Engineered Framing – Trusses Used in Roof Framing
Typical truss construstion

Typical truss construstion

Most roof framing today are pre-manufactured trusses.

Poor quality materials have caused this truss to fail

Wood (and steel for that matter) trusses are among the most efficient structural components there are. This is due to their shape and construction; and to the extreme competitiveness of the truss industry. There is virtually no extra material in a pre-

Truss failure, requires engineering and repairs.

Major concern-trusses separating – ceiling sagging

engineered roof or floor truss. If, for example, a truss manufacturer used 2×6’s where 2×4’s would work, he’d lose a lot of bids.  These structures are carefully engineered.  There can be NO STRUCTURAL MODIFICATIONS of any kind to a truss without engineer’s approval.  It is common to see these cut, drilled, notched and otherwise modified or repaired.  Often  engineering is not done and an inspector

 

should call for proper repairs.

Separation of the truss, needs engineering to be repaired

Section 802.10.4 of the 2003 IRC says: “Truss members shall not be cut, notched, drilled, spliced or otherwise altered in any way without the approval of a registered design professional.”

In these cases, a registered engineer in required to specify what repairs are acceptable.

Modified trusses in barn – cords have been removed and a beam was installed apparently without a permit or engineering.

About

JJ & Suzanne are both licensed, highly skilled inspectors and educators. We are the authors of our class curriculum, and truly enjoy sharing this with our students

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