Should you repair or replace your fiber-cement siding?
Updated August 2026
← Every repair-or-replace call
Repair, almost always: a cracked or impact-damaged plank swaps out for $300–1,200, while a full re-side runs $12,000–25,000. Fiber cement is rated for 30–50 years and it does not rot, warp, or feed insects, so the boards on a 20-year-old wall usually have decades left even where a ladder or a mower-thrown rock broke one. Individual planks come out and go back in with a slate ripper and new nails. The only fair reasons to re-side are storm damage across whole elevations or an original installation done wrong, which is a different problem from worn siding.
The short version
Half of a $12,000–25,000 re-side is more than $6,000, and no plank swap comes anywhere near that, so on a sound wall you repair, caulk the joints, and repaint. Where the decision actually turns is the finish and the install. Factory-finished boards hold color 15–25 years and field-painted ones 10–15, and once the paint fails, fiber cement starts drinking water at the cut ends and butt joints, which is where it eventually gives up. Workmanship is the other tell. Boards nailed too tight, butted with no flashing behind the joints, or run down into the dirt with no clearance will crack and swell all over the wall, and patching that house one plank at a time never ends. That is the case where a full re-side is the honest answer.
Your situation, decided
| Situation | Verdict | Why |
|---|---|---|
| One or two planks cracked by impact | Repair | A $300–1,200 plank swap on siding with decades left |
| Paint chalking or peeling across the house | Repair (repaint) | A $4,000–10,000 repaint protects the boards for 10–15 years |
| Swelling and crumbling at butt joints and cut ends | Repair the joints | Flash and seal the joints; the field boards are still sound |
| Cracks along the nail line throughout the wall | Replace | Nails were over-driven at install; the wall keeps failing |
| Siding buried in soil or tight against a deck | Repair with clearance | Cut back to 6 inches above grade; wicking is the real fault |
What each path costs
Repairs typically run $300–1,200; a replacement is $12,000–25,000 installed. Fiber cement lasts 30–50 years, and the paint is the clock: 10–15 years field-applied, 15–25 factory-finished. Repaint on schedule and the boards outlast most roofs. Price your own number on the home maintenance cost calculator before you commit either way.
The repair-or-replace call is easy when you know the unit's age and service history. OnOtto keeps both, plus the maintenance that delays this decision for years.
Start your home's service log, freeFrequently asked questions
How do I tell fiber cement from vinyl or engineered wood?
Knock on it. Fiber cement sounds dense and dull, like tapping a sidewalk, while vinyl rattles and hollow-backed engineered wood thuds. A plank is heavy, roughly 2.3 pounds per square foot, so a single 12-foot board takes two people to carry. Look at a cut end at a corner or under a window: fiber cement shows a gray, gritty core beneath the paint, not wood grain or a plastic profile. Nail heads are usually hidden under the course above. If you are still unsure, the material overview covers the tells.
Can I swap a damaged plank myself?
It is a moderate job with one real hazard. You pry the course above, cut the nails with a slate ripper, slide the broken plank out, and blind-nail the new one, which takes patience rather than special skill. The hazard is dust: cutting fiber cement releases crystalline silica, so cut outdoors with a dust-collecting blade or shears, wear an N95, and stand upwind. Prime every cut edge before installing, because raw edges absorb water. Budget $300–1,200 to hire it out, much of which is the trip charge and the paint match.
How often does fiber-cement siding need repainting?
Every 10–15 years for a field-applied finish, and 15–25 for boards that came prefinished from the plant. Paint is not cosmetic on this material; it is the water barrier that keeps the cement matrix from absorbing moisture at the surface and at every cut. Watch for chalking, a powdery residue on your hand after you rub the wall, and for fading on the sun-facing elevations. Staying on a repaint schedule is what carries the siding to the top of its 30–50 year range.
Is a crack in fiber cement urgent?
Not structurally, since the siding carries no load, but it is an open door for water. A hairline crack from settling can be filled with an exterior-grade elastomeric patch and painted over. A crack running the full width of a plank, or one you can see daylight through, means replacing the plank, because water behind the board wets the housewrap and the sheathing. Handle it before winter, since freeze-thaw widens any crack that has taken on water. One plank now beats a wall later.