Joist Spacing and Blocking 101

Joist Spacing and Blocking
Quick Reference Guide
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Place solid wood blocking between
each joist, placed in rows at maximum
every 4’ - 6’ within the structure.
Use exterior grade screws & fasten
through the outside of the joist into
blocking.
Stop!! Always make sure your joist, blocking and any added framing are even and in
plane with each other across the tops.
Must be
flush/even
with top of
joists
TOOLS NEEDED:
• Safety glasses
• Appropriately sized
solid wood blocking,
typically "the same
size as the joists
• Drill
• Hammer
• Level 4' or longer
• Miter saw/ circular saw
• Exterior grade screws
• Tape measure
RECOMMENDED
MANPOWER:
1 Person*
STOP
Required Blocking
STEP THREE
*Estimate based on a 12'x12' deck. Installation time may vary based on the design complexity and experience of the installer.