Outdoor decks take a beating–from rain, freeze/thaw cycles, even wind-blown sand. But sunlight causes the most damage, since ultraviolet (UV) radiation initiates the photochemical degradation that kickstarts weathering. First, wood changes color, but soon fibers start to loosen from the surface and are eroded away by the elements. That’s why every wood deck–even when built with decay-resistant or pressure-treated lumber–needs to be protected by a good finish that blocks UV rays and moisture and delays the natural weathering process. Continue reading →