Joist Spacing and Blocking 101

Joist Spacing and Blocking
Quick Reference Guide
TimberTech.com | 9Questions: 1.877.275.2935
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: Reverse Crowned Joist
(down)
POTENTIAL SOLUTIONS:
• Remove and replace
• Leave the crowned joist and
apply sister joists (sandwich the
board w/ 2 new joists)
STEP ONE
Check Your Framing Before Laying the First Board
PROBLEM: Crowned Joist (up)
POTENTIAL SOLUTIONS:
• Remove and replace
• Use a power planer or power
sander