Peeling paint on the fascia, a soft spot under the eaves, a rafter tail that crumbles when you press it with a screwdriver. Many San Diego homeowners first notice roof problems at the edge of the roof, not on top of it. That edge, where the roof, gutters and walls meet, is where water and wood spend the most time together, and it is where dry rot usually starts.
This guide explains what dry rot is, how to recognize it, why it is so often a roofing problem in disguise, how it differs from termite damage, and what repairs typically cost in 2026.
What Dry Rot Actually Is
Despite the name, dry rot is not caused by dryness. It is decay caused by wood-destroying fungi that grow when wood stays damp for long periods. The fungi break down the wood fibers, leaving lumber that looks dry, brittle and cracked into small cubes, or soft and spongy where it is still wet. By the time the damage is visible, it has usually been developing for months or years.
San Diego’s dry climate slows rot down, but it does not stop it. Wood that gets wet from the same source every time it rains or every time the sprinklers run never fully dries out, and that is all the fungi need.
Where Dry Rot Shows Up on San Diego Homes
| Location | Why It Rots | What You Will See |
|---|---|---|
| Fascia boards | Gutters overflow or leak behind, or water runs behind missing drip edge | Peeling paint, dark stains, soft or split boards behind the gutter |
| Exposed rafter tails | End grain soaks up water, common on Spanish and Craftsman homes | Cracked, crumbling or mushy rafter ends under the eaves |
| Eave boards and soffits | Leaks at the roof edge drip onto the underside | Stains, sagging boards, peeling paint on the underside of the overhang |
| Roof sheathing at the eaves | Failed underlayment, especially on older tile roofs | Soft deck near the edge, visible from the attic or during tear-off |
| Around chimneys and skylights | Failed flashing lets water into the roof deck | Stains on ceilings, rot found when flashing is removed |
| Patio cover rafters and beams | Low-slope covers that hold water | Rot at connections, sagging covers |
| Lower walls and trim | Sprinklers spraying the house, soil against wood | Rot at the base of trim, garage door jambs and posts |
Why Edge Rot Is Usually a Roofing Problem
Fixing the wood without fixing the water source is the most common and most expensive mistake. Fresh boards installed under the same leak will rot again. These are the roof-related causes we see most:
- Missing or poorly installed drip edge. Without drip edge, water can curl back under the roofing and run down the face of the fascia. Learn more in Understanding the Importance of Drip Edge.
- Gutters that overflow or leak. Clogged, undersized or poorly pitched gutters dump water against the fascia every time it rains. See our rain gutter guide.
- Worn underlayment on tile roofs. Water that gets past the tiles runs down the underlayment to the eaves. When the underlayment fails, the first wood to suffer is the sheathing and fascia at the bottom edge. Read why tile roofs leak with no broken tiles.
- Failed flashing. Walls, chimneys, skylights and roof-to-wall transitions channel water into the framing when flashing cracks or separates.
- Poor attic ventilation. Moist air trapped in the attic can condense on the underside of the roof deck, especially along the eaves.
Dry Rot vs. Termite Damage
Drywood and subterranean termites are both common in Southern California, and their damage can look similar to rot at first glance. The difference matters, because termites need treatment and rot needs a moisture fix.
| Clue | Dry Rot (Fungus) | Termites |
|---|---|---|
| Texture | Cracked into small cubes, crumbly or spongy | Hollowed galleries inside wood that may look intact on the surface |
| Debris | Fine brown powder or crumbling wood | Small pellets (drywood termites) or mud tubes (subterranean termites) |
| Location | Where wood stays wet | Can be anywhere, including dry wood |
| Fix | Remove decayed wood, fix the water source | Pest treatment plus wood repair |
In California, termite inspection reports used in home sales separate active infestation and damage (Section 1) from conditions likely to lead to problems, such as excessive moisture (Section 2). Dry rot often appears in these reports. If you are selling or buying, coordinate the pest report with a roof inspection so the cause of the moisture gets fixed, not just the wood. Our pre-sale roof inspection guide explains how this fits into escrow.
How to Check Your Home for Dry Rot
- Walk the perimeter and look up at the fascia and eaves for peeling paint, stains and gaps behind the gutter.
- Probe suspicious spots with a screwdriver. Healthy wood resists, rotted wood lets the tip sink in or crumbles.
- Check rafter tails on homes with exposed eaves, especially at the ends and where they meet the wall.
- Look in the attic along the eaves with a flashlight for dark stains, daylight or soft sheathing.
- Watch during rain for gutters overflowing or water running down the face of the fascia.
- Check sprinkler spray to make sure it is not hitting walls, trim or posts.
How Dry Rot Is Repaired
| Repair Method | When It Is Used | What to Expect |
|---|---|---|
| Epoxy consolidant and filler | Small areas of shallow decay in otherwise sound wood | Decayed wood removed, epoxy hardens the remaining fibers, then shaped and painted |
| Board replacement | Fascia, trim or eave boards with deeper decay | New boards cut to match, primed on all sides, then painted |
| Sistering or rafter tail replacement | Rotted rafter ends that still have sound framing behind them | New lumber attached alongside or spliced in to restore the overhang |
| Sheathing replacement | Rotted roof deck found during roofing work | Sections replaced before new underlayment and roofing go on |
| Structural repair | Rot that reaches rafters or beams beyond the overhang | May require engineering and a permit |
Whatever the method, a good repair includes three things: removing all decayed wood back to sound material, sealing and painting every surface of new wood (including the ends and back side), and correcting the water source so it does not happen again.
DIY or Call a Pro?
A small patch of soft wood on a single-story trim board is a reasonable weekend project for a handy homeowner with epoxy filler, primer and paint. Call a professional when any of these apply:
- The rot is on a second story or requires working from a ladder near the roof edge
- Rafter tails or roof sheathing are involved, not just trim
- The damage keeps coming back in the same place after previous repairs
- You see stains or soft spots inside the attic as well as outside
- Gutters have to come down to reach the fascia
- The home is being sold and the repair needs to satisfy an inspection report
In those cases, the wood repair is only half the job. A roofer can find and correct the water source at the same time, which is what makes the repair last.
Dry Rot Repair Costs in 2026
Costs depend on how much wood is affected, how high it is and whether the roofing has to be opened up to reach it. These typical ranges come from national 2026 cost data and our own San Diego cost guide.
| Repair | Typical Cost |
|---|---|
| Fascia and soffit replacement or repair (typical project) | About $1,050 to $3,300 |
| Fascia and soffit, per linear foot including labor | About $6 to $20 |
| Water-damaged fascia repair | About $10 to $23 per linear foot |
| Dry rot repair | About $500 to $4,000 depending on extent |
| Roof sheathing replacement during roofing work | About $75 to $150 per sheet |
| Minor structural wood repair | About $500 to $1,500 |
| Moderate structural damage | About $1,500 to $4,000 |
| Major structural repair | $5,000 or more |
| Painting new fascia | About $2.50 to $6.50 per linear foot |
Two-story homes and hard-to-reach areas typically add cost. The structural repair ranges come from our roof replacement cost guide, where we explain why hidden wood damage is the biggest unknown in any roofing estimate.
Dry Rot and Roof Replacement
Roof replacement is the best time to deal with edge rot, because the roofing is already off and every board along the eaves can be inspected. It is also when hidden damage gets discovered, which is why contracts should include clear unit prices for extra work. Ask for these in writing before you sign:
- A price per sheet of roof sheathing
- A price per linear foot of fascia or eave board
- A price per rafter tail repair
- How you will be notified and asked to approve extra work before it is done
- Photos of any damaged wood that is replaced
With unit prices agreed in advance, a surprise in the attic becomes a predictable line item instead of a negotiation. Our roofing estimate breakdown shows how these items appear on a quote.
Preventing Dry Rot
- Keep gutters clean and make sure they drain toward the downspouts
- Make sure drip edge is installed at every roof edge
- Repaint fascia and trim before the paint fails, sealing end grain and joints
- Adjust sprinklers so they do not hit walls, trim or posts
- Keep soil, mulch and firewood away from wood siding and trim
- Have the roof inspected every few years, especially tile roofs over 20 years old
- Replace old underlayment before it fails, rather than after the eaves rot
Frequently Asked Questions
What causes dry rot on fascia boards?
Dry rot is caused by fungi that grow in wood that stays damp. On fascia boards, the moisture usually comes from overflowing or leaking gutters, missing drip edge, worn roof underlayment at the eaves or sprinklers hitting the house.
How much does it cost to repair dry rot on eaves?
Typical fascia and eave repair projects run about $1,050 to $3,300, and dry rot repairs about $500 to $4,000 depending on how much wood is affected. Damaged roof sheathing found during a roofing project typically costs about $75 to $150 per sheet.
Is dry rot covered by homeowners insurance?
Usually not when it results from long-term moisture or maintenance issues. Insurance is more likely to respond to sudden, covered events. Check your policy and talk to your agent about your specific situation.
Can dry rot spread?
Decay can continue to spread through wood as long as moisture is present. Once the wood dries out and the water source is fixed, decay stops, but damaged wood does not regain its strength and should be repaired or replaced.
How do I tell dry rot from termite damage?
Rot leaves wood cracked into small cubes or spongy, usually where water collects. Drywood termites leave small pellets and hollow galleries, and subterranean termites leave mud tubes. A licensed pest inspector can confirm.
Should I fix dry rot before replacing my roof?
The two should be planned together. Edge rot is often caused by roof or gutter problems, and the roofing usually has to come off to repair rotted sheathing and fascia properly.
Seeing rot or peeling paint at your roof edge? Dana Logsdon Roofing & Solar has been inspecting and replacing roofs in San Diego County since 1994. We will check the roof edge, decking, flashing and gutters and pinpoint where the water is coming from. Call (619) 390-8177 or schedule a roof inspection.
