What Can Happen to Unbraced Wood Truss Web Members? Part III

Posted by in Case Studies, Wood | February 25, 2020

So, to continue on from last weeks post.

How did we know that the wood trusses had buckled sideways previously and were reset?

Examination of the top chord in the featured photograph shows two nails saw off flush with the top of the chord.  These were the first pair of nails that fastened the lateral bracing to the top chords of the trusses. 

Note also in a close-up (Figure 1) there are also two nail holes.  These holes are from the second pair of nails that fastened the lateral bracing to the top chords of the trusses.    

Figure 1 Note a pair of nails cut flush with
the top of the top chord (as evidenced by the saw marks
in the wood) and a pair of nail holes.

These are the type of details that we look for to help us to identify the cause and history of a collapse or appearance of damage.

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