previous
  • All about Roofing
    All about Roofing
  • Magazine Departments
    Magazine Departments
  • Video Series: Install a Rock-Solid Tile Floor
    Video Series: Install a Rock-Solid Tile Floor
  • Read FHB on Your iPad
    Read FHB on Your iPad
  • Clever daily tip in your inbox
    Clever daily tip in your inbox
  • Remodeling in Action
    Remodeling in Action
  • Basement Remodeling Tips
    Basement Remodeling Tips
  • Video: Install a Fence
    Video: Install a Fence
  • Master Carpenter Videos
    Master Carpenter Videos
  • Energy-Smart Details
    Energy-Smart Details
  • 7 Trim Carpentry Secrets
    7 Trim Carpentry Secrets
  • Deck Design & Construction
    Deck Design & Construction
  • Tips & Techniques for Painting
    Tips & Techniques for Painting
  • 12 Remodeling Secrets
    12 Remodeling Secrets
  • 9 Concrete Countertops Ideas
    9 Concrete Countertops Ideas
  • 7 Smart Kitchen Solutions
    7 Smart Kitchen Solutions
  • Solid Deck-Framing Advice
    Solid Deck-Framing Advice
  • 7 Small Bathroom Layouts
    7 Small Bathroom Layouts
  • Video: Build a curved step
    Video: Build a curved step
  • Gallery: Custom Flooring
    Gallery: Custom Flooring
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