BUILDING & TOWN PLANNINGGTU SUB CODE: 130603

6.0 WORKING DRAWING

To provide information to estimators/ contractors and other concerned persons

Draftsman should place himself in the place of these persons

Realize the importance of drawings with correct dimensions and clear notes

IS:962 – 1989 specifies the code of practice for architectural and building drawings

It lay downs recommendations for sizes and layouts of

drawings Methods of projections Sectioning and sectional

views Sizes of lettering Dimensioning Abbreviations Symbols used in bldg dwg

6.0 WORKING DRAWING

LINES: All lines in dwg have

significance Else they have no reason

for being on dwg Should be dense, clean

and black Visible outline : full line,

outstanding in appearance, (thickness varies with its purpose, 0.60, 0.80, 1.00 or 1.30mm)

Centre line : should project beyond

outline Alternate long and short

lines, closely and evenly Proportion: 6:1 to 4:1

Hidden line : Shows hidden/interior/

work to be removed Short dashes closely and

evenly spaced Used to show various lines

of roof such as ridge, loft, chajja etc

6.0 WORKING DRAWING

Break line: To show a break of continuity Short break : free hand line Long break : ruled line, free

hand zig-zag Section line :

thick long dash and two short dashes

Lettered at ends

DIMENSIONS : Nothing to do with scale Should represent actual size

of structure Dimension figure shall be

placed at center

Frame structure : column center dim

Load bearing structure : rough unfinished wall faces

Line up all dimensions to draw/write/read quickly

Units : ‘meter’ or ‘millimeter” If in meters, write ‘m’ If in millimeters, do not write

‘mm’ Give a note “all dimensions

are in mm”

6.0 WORKING DRAWING

Dimension line : Thin full line Placed outside the figure Placement shall be easy to

read Extension lines : Light or thin lines Drawn from extremities of

feature requiring dimension Should not touch feature Should start from a

distance of 2mm Extend to about 4mm

beyond dimension line

Arrow heads or Dots : Used to terminate dim line Length = 4 * depth Space should be filled If dots are used, they shall

be placed at intersection of extension and dim line

Leaders (pointer lines) : Used where it is not

possible to write note and dimension figure near feature

Lines drawn from notes to show where they are applied

Thin straight lines

6.0 WORKING DRAWING

LETTERING : All letters in capitals

except abbreviations Main title, dwg no :

6,8,10 and 12 mm Sub title, headings :

3,4,5 and 6 mm Notes, schedule,

materials dimensions : 2,3,4 and 5 mm