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Flashcards in Wood Trusses Deck (27)
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1
Q

If trusses are stored horizontally for more than one week, blocking should be spaced:

A

On 8 - 10 foot centers

2
Q

What is the maximum allowable deflection when handling wood trusses?

A

6 inches in 20 feet

3
Q

When unloading trusses with a crane, the operator should not:

A

Attach to web members

4
Q

The minimum size lumber used as Lateral Restraint and Diagonal Bracing for wood trusses is:

A

2 x 4

5
Q

The location of trusses along their bearing support must be within what tolerance of the plan dimension

A

+ or - 1/4”

6
Q

What is the out of plumb tolerance for a truss with a 6’ rise?

A

1 1/2”

7
Q

Which is the proper placement of plywood when stacking on trusses?

A

Place over load bearing walls

8
Q

Minimum temporary bracing should always include:

A

Lateral and diagonal bracing

9
Q

What is the proper way to nail diagonal web bracing?

A

Use (2) 16d nails at each nailing point

10
Q

What is the maximum allowable spacing for diagonal bracing along top chords?

A

20 feet

11
Q

Can loads be placed on unbraced trusses?

A

NO

12
Q

If jobsite modification of a truss is needed:

A

Consult a professional prior to cutting

13
Q

What is the maximum allowable spacing for diagonal bracing along bottom chords?

A

15 feet

14
Q

When lifting trusses, only connect to the:

A

Top chord with a closed loop attachment

15
Q

What is the minimum number of lift points for single trusses up to 30’?

A

2

16
Q

The minimum ground bracing connections should consist of:

A

Two 16d nails clinched

17
Q

A 25 foot truss should not be installed if it has an overall bow that is greater than how many inche

A

1 ½”

18
Q

What is the maximum spacing for TEMPORARY bottom chord lateral restraint?

A

15’

19
Q

What is the maximum spacing for PERMANENT bottom chord lateral restraint?

A

10’

20
Q

What is the minimum requirements for lateral restraints

A

2” x 4”, lapped over two trusses

21
Q

All later restraint and diagonal bracing material should be made of what type of lumber?

A

2” x 4”

22
Q

How many nails should be used to attach each brace and/or lateral restraint to each truss?

A

2

23
Q

How should web diagonal braces be installed

A

At 45 degree angles and nailed with a minimum of two nails at each end and at each intersecting truss web.

24
Q

Diagonal bracing is required at each end of truss row and every _____ truss spaces?

A

10 truss spaces

25
Q

Temporary restraint and bracing connections shall be made with a minimum of how many nails

A

Two 16d nails

26
Q

If trusses are stored for more than one week they shall be protected from the environment but must have what?

A

Adequate ventilation

27
Q

What is the minimum size restraint / bracing material?

A

2x4 stress-grade lumber