Wood Restoration Problems

Make restoration decisions that fix the root cause—not just the symptom. This category organizes the most common wood failures—graying, stains, biological growth, and rot—into clear diagnosis and repair paths. You’ll find side-by-side chemistry choices (oxalic acid, oxygen bleach, sodium hypochlorite), structural repair logic (consolidate vs replace), and maintenance calendars that reduce 10-year cost.

Start Here: Diagnose Before You Treat

Confirm the problem type (UV graying vs tannin/iron stains vs mold/mildew/algae vs soft rot) and identify the moisture source that’s feeding it. Then match chemistry and repair depth to the actual failure.
Read next: Wood Restoration

Discoloration & Staining (Non-Biological)

  • UV Graying: Sun-killed lignin turns wood gray and rough. Restore color with an oxalic-based brightening step, then protect.
    Read next: Greyed Wood Restoration

  • Tannin & Extractive Stains: Brown streaks, tea-colored weeping, and black drip marks—especially on cedar/redwood and near fasteners. Use the right cleaner sequence and pH neutralization to avoid fiber damage.
    Read next: Remove Stains from Wood Siding & Decks

  • Nail & Screw Staining: Blue-black halos from iron-tannin reactions or galvanic corrosion; fix the chemistry and the hardware choice.
    Read next: Nail & Screw Staining on Wood

Biological Growth (Mold, Mildew, Algae)

Separate true mold remediation from cosmetic mildew cleanup and algae slicks; pick chemistry by surface and risk profile.

Structural Decay & Repairs (Rot Pathways)

Decide whether to stabilize, patch, or replace—based on cross-section lost, load, and embedment.

Chemistry & Process Control

Pick the right tool for the job—and neutralize or rinse correctly to avoid finish failure later.

Prevention & 10-Year Cost

After the fix, keep water moving off the surface, break ground contact where possible, choose finishes that match your sun/shade and maintenance appetite, and calendar light-touch maintenance before failure.
Read next (overview): Wood Restoration

Serene wooden dock with a forested lake view under a bright summer sky in Sweden.

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