Wood Trusses Flashcards
If trusses are stored horizontally for more than one week, blocking should be spaced:
On 8 - 10 foot centers
What is the maximum allowable deflection when handling wood trusses?
6 inches in 20 feet
When unloading trusses with a crane, the operator should not:
Attach to web members
The minimum size lumber used as Lateral Restraint and Diagonal Bracing for wood trusses is:
2 x 4
The location of trusses along their bearing support must be within what tolerance of the plan dimension
+ or - 1/4”
What is the out of plumb tolerance for a truss with a 6’ rise?
1 1/2”
Which is the proper placement of plywood when stacking on trusses?
Place over load bearing walls
Minimum temporary bracing should always include:
Lateral and diagonal bracing
What is the proper way to nail diagonal web bracing?
Use (2) 16d nails at each nailing point
What is the maximum allowable spacing for diagonal bracing along top chords?
20 feet
Can loads be placed on unbraced trusses?
NO
If jobsite modification of a truss is needed:
Consult a professional prior to cutting
What is the maximum allowable spacing for diagonal bracing along bottom chords?
15 feet
When lifting trusses, only connect to the:
Top chord with a closed loop attachment
What is the minimum number of lift points for single trusses up to 30’?
2
The minimum ground bracing connections should consist of:
Two 16d nails clinched
A 25 foot truss should not be installed if it has an overall bow that is greater than how many inche
1 ½”
What is the maximum spacing for TEMPORARY bottom chord lateral restraint?
15’
What is the maximum spacing for PERMANENT bottom chord lateral restraint?
10’
What is the minimum requirements for lateral restraints
2” x 4”, lapped over two trusses
All later restraint and diagonal bracing material should be made of what type of lumber?
2” x 4”
How many nails should be used to attach each brace and/or lateral restraint to each truss?
2
How should web diagonal braces be installed
At 45 degree angles and nailed with a minimum of two nails at each end and at each intersecting truss web.
Diagonal bracing is required at each end of truss row and every _____ truss spaces?
10 truss spaces
Temporary restraint and bracing connections shall be made with a minimum of how many nails
Two 16d nails
If trusses are stored for more than one week they shall be protected from the environment but must have what?
Adequate ventilation
What is the minimum size restraint / bracing material?
2x4 stress-grade lumber
