How to Repair Rotted Fascia Board

Fascia board sits at the roofline where your gutters attach, which makes it the first line of defense against water running off your roof and the last thing water damages before it gets into your walls. When fascia rots, it usually starts as a dark stain or soft spot behind the gutter, then spreads until the board can't hold fasteners anymore and your gutter starts pulling away from the house. Most fascia rot happens because gutters overflow, drip edges are missing, or the fascia itself was never primed on the back side before installation. Replacing a section of rotted fascia is straightforward carpentry that requires working from a ladder at roof height, cutting precise angles where the new board meets the old, and understanding that the real repair includes fixing whatever caused the rot in the first place. Done properly with the right materials and back-priming, a fascia repair will outlast the surrounding boards. Done quickly without addressing drainage, you'll be back up the ladder in three years cutting out rot again.

1. Remove the gutter section and inspect the damage. Take down the gutter run in front of the rotted fascia by removing the hidden hangers or ferrules. Pry off any trim or drip edge covering the top of the fascia board. Probe the board with a screwdriver or awl to find where solid wood begins on either side of the rot. Mark cut lines at least six inches past the last soft spot, positioning cuts over rafter tails if possible so you have solid backing.
2. Cut out the rotted section. Set your reciprocating saw blade depth to match the fascia thickness so you don't cut into the rafter tails. Make vertical cuts at your marked lines, keeping the blade perpendicular to the fascia face. If the rot extends behind siding or soffit, cut those back far enough to get clean wood for a proper repair. Pull out all the rotted material and any old nails left in the rafter tails.
3. Install blocking between rafters. If your cuts don't land over rafter tails, cut blocks from the same material as your new fascia and screw them horizontally between rafters to provide backing for board ends. Position blocks so half the width supports the old fascia and half supports the new. Use three-inch deck screws driven at angles into the rafter tails to secure blocking solidly.
4. Cut and prime the replacement board. Measure the opening and cut your replacement fascia to length, checking that it matches the existing board profile and width exactly. Bevel the ends at slight angles if needed to create tight joints against the old boards. Prime all six sides of the new board with exterior primer, paying special attention to the back face and cut ends where water penetration starts. Let primer dry completely.
5. Install the new fascia section. Hold the new board in position and drive two three-inch deck screws through the face into each rafter tail or block, keeping screws centered and level. Countersink screw heads slightly below the surface. Check that the new board aligns perfectly with adjacent fascia both horizontally and in depth from the house. Shim behind the board if needed to maintain consistent alignment.
6. Seal all joints and fill screw holes. Run a heavy bead of paintable exterior caulk along both vertical joints where new wood meets old, tooling it smooth to create a water-shedding transition. Fill screw holes with exterior wood filler and let cure. Caulk the top edge where fascia meets drip edge or siding, since this joint is where water most often gets behind the board.
7. Prime and paint the repair. Spot-prime any bare wood showing after caulking, then apply two coats of exterior paint matched to your existing trim color. Extend paint slightly onto the old fascia on each side to blend the repair. Paint should cover all caulk joints completely to seal them against UV degradation.
8. Reinstall gutters and fix drainage issues. Hang the gutter section back in place with new hidden hangers positioned over solid wood every sixteen inches. Adjust gutter pitch to ensure proper drainage away from the repaired area. Clean debris from gutters and downspouts, and verify that water flows completely off the roof without backing up behind the gutter. Install or repair drip edge if missing.