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Use treated lumber blocking that’s the same size as the joists (usually 2x8 or 2x10). Install the blocking in rows along a chalk line snapped at a right angle to the joists. You’ll have to measure and cut each block separately to get a snug fit, since the joists are never exactly the same distance apart. Staggering the blocking in a step pattern allows you to easily drive nails from both sides, rather than having to toenail.
Photo 2. Square each block to the joist and drive three 16d galvanized box nails through the joists into each end of the block. Repeat for each row.
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