previous
  • 7 Trim Carpentry Secrets
    7 Trim Carpentry Secrets
  • Deck Design & Construction
    Deck Design & Construction
  • Electrical Articles & Videos
    Electrical Articles & Videos
  • Video: Build a curved step
    Video: Build a curved step
  • The Hobbit House and More
    The Hobbit House and More
  • Master Carpenter Videos
    Master Carpenter Videos
  • Remodeling in Action
    Remodeling in Action
  • Read FHB on Your iPad
    Read FHB on Your iPad
  • Tips & Techniques for Painting
    Tips & Techniques for Painting
  • How to Install Housewrap Solo
    How to Install Housewrap Solo
  • 7 Smart Kitchen Solutions
    7 Smart Kitchen Solutions
  • 9 Concrete Countertops Ideas
    9 Concrete Countertops Ideas
  • Buyer's Guide to Insulation
    Buyer's Guide to Insulation
  • Basement Remodeling Tips
    Basement Remodeling Tips
  • Energy-Smart Details
    Energy-Smart Details
  • 12 Remodeling Secrets
    12 Remodeling Secrets
  • The Passive House Build
    The Passive House Build
  • Magazine Departments
    Magazine Departments
  • Clever daily tip in your inbox
    Clever daily tip in your inbox
  • Shorten a Prehung Door
    Shorten a Prehung Door
  • All about Roofing
    All about Roofing
  • Play the Inspector Game!
    Play the Inspector Game!
  • 7 Small Bathroom Layouts
    7 Small Bathroom Layouts
next
Pin It

How it Works: Roof Trusses

The roofs on most new houses in the United States are built with trusses. In this "How It Works" column, structural engineer Rob Munach explains how trusses carry their loads and how T-bracing and roof sheathing add strength. He identifies the different parts of a truss--top chord, bottom chord, web, and nail plates--and how each functions. An illustration shows the compression and tension ratings of a truss that has been modeled with a combined dead, live, and snow load of 40 lb. per sq. ft. Munach stresses that because trusses are built with no redundancy, cutting them can have consequences ranging from damage to interior finishes and materials to catastrophic roof failure. Another illustration shows how cutting the web of a truss increases the deflection potential of the bottom chord.

From Fine Homebuilding225 , pp. 18-19 January 19, 2012