Deck boards splintering and rough underfoot — San Jose, California

Deck boards that develop raised splinters, rough patches, and fuzzy grain are suffering from UV degradation and moisture cycling. As the sun breaks down the wood's lignin and repeated wetting-and-drying cycles loosen the fibers, the surface becomes increasingly rough and dangerous—especially for bare feet. Pressure-treated pine and cedar are both susceptible after 2–4 years without protective finish. The repair depends on severity: light splintering can be sanded smooth with 60–80-grit sandpaper and sealed with a penetrating deck stain; moderate cases benefit from a belt sander or deck-resurfacing orbital sander; severe boards with deep checks and structural splitting should be replaced. A carpenter can sand, seal, and selectively replace boards to restore a safe, smooth walking surface.