Joist Spacing and Blocking 101

Joist Spacing and Blocking
Quick Reference Guide
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It may be necessary to shim, notch, plane, or replace joists due to size variations,
crowning, reverse crowning, or improperly positioned joists/framing. Be sure to sort
and exclude any extremely crowned and/or twisted joists/lumber material.
PROBLEM: High Joist
POTENTIAL SOLUTIONS:
• Remove and replace
• Cut fasteners and lower.
Reattach.
• Use a power planer or power
sander
STEP ONE
Check Your Framing Before Laying the First Board
PROBLEM: Low Joist
POTENTIAL SOLUTIONS:
• Remove and replace
• Leave the low joist and apply
sister joists (sandwich the board
w/ 2 new joists)
• Cut fasteners and raise.
Reattach.