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close this bookCarpentry for Vocational Schools - A Teachers Handbook
close this folder23. STAIRS
View the document(introduction...)
View the document23.1. Technical terms of a stair
View the document23.2. Parts of a stair
View the document23.3. Calculating the number and size of steps
View the document23.4. Calculating the width of the stringers
View the document23.5. Marking out stringers
View the document23.6. Marking out top and bottom end of stringers
View the document23.7. Joining and assembling stairs
View the document23.8. Fixing stairs
View the document23.9. External stairs
View the document23.10. Concrete stairs

23.3. Calculating the number and size of steps

You are advised to make the calculation for the stairs on the building site or with a proper drawing in a scale of 1 : 10 or 1 : 20 in order to make sure the stairs will fit correctly.

The HEIGHT of the riser is calculated by dividing the floor to floor height into a suitable number of risers each being approximately 175 mm.

The GOING is calculated by dividing the total going into a suitable number of treads each going being approximately 250 mm.


Figure

Total Going = 3250 : 13 treads = 250 mm tread
Total Rise = 2450 : 14 risers = 175 mm riser

When more space for the going is available, the go can be made up to 300 mm.