If projected repair cost is more than 60% of a from-scratch replacement, replace. Below 60% and the pilings are sound, repair. This is the same rule insurance adjusters use.
The 60% rule
Structural triggers that force replacement
- Waterline decay on more than 30% of pilings
- Visible sag or settlement in the deck
- Framing rot at more than 25% of joist connections
- Failed permitted footprint (e.g., bulkhead movement)
- Dock age over 25 years on pressure-treated, or over 35 years on IPE
When repair is the right call
- Decking is degraded but framing and pilings are sound — board replacement only
- Hardware corrosion without structural rot — full re-fastening with 316 stainless
- Storm damage to a single section — partial rebuild
- Float drum failure on an otherwise sound floating dock — float replacement
ML
About the author
Mark Lipe is the founder of Intracoastal Installs LLC. He has been building structures for 35 years and docks on the North Carolina coast since 2022 — he writes from direct field experience, not marketing copy.
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