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