Slide 41 of 67
Notes:
- Effect of Lumber Grade on Hold-Down Capacity
- The grade of douglas fir-larch for the hold-down stud can determine the available strength of a hold-down devices.
- Discussion:
- For tension, construction or better grade will work
- For compression, only No. 1 will work
- Likewise for the sill plate, you must use Douglas fir-latch
- Assume you need lumber with 7500 lbs value
- Note that 5 grades of lumber are listed for this catalogue value
- Half the time it won’t work unless the lumber is the correct type and grade
- Verify that the proper grade and size of lumber
- When hold-down devices installed on new framing members, be sure to verify that the proper grade and size of lumber is used.
- Otherwise, hold-down may be attached to a framing member that is too weak to resist the required uplift.
- Now let us assume that we have done everything right…..what happens next?
Who may come in and mess it up?
- Electricians and plumbers!
- They will take the easiest route…which is usually right through the shear wall
