For truss spans greater than 60’, a strong-back should be attached to the top cord and web members at intervals of approximately
10 feet
The approximate out-of-plane tolerance for a 20’long truss is
1-1/4”
The spacing of trusses along the bearing support should be within _______________ of the plan dimensions.
+/- 1⁄4”
What is the maximum allowable stack height of plywood or OSB on trusses (assume trusses designed with a live load of 40 psf or greater).
16 feet
Which of the following is not correct?
Storing of trusses in a vertical position should be strictly prohibited
For jobsite storage wood trusses must be supported at intervals not exceeding _______________ feet.
10
Cutting or drilling of truss members in the field must be approved by the
Engineer
According to BCSI, top chord bearing parallel chord trusses should have a maximum gap between the inside of bearing and the first diagonal of vertical web of
1⁄2”
Chord trusses may buckle or collapse if they do not have temporary lateral bracing and temporary
diagonal bracing
What span length of truss can be safely lifted without the use of a spreader?
30’ or less
What is the recommended size and length of the lumber to be used for temporary bracing for truss erection?
2 x 4, by 10’
12. Given:
Top Chord Size: 2 x 10
Grade: No. 1 Southern Pine
Maximum
spacing between rows of lateral restraint: 8 feet
What is the maximum truss span that can be safely restrained?
40 feet
The maximum gap between the inside of the first diagonal bearing and
the bearing wall of a top chord
bearing flat or parallel chord
truss is
1⁄2”
For web diagonal braces, used for wood trusses, they must be
installed so that they cross at about 45◦ and
are nailed at a
minimum of
2 each 16d nails
A contractor is going to set a 70’ long wood truss. According to BCSI, it must be picked with a strongback attached to the top chord and web members at intervals of approximately
10 feet
According to BCSI, when setting 40’ trusses with a 5/12 slope the
bottom chord must have temporary
bracing spaced at a maximum of
15’
The maximum bow for a truss length of 25 feet is
1-1/2”
Any correction, which involves the cutting or drilling of truss members in the field must be approved by the
Engineer
Temporary lateral bracing is not sufficient to prevent the collapse of group trusses; it should always be used in conjunction with _______________ braces.
diagonal
The top chord lateral bracing would be spaced at _______________ feet for a 40’ truss at a slope of 4/12.
8’
For a 40’ span scissor truss with 5/12 slope and a pitch difference
of 3, would require top chord lateral
bracing spaced at
8’
What is the maximum length of truss that can be picked without the use of a spreader bar?
30’
When installing 2 x 4 diagonal bracing _______________ nails are used.
2 – 16 d
The maximum top chord temporary lateral restrain spacing for a truss span 30-45 feet is
8 feet on center
With lateral bracing at least_______________ trusses should be lapped.
2