Slide 33 of 67
- Flat Blocking
- Blocking can be installed flatly if it provides the minimum penetration depth for the fasteners.
- Flat installation of blocking: + more nailing surface + better edge distances.
- When flat: a minimum thickness of 1½-inch lumber should be used to nail sheathing with 6d and 8d common nails.
- Larger nails, like the 10d common, require 1¾-inch thick lumber
- When 1½-inch flat blocking is used for 10d common nails, shear walls will lose 16 percent of their strength.
- The figure shows an example of a wall that is 8 or 10 ft high; sheet of plywood won’t reach entire height. Row of blocks is added. Flat blocking is shown here placed between each vertical stud. This shows 3-inch blocking which is ok for 6d or 8d common nails, but not for 10d and 16d nails
- Note that contractor can turn the block up in order to obtain a bigger nailing surface OR use 3x4 instead of 2x4.