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