Fascia is one of those construction elements most homeowners never think about - until something goes wrong. It’s the vertical board that runs along the edge of your roofline, connecting the bottom of the roof to the soffit below. Small component, massive responsibility. What fascia actually does: It seals the vulnerable gap where your soffit meets the roof edge. This junction is a prime entry point for water, especially during heavy rain or snow melt. Without fascia, water runs down the roof an