Symptom: PT lumber has turned a dull greenish-gray, blackened in spots (especially near irrigation), and feels dried-out to the touch.
Cause: Kiln-dried PT needs sealing within 30–60 days of install, and every 2–3 years after. When skipped, the chemical treatment migrates unevenly, surface checks form, and UV darkens the lignin.
How RKC fixes it: Deep wash with a wood brightener to neutralize the darkening, dry cycle, then oil-based semi-transparent stain (oil penetrates PT better than water-based). Re-oiling every 2–3 years keeps PT looking like cedar-quality for its full 10–15 year life.