All glossary terms
Materials
Soffit and Fascia
Definition: Soffit is the horizontal underside of a roof overhang. Fascia is the vertical board at the edge of the overhang where gutters attach. Both protect the roof structure and house from weather damage.
Soffit and fascia are the trim around the edge of your roof. They look like cosmetic details but they do critical structural work — sealing the rafter ends from weather, providing ventilation intake for the attic, and anchoring the gutter system.
**Soffit.** The horizontal surface you see when you look up under the eaves. Comes in solid, perforated (vented), or hidden-vent versions. Perforated soffit is essential for attic air intake — without it, your ridge vent has nothing to draw from and your attic overheats in summer.
**Fascia.** The vertical board at the front of the eave where your gutters attach. Usually 1×6 or 1×8 pine or PVC. Cedar fascia rots if not maintained; aluminum-wrapped or PVC fascia is now standard on quality re-roofs.
When to replace soffit/fascia: during any full re-roof. Removing and reinstalling shingles damages adjacent trim, so replacement is the right call if your existing trim is wood, weathered, or showing rot. Skipping it usually means paying for fascia patches within 2-3 years.
For estimating: soffit and fascia are per-linear-foot add-ons ($10-$25 per LF installed for aluminum, $15-$35 for PVC). Most quality re-roof quotes include them as a default upgrade rather than an upsell — the price is small relative to the roof but the curb-appeal lift is significant.