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Architectural Dimensioning Part 1

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1 Architectural Dimensioning Part 1

2 Floor-Plan Dimensions
Dimensioning system Aligned dimensioning--dimensions are placed in line with the dimension lines and are read from the bottom or right side of the drawing sheet Dimension lines are solid (Thin) and not broken Dimensions are placed above dimension lines approximately 1/16” above line

3 Example of Aligned Dimensioning
Note: Dimensions readable from the bottom of sheet and right side of sheet above the dimension line

4 Writing the Actual Dimension
Feet and Inch/fractions: ’-7 1/2” Even feet no inches: 4’- 0” Feet and zero inches/fractions: 8’- 0 3/4” No feet only inches: 10” No feet only inches/fractions: 5 1/2” Only fractions of an inch: /4”

5 General Rules to Follow for Placing Dimensions
Place exterior dimensions outside the floor plan, starting with the smallest first, then subtotals and finally overall totals Place interior dimensions inside the floor plan in string fashion. Several strings may be required both horizontally and vertically

6 Arrows or Terminators For class project use diagonal lines for all dimensioning terminators Use arrows for all leaders and callouts

7 Making Arrows for Leaders
Arrows for dimensions and leader lines should be the same Arrows usually have a set proportion and have a slender look to them 1/8” to 3/16” 1/32” to 1/16”

8 Making Tick Marks for Terminators
Commonly 1/8” long at 45 degree Usually done freehand A thick slash is common on manual and CADD drawings Freehand slash all in the same direction

9 Dimension Procedures 2) Brick or stone veneer over frame
Dimensions are placed on the drawing are dependant upon the type of material the walls are constructed of: 1) Frame or wood studs 2) Brick or stone veneer over frame 3) Solid masonry and cast concrete Discussion today include 1 and 2

10 Frame or Wood Studs Walls
Two x 4 or 2 x 6 make up the Skeleton of the structure A common wood frame wall is 5 1/4” thick This wall is drafted 6”

11 Frame or Wood Studs Walls
To communicate to the carpenter this exterior wall is dimensioned to the outside face of stud This dimension is /4” from the outside line of the wall

12 Frame or Wood Studs Walls
Materials terms that make up the wood frame wall: Siding (3/4”) Sheathing (1/2”) Stud (2x4) Gypsum Board (1/2”) Insulation in stud wall

13 Spacing of Dimensioning Lines
First string of dimensions are usually placed about 3/8” to 1” from the object depending upon the amount of space available Second string of dimensions are placed 3/8” to 1/2” from the first string of dimensions Additional strings of dimensions are spaced like the second string of dimensions

14 Dimensioning Exterior Frame or Wood Stud Walls
Dimension to the outside face of stud Dimension to centers of doors and windows Do not dimension interior partitions with the exterior string of dimensions

15 Steps in Dimensioning a Plan
Step #1--Place extension lines at face of exterior studs, center lines at centers of doors and windows Place first string of dimension lines about 3/4” away from floor plan

16 Steps in Dimensioning a Plan
Step #2--Place second string of dimensions about 1/2” from first string These dimensions are considered to be subtotals

17 Steps in Dimensioning a Plan
Step #3--Place overall dimension line about 1/2” away from previous dimension line Check that all cumulative dimension equal the subtotal dimensions Steps in Dimensioning a Plan

18 Brick or Stone Veneer over Frame
Same skeleton as framed structure but stone or brick replaces the siding with air space between brick and sheathing Dimensioned to face of stud

19 Brick or Stone Veneer over Frame
Dimension to the outside face of stud Dimension to centers of doors and windows Do not dimension interior partitions with the exterior string of dimensions

20 Dimension Exercise #1 Read Instructions & Follow all rules that apply:
#1--Dimension exterior horizontal dimensions #2--Dimension exterior vertical dimensions

21 Dimensioning Steps Tape drawing to drafting table and square with drafting machine. All work at this point will be with a 4H pencil (very thin): .3mm or .5mm with hard lead

22 Dimensioning Steps Place Extension lines at measuring points of the plan: 1)Face of stud of wood wall (1 ¼”) from outside wall line, 2)Face of stud of Veneer wall (5 ¼” from outside wall line, 3)Center of door and window Center Line Add Extension lines

23 Dimensioning Steps Place first line of dimension from plan (3/8” to 1”) 3/8” to 1” from plan

24 Dimensioning Steps Add sub total and total dimension lines. Note some plans will not require sub total dimension lines 3/8” to ½” ” from previous line

25 Dimensioning Steps Clean up extension lines and dimension lines and add any final dimension lines: (thickness of brick to face of stud, do only once and write (TYP) meaning TYPICAL Label at one location (TO FACE OF STUD) with leader pointing to it. To Face of Stud 5 ¼”(TYP)

26 Dimensioning Steps Add tick marks at all intersections of extension lines and dimension lines. Add guidelines above dimension lines and place values of measurements between tick marks Add Dimens For each string Add Tick Marks

27 Dimension Exercise #1 Solution

28 Lab Time First--Work on Dimensioning Exercise
Second—Work on Project Floor Plan

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