Joist Spacing and Blocking 101

Joist Spacing and Blocking
Quick Reference Guide
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Regardless of whether your frame is new or not, consider these:
• Check for soft spots, broken pieces, splits, cracks and other damage to the
wood from moisture or the elements
• The frame should be securely fastened to the home and/or to a properly
secured post and beam frame; no floating sub-structures
• Ensure the framing is held with exterior grade screws; it may require
fastening reinforcement
• Inspect framing for separation due to contraction of structural lumber and
ensure all fasteners are sound and showing no signs of corrosion
• Additional exterior grade screws may be required to secure existing framing
• Look for any highs/lows/uneven joists; joists must be even and in plane across
the tops of each- use a tight string line to verify
• There should be a drip cap, flashing or other system in place at ledger board
and wherever framing meets the home to move water away from the home
and away from the deck
• Note any screws or fasteners that may be protruding on the surface of the joist
will need to be removed
Best practice is to ensure your deck framing is structurally sound; if you are
unsure, call a professional.
Check Your Framing Before Laying the First Board
STEP ONE