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

### 23.6. Marking out top and bottom end of stringers

Stringers must be designed properly in order to give the stair a strong connection to the top and bottom floor.

a) Top-end of stringers:

- The last riser must be measured separately, because of the flooring boards covering it. Having marked the last riser, extend the back line to the top and the bottom of the stringer. The bottom of the stringer is cut out on that line up to the floor level. The corner where the line meets the top of the stringer is marked out horizontally. Mark it with a length of 100 mm and plumb it down vertically. Then cut out the nose so it can rest on the floor.

Figure

- The completed top-end of the stringer.

Figure

b) Bottom-end of stringer: - Make a plumb cut 40 mm in front of the nosing and square off the heel of the stringer to rest on floor.

Figure