Presentation is loading. Please wait.

Presentation is loading. Please wait.

Calculating Stair Sizes Including string length Click mouse to bring each point or item in, to work through this example M. S. Martin Randwick TAFE Revised.

Similar presentations


Presentation on theme: "Calculating Stair Sizes Including string length Click mouse to bring each point or item in, to work through this example M. S. Martin Randwick TAFE Revised."— Presentation transcript:

1 Calculating Stair Sizes Including string length Click mouse to bring each point or item in, to work through this example M. S. Martin Randwick TAFE Revised Feb

2 Calc’s Exercise – Worked Example You may choose to write this down for reference as you work through next slide Specification: Calculate the quantity of timber required for the open riser stair with following spec: –Rise of flight850mm –Going of flight1.100m –String material250mm x 38mm sawn H/W –Treads45mm thick sawn H/W –Width of stair1.200m –Assume rise160mm

3 Answer – note: this symbol √ below means square root No. of Risers = =5.312 say 5 risers Height of riser =.850= 170mm 5 No. of Goings = 4 Width of going = =275mm Check 2R + G = 550 to 700 =(2 x 170) = 615 OK Length of string √ (rise of flight)² + (going of flight + one going of step)² √.850² + ( )² √.850² ² √ √ = Order 1.8m lengths String 250 x 38 H/W 3.6 Treads 275 x 45 H/W 4.8 (this size is simply to suit going requirement) You don’t have to show all the working, but for this example it shows you the full answer


Download ppt "Calculating Stair Sizes Including string length Click mouse to bring each point or item in, to work through this example M. S. Martin Randwick TAFE Revised."

Similar presentations


Ads by Google