Carpentry for Vocational Schools - A Teachers Handbook
 23. STAIRS
 (introduction...) 23.1. Technical terms of a stair 23.2. Parts of a stair 23.3. Calculating the number and size of steps 23.4. Calculating the width of the stringers 23.5. Marking out stringers 23.6. Marking out top and bottom end of stringers 23.7. Joining and assembling stairs 23.8. Fixing stairs 23.9. External stairs 23.10. Concrete stairs

### 23.5. Marking out stringers

a) Gauging the "nosing line": - The nosing line is gauged 40 mm below the stringer-top with a combination square.

Figure

b) Gauging the "setting out line":

- On a steel square, you mark the depth of the going on the blade and the height of the rise on the tongue.

Figure

- The steel square is placed with the rise and the going position on the nosing line. Then measure the depth of the nosing in a right angle from the nosing line and mark it.

Figure

- Also the setting out line is gauged with a combination square along the stringer.

Figure

c) Marking out the "face-lines" of tread and riser: - A fence is now attached to the steel square. The riser height and the tread depth-marks on the square must be placed on the setting out line. The fence enables tread and riser lines to be repeated accurately. The face-lines of tread and riser are marked out by sliding the square along the stringer.

Figure

d) Marking out the thickness of tread and riser:

- This is done with templates made of plywood with the exact thickness and width of riser and tread.

- The tread-template is held below the face-line of the tread with the corner meeting the nosing line.

Figure

- The riser-template is held inside the face line of the riser meeting the bottom line of the tread.

Figure