drawings are often large-scale, sometime full-sized drawings showing individual
components. Assembly drawings will contain several components, showing how the individual
components fit together to make a building element.
Recommended scales are:
1 :10
1 : 5
1 : 2
1 : 1
The component drawings will contain dimensions and some text, but the material specification
and the minimum acceptable quality will be defined in the specification section of the bill of
quantities. The CAWS reference code will direct the end user to the correct part of the bill of
quantities.
Projections
Orthographic projection
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Orthographic projection is a way of illustrating three-dimensional objects in a two-dimensional
drawing. The basic drawing layouts are shown below.
Drawing projections must comply with the relevant British Standard to prevent misunderstanding
and avoid errors in interpreting the drawing. The orthographic projection commonly used in Britain
is called the first angle projection, but there are other less common projections that can be used
to illustrate a three-dimensional object.
Axonometric projection
The advantage of an axonometric projection is the true plan set at 45 degrees. It is suitable for
interior and kitchen layout. Planning drawings are effective as axonometric projection to show the
relationship of existing buildings, topography and the proposed building.
Isometric projection
Unlike the axonometric projection, the isometric plan view is slightly distorted and can be used to
show the nature of the design more clearly than an orthographic projection. It is sometimes used
during the conceptualisation of the design to help the client grasp the mass of the proposal.
Oblique projection
When primary information is drawn in elevation, the interpretation can be enhanced by an oblique
projection.
Preliminary drawings
These drawings are often refereed to as thinking drawings, and illustrate elements of the design.
The freehand sketches are broad strokes with little detail and illustrate mass, proportion or other
aesthetic principles. Soft pencil or a fineliner pen on detail paper is the preferred medium. To
avoid deception the detail paper is often grid paper to ensure a correct proportion of images. The
focal point of the building can be quickly illustrated by a preliminary sketch. Simplicity and
avoidance of detail are the main aspects of a good preliminary drawing.
Sketch drawings
The entire range of drawings can be illustrated as sketch drawings. A location drawing can be
key or control drawing, showing control dimensions or levels. A sketched assembly drawing can
be used by the architect to instruct the technician preparing the ink negative. To avoid
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misinterpretation of size, it is advantageous to use a modular, grid ruled plan, in which the main
grid is 300 mm, with a secondary grid of 100 mm.
Working drawings
These are the final drawn instructions which the builder will use on site to convert the design
ideas into a real building, and care must be taken to ensure accuracy of dimensions and
specification. In preparing the location plan it is best to use a control box when hand drawing a
working drawing that is, maximum design length and width are drawn on the tracing film. All
details should fit within this control box, and if you find you are drawing outside the control boxyou should stop immediately as this indicates an error in the detailed measurements. Once the
drawing has been completed in ink, clean up the drawing and erase the control box.
When a drawing is being produced, thought must be given to the structuring of information. A
drawing contains certain information that must be observed. This is primary information, shown
by thicker lines and/or high intensity. Secondary information will be shown by lines of medium
thickness, while tertiary information will be indicated by thin lines. With ink drawings on film or
tracing paper, different pen thickness will achieve the necessary information hierarchy.
Specification
All drawings require annotation describing t he elements or identifying the c omponents. As these
descriptive notes and words must be clearly understood, it is essential to aim for legibility if they
are hand written, which means taking time to:
Form and shape each individual letter.
Space letters and words correctly.
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Arrange the text to help the end user.
Arrange the text in hierarchical c ontext.
To help achieve clarity of specification, stencils and dry letter transfers are available. When
using CAD, take the time to select a clear and suitable font. Fonts like Comic Sans should never
be used on any formal documents, signage, publications or drawings.
Bill of quantities
The bill of quantities which is, first, a vital tender document, then a contract document should
be an accurate description and quantification of the project. There should therefore be a cross-
reference to the tender drawing and architects notes or specifications.
Based on the old SMM7, some of the main cross-references are:
Concrete work:
1. - Concrete foundation E10.1
2. - Concrete bed (floor) E10.4
3. - Concrete cavity f illing E30.8
Masonry
1. - Clay brickwork in wall F10.1
2. - Cavities F30.1.1
3. - Damp-proof course, vertical F30.2.1
4. - Damp-proof course, horizontal F30.2.3
Carcass timber
1. - Rafter G20.92
2. - Floor joist G20.6
3. - Floor boarding K20.2
4. - Trussed rafter G20.2
Finishing joinery
1. - Wood window L20.1
2. - Double glazing L40.2
3. - Wood door frame L20.7
4. - Wood door L20.1
5. - Architrave P20.1
Roofing
1. - Concrete roof tiles H60.1
Plastering1. - Plasterboard and skim M20.2
2. - Plaster to walls M20.1
3. - Floor screed M10.5
(This information and cross-referencing should have been applied to older architectural drawings.)
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