Simple Blueprint Reading – JSS3 Basic Technology Lesson Note (First Term)

TOPIC: SIMPLE BLUE PRINT READING

Blueprint is the means of communication between the builders and building designer(architect). They are finished plans of what is to be produced or built,i.e. it is the complete drawings builders use at their building site to build. In the building industry, the blueprint is also called the working drawing. The blue print is prepared by the architect while the builder interprets it correctly. Blue print reading requires high-level knowledge of architectural and engineering drawings. It also requires the ability to understand measurements and to measure accurately. Any mistake could be too costly.

The following are to be interpreted by the builders.

1. The floor plan
2. The elevation 
3. The section 
4. The detailed drawings
5. The schedule 
6. The electrical plan

COMMON SYMBOLS USED AND THEIR INTERPRETATIONS.

S /N     SYMBOLS               MEANING

1 Earth or soil                                                                             

2 Strip foundation

3 Hardcore

4 Mass concrete floor slab

5 Stone work 

6 Brickwork

7 Block work

8 Timber

9 Bath

10 Water closet

11 Sink

12 Wash hand basing

13 Fluorescent tube

14 Socket outline

15 Switch

16 Electric meter

17 Window

18 Door

19 Filament bulb

EVALUATION

1. Define simple blue print.
2. Mention five sections that can be find in a blueprint reading
3. Provide symbols for the following: doors, switch, hard core, concretes, wash hand 

basing.

GENERAL EVALUATION

1. Define scale.
2. Define scale drawing.
3. Draw the top of your desk using scale rule.
4. Draw a line 80mm and an equivalent of it in cm indicating the dimensions in cm.
5. Produce the building plan of a bungalow on page 235 of NERDC BK3 On a drawing sheet.

READING ASSIGNMENT

READ “SIMPLE BLUEPRINT READING” AND SCALE DRAWING

REFERENCE MATERIALS:

1. EVANS, BASIC TECHNOLOGY FOR JSS, BOOK 3 pages 97-101.
2. NERDC, BASIC TECHNOLOGY FOR JSS, BOOK 3 pages 220-236.

WEEKEND ASSIGNMENT

1. ________  can be defined as the accurate representation of objects in a determined proportion A. Scale drawing B. Freehand sketches C. Technical drawing D. Isometric drawing.
2. In _____ scale drawing, the object is drawn to the same size with the actual size. e.g.   1:1 A. enlarged  B. reduced C. full D. proportioned.
3. In ______ scale drawing the  actual size of the object is reduced in proportion to the drawing .It is used when the object is too big , examples include 1:2   ,  1:5   ,1:10  , 1:50   ,1:100  A. enlarged  B. reduced C. full D. proportioned.
4. _involves the assembly and erection of building structures. A. Building construction 
5. Architectural C. Marine engineering D. Forecasting engineering.
6. The following are the professionals in building industry except____________(a) Architect (b)structural engineer (c) quantity surveyor (d) agricultural engineer

THEORY

1. What do you understand by the word blueprint?
2. Mention types of scale drawing and explain them.