Short Answer
Common contributors include water intrusion, overflowing gutters, failed flashing, roof leaks, poor drainage, and failed sealants.
Detailed Explanation
Fascia rot is almost always a water-management problem. The most common causes include: gutters that overflow or leak, allowing water to run behind the gutter and saturate the fascia board; roof leaks at the eave that allow water to reach the fascia from above; failed or missing drip edge flashing that allows water to curl back under the roof edge and wet the fascia; inadequate roof ventilation that causes condensation at the eave; and failed sealants at joints or penetrations that allow water to enter the fascia. Because fascia is typically made of wood, once it gets wet and stays wet, rot develops. The key to preventing fascia rot is proper water management — functioning gutters, proper drip edge, and good flashing.
Why It Matters
Fascia rot is a symptom of a water-management problem. Replacing rotted fascia without fixing the cause ensures the new fascia will rot too.
Common Mistakes
- ✕Replacing rotted fascia without identifying and correcting the water source
- ✕Installing gutters over rotted fascia
- ✕Not checking fascia condition during roof replacement
Questions to Ask Your Contractor
- ?What's causing the fascia to rot?
- ?Are the gutters overflowing or leaking?
- ?Is the drip edge properly installed?
- ?Is there adequate ventilation at the eave?