Graphical Construction Glossary >> Roofs and roofing. >> Roof Trusses >> king post truss

King post truss
Also known as a crown post. A roof truss mostly wooden with two principal rafters, a tie beam and a central vertical King post. The simplest of trusses. Mainly used with two angled struts.

king post truss in Singapore

King post trusses spanning about 20 - 25 feet. Note the wind braces from the truss to the ridge beam. Early 20Th. century. Part of the former convent, CHIJMES area in Singapore

a king post truss variation

A variation in the method of bracing a king post. This again say 25 feet span at Chatham Royal Dockyard, UK. Early 19Th century.

king post truss king post struts

The K-Post roof truss has historically been made out of timber in quite large sections and was fairly limited in it's span. It can still be seen today in nail plate trusses and lightweight small span steel trusses.

king post truss layout

In a traditionally framed wooden truss of this type, as an example say spanning 20ft the member sizes would be in inches:-

  • Tie beam - 4"X8"
  • Principal Rafter- 4"X5"
  • King Post - 4"X4"
  • Strut 4"X4"
  • Purlin 4"X7"
  • Common Rafter 2"X4"
  • Ridge Board 1 1/2"X9"

These sizes are of course generalisations as the pitch, strength grade of the timber all come into the equation.

If you didn't find exactly what you are looking for try this search tool that will search the site and the web.

"What can be added to the happiness of a man who is in health, out of debt, and has a clear conscience?
Adam Smith 1723-1790

"When we build, let us think that we build for ever."John Ruskin 1819-1900

coates hire
Hire Equipment
Furniture Fittings - Architectural Hardware - Electronic Locking Systems - Technical Hardware
BuilderBill sponsorship

BuilderBill Books

building maths
Building Maths

Stair Design
asbestos ebook
Asbestos Book

Calculator Pages.

Concrete yardage calculator

Reader's Questions.

Questions and answers.



Please Note! The information on this site is offered as a guide only!  When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area.  It could be out of date!  Regulations breed faster than rabbits!
You must check your own local conditions.
Copyright © Bill Bradley 2007-2012. All rights reserved.
Page copy protected against web site content infringement by Copyscape