Where two pieces of fascia meet at an outside corner, they are usually cut at forty-five degrees and joined in a miter. That joint is the spot most homeowners never see, and it is one of the places a leak can start without any visible roof damage. The miter sits directly under the gutter corner, so water that overshoots the gutter, or leaks out of a joint in the gutter itself, lands on the end grain of the board. End grain takes in water much faster than the face of a board. Once the corner stays wet through a few freeze-thaw cycles, the wood softens from the inside while the paint still looks fine.
The water does not stop at the corner. It runs behind the gutter, down the back of the fascia, and into the soffit or the top of the exterior wall at the eave. The ceiling stain you see may sit several feet from the corner, along the wall just inside the eave, and it often appears only after a driving rain from one direction. That is why people look at the ceiling first, find nothing above it that looks wrong, and chase the problem somewhere else. A stain near an exterior wall at the eave is worth checking at the fascia corner before anyone reaches for the roof.
Leak and repair
Start on a dry day. Have someone stand at the bottom of the ladder while you look at the joint from a few feet away. Look for a hairline opening at the miter, paint that bubbles or has peeled in a line along the joint, and sealant that has pulled away from the corner or cracked into a row of small gaps. Then press the tip of a flat screwdriver into the wood near the joint, on the face and on the end grain. Sound wood resists. Soft wood takes the tip in easily, and the fibers look dark and stringy when you pull the tip out.
Check the underside too. Look up at the soffit at the corner for a dark stain, a sag, or a soft spot where the panel meets the fascia. If the soffit is open, look into the eave from below and check the rafter tails and the top edge of the exterior wall sheathing for darkening. A look from the attic side helps if the attic is accessible above that wall. Wet sheathing or a dark line along a rafter tail tells you the water has gotten past the fascia, and that changes the scope.
Caulk alone usually does not fix a miter that has started to rot. A bead of sealant over soft end grain can look finished for a season, but the board keeps moving with temperature and moisture, the joint opens again, and water keeps working under the bead. Caulk is a finish for a sound joint. It is not a repair for wood that has already lost its strength.
A proper repair starts by cutting back to sound wood. Often that means removing the gutter section at the corner, cutting the fascia square until the saw cut is clean, and replacing the corner or splicing in a new piece of board that is solid end to end. The new piece needs to be fastened into solid wood, not into the area that was soft, so the gutter hangers that attach at that corner land on material that will hold them. Prime every face of the new board, including the cut ends, before it goes up. Painting only the visible face leaves the end grain open to water, and that is the same condition that started the rot.
Look at the drip edge and the eave underlayment while the fascia is off. The drip edge should tie into the fascia face and carry water away from the board, and the underlayment should run over the edge so water sheds onto the gutter. If the drip edge is bent back, missing at the corner, or lapped the wrong way, the fascia repair will not keep water off the board. If the eave decking shows wet staining, it has to be dried and fixed before the roof line is closed.
Keys documents the damage with photos and measurements, and gives you a written scope with those photos before any work starts. Keys attends as the contractor while you deal with your own insurer. Under Missouri law, RSMo 407.725, a roofing contractor is barred from representing or negotiating a homeowner's insurance claim, and a contractor may not say anything about paying, waiving or covering a deductible. Those conversations belong between you and your insurer.
What it costs
The price of a fascia miter repair depends on how much board has to come out and what sits behind it. A small, isolated corner with sound wood a few inches back from the joint is a short job. It includes gutter removal, the board, prime and paint, and reinstalling the gutter section. If the rot runs back along the fascia, or reaches the rafter tails or the sheathing at the top of the wall, the job grows, because each of those has to be cut back and replaced before the new board can be fastened.
Ask for the fascia repair to be written as its own line, with a length in feet and a price per foot for replacement board, so the number moves in a known way if rot turns up partway through. Ask whether gutter removal and reinstall is included or priced separately. Ask whether paint covers all faces. A quote that says fascia repair with no length, no material, and no paint line leaves the largest surprises for the day the old board comes off.
Caulk is the cheapest visit and the one most likely to come back. A repair that cuts back to sound wood costs more on the first visit, but it is far more likely to hold, because the rot that caused the leak is removed rather than covered.
What to ask
- Will you probe the miter with me from the ground and from the ladder, so I can see the soft wood before we agree on a scope?
- How far back will you cut the fascia, and how will you confirm the wood is sound before the new board goes on?
- What species and thickness of board are you using, and is the new piece solid end to end, or spliced?
- Will every face and every cut end be primed before installation, and is paint included in the price?
- Where will the gutter hangers land after the repair, and will any hanger be moved into fresh wood?
- If rot reaches the rafter tails or the top of the wall sheathing, how is that priced, and will you stop and show me before you continue?
- Will you put the photos and measurements of the joint, the soffit, and the drip edge into a written scope that I keep?
If you want someone to look at the corner before the next rain, call the Keys office at (314) 220-2333. Have ready the stain photos, the date you first saw the water, and notes on which direction the wind was blowing during the last storm that wet the wall.