1 / 3

Calculating Stair Sizes Including string length

This guide provides a detailed worked example for calculating the timber required for an open riser stair. Specifications include a rise of flight of 850mm, a going of 1.100m, and string material dimensions. The calculation steps explain how to determine the number of risers and goings, including width checks for safety. It includes calculations for string lengths, treads, and material orders. This example serves as a reference for anyone working with stair design and construction.

floyd
Télécharger la présentation

Calculating Stair Sizes Including string length

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Calculating Stair SizesIncluding string length Click mouse to bring each point or item in, to work through this example M . S. Martin Randwick TAFE Revised Feb - 2008

  2. Calc’s Exercise – Worked ExampleYou 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 flight 850mm • Going of flight 1.100m • String material 250mm x 38mm sawn H/W • Treads 45mm thick sawn H/W • Width of stair 1.200m • Assume rise 160mm

  3. Answer – note: this symbol √ below means square root • No. of Risers = .850 .160 = 5.312 say 5 risers • Height of riser = .850 = 170mm 5 • No. of Goings = 4 • Width of going = 1.100 4 = 275mm • Check 2R + G = 550 to 700 =(2 x 170) + 275 = 615 OK • Length of string √(rise of flight)² + (going of flight + one going of step)² √ .850² + (1.100 + .275)² √ .850² + 1.375² √ .723 + 1.891 √ 2.614 = 1.617 • Order 1.8m lengths • String 250 x 38 H/W 1 @ 3.6 • Treads 275 x 45 H/W 1 @ 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

More Related