The homeowner met us with three replacement quotes already in hand and one question she could not get anyone to answer.
Her siding was doing what forty-year-old hardboard does. The bottom courses had swelled and gone soft at the edges, thickened like a sponge left in a sink. Around the nail lines, the faces were flaking off in thin layers. From the street the house looked fine. From two feet away it looked finished.
Every quote said the same thing: take it all off, start again, five figures.
Her question was simple. Is there really nothing between patching this myself and spending twenty thousand dollars?
So we walked the wall with her, board by board, and counted.
Six boards were genuinely dead. Swollen through, delaminating, no structure left. Those were coming off no matter who she hired.
The rest of that wall, the large majority of it, was firm. Sound board that had been drinking water for decades because whatever finish it once had gave up a long time ago.
That distinction is the entire article. Hardboard that stops absorbing water stops dying.
The Short Answer
Masonite hardboard siding fails by absorbing water. It has been off the market for over two decades, so replacement boards cannot be matched forever.
Boards that are mushroomed, delaminating or rotted must be replaced. Boards that are still structurally sound can usually be saved by stopping the absorption. The class action claims window closed years ago, so whatever you decide, the cost is now yours.
That is why it is worth knowing all three options rather than just the two most contractors present. Our free exterior assessment is built around exactly that board-by-board count.
What Masonite Is, and How to Confirm You Have It
The name gets used loosely. People say Masonite the way they say Kleenex, meaning any hardboard siding regardless of who made it.
Hardboard siding is wood fiber and resin, compressed under heat and pressure into board. It is not solid wood and it is not fiber cement. That manufacturing process is exactly why it fails the way it does: the fibers that give it strength are also what draw in water.
To confirm what you have, check these:
- Embossed wood grain. The grain pattern repeats identically down the length of the board, because it was pressed in rather than grown.
- The back of the board. Where you can see one, hardboard shows a smooth or lightly textured back with no wood grain structure.
- The bottom edges. Hardboard fails at the bottom of each course first, swelling and thickening rather than cracking.
- The era of the house. Hardboard was a dominant budget siding through the 1980s and 1990s.
- Weight and sound. It is lighter than fiber cement and sounds duller than solid wood when tapped.
If your house went up in that window and the bottom courses are thickened and flaking, you very likely have hardboard.
The Lawsuit, the Settlement, and Why No Check Is Coming
A lot of people arrive at this topic hoping there is money attached. Here is the accurate version, because you deserve the real dates rather than a vague reference to a lawsuit.
Hardboard was developed in the 1920s and became one of the most widely used siding products in the country during the 1980s and 1990s. Complaints about premature moisture failure followed.
The class was certified in November 1995. A month-long jury trial in 1996 found the product defective, and in 1998 the court approved a settlement covering roughly four million homeowners. Siding installed between January 1, 1980 and January 15, 1998 fell within it. The claims program ran through 2008, and total cash paid to homeowners exceeded one billion dollars.
That last sentence is the important one. The program ended in 2008. Masonite exited the hardboard siding business in the early 2000s, and the settlement machinery wound up long ago.
So there is no claim to file today. If you bought your house after those years, the previous owner may have already claimed on that siding, and either way the money is gone.
We say this plainly because the alternative is worse: people put off dealing with failing siding for a year or two while chasing a claim that closed before some of their kids were born. Nobody is paying for this but you, which means the decision deserves real numbers rather than hope.
No, It Does Not Contain Asbestos
This question comes up on almost every hardboard assessment, usually quietly, usually near the end.
Hardboard siding is wood fiber and resin. It does not contain asbestos.
Homes of this era can contain asbestos in other materials, so if you are planning demolition work it is worth knowing your house. But the siding itself is not the concern people fear it is.
Why It Crumbles: The Water Absorption Cycle
The failure follows the same sequence on every house.
It starts at the edges. Bottom edges, cut ends, and any place the factory seal was broken by a saw or a nail. Those exposed fibers wick moisture.
Absorbed water swells the board. Swelling stresses the resin bonds holding the fibers together, and once those bonds break, the board loses its ability to shed water at all. Now it absorbs faster. The face begins to delaminate in thin layers, which is the flaking you see around nail lines, the same kind of surface failure covered on our paint flaking page.
Kentucky winters accelerate every step. Water inside the board expands roughly 9 percent when it freezes, prying the fibers apart from the inside. Our temperatures cross freezing repeatedly rather than staying cold, so a saturated board can go through that many times in one season.
That is why bottom courses go first, why damage clusters under drip lines and downspouts, and why the shaded north side is usually worse than the sunny south side, a pattern related to the mildew growth we see on the same shaded walls.
Board by Board: The Damage Stage Triage
Here is the framework we use on assessments. Take a walk with a screwdriver and sort your wall into these four groups.
| Stage | What you see and feel | Verdict |
| 1. Cosmetic | Paint failing, chalking or peeling. Board still firm, edges crisp | Saveable |
| 2. Early swelling | Bottom edges thickened, slight roughness, but board firm when probed | Saveable if sealed soon |
| 3. Mushrooming and delamination | Edges bulbous and soft, faces flaking in layers, screwdriver sinks in | Replace the board |
| 4. Rot into sheathing | Probe passes through and finds soft material behind | Open the wall |
Stage 1: Cosmetic
Paint has failed but the board underneath is intact. This is the best possible position to be in, and it is where most of these houses could have stayed if the finish had been maintained, the same story we tell on our page about faded, chalking paint.
Stage 2: Early Swelling
Edges have thickened but the board still has structure. This stage is a genuine fork in the road: sealed properly now, these boards keep serving. Left another few winters, they are stage 3.
Stage 3: Mushrooming and Delamination
The board is finished. Fibers have separated, the resin bond has failed, and nothing applied to the surface will restore structure that is no longer there.
These boards come off. Any contractor who offers to coat over them is either not looking closely or not being straight with you.
Stage 4: Rot Into Sheathing
Water has passed the siding and reached what is behind it. That is a bigger repair and it needs opening up rather than guessing. Our page on wood rot repair covers what that involves.
What a Typical Era-Built Wall Actually Looks Like
Here is the pattern that surprises people, and it is why we walk walls before quoting.
On most of these homes, the dead boards are a minority and they are concentrated in predictable places. Bottom courses. Under downspouts and gutter seams. Around windows where the caulk failed. Shaded elevations that never dry out.
Everything else is usually stage 1 or stage 2. Firm board, ruined finish, actively absorbing water.
That ratio is the reason we think a great many of these walls are being replaced when they did not have to be. That is an opinion formed on ladders rather than a laboratory finding, and a homeowner is entitled to weigh it against three replacement quotes. But it is a consistent enough pattern that it is worth getting a second look before signing.
Your Three Options, and What They Cost
| Option | Typical cost | What happens next |
| Patch and repaint | Repair $1.50 to $5.00 per sq ft, plus repaint every 5 to 7 years | Absorption continues between repaints |
| Full replacement | $10,000 to $20,000 typical whole house, $4 to $8 per sq ft installed, plus $0.70 to $2.00 per sq ft tear-off | New material, new warranty, largest bill |
| Replace failed boards, then seal the wall | Board replacement plus a one-time coating | Absorption stops on the boards you keep |
Cost figures from HomeGuide.
Patch and Repaint
The cheapest thing to do today and the most expensive thing to keep doing.
Standard paint on hardboard is a thin film over a material that wants to drink. It holds for five to seven years, then opens up, and absorption resumes. Every cycle, a few more stage 2 boards become stage 3, the same repaint-and-fail loop covered on our bubbling paint page.
Full Replacement
Sometimes the right answer. If most of your wall is at stage 3, or rot has reached the sheathing across a broad area, replacement stops being avoidable. Removal alone typically runs $0.70 to $2.00 per square foot before any new material goes up.
It is also the option every replacement contractor is incentivized to recommend, which is worth remembering when all three quotes say the same thing.
The Middle Path
Replace the boards that are genuinely gone. Then seal what remains, thoroughly enough that it stops absorbing water.
This is the option missing from almost everything written about hardboard siding, and it is the one that matches the actual failure mechanism. Hardboard does not fail because it is hardboard. It fails because it absorbs water. Remove the absorption and you remove the failure.
What that requires is more than paint. It needs a film thick enough to stay continuous over faces, edges and joints for decades, and it needs to be applied to every exposed surface rather than just the flat face.
Rhino Shield is a ceramic coating rather than a paint. It goes on spray applied at 8 to 10 times the thickness of standard paint, with roughly 80 percent solid content, and it stays breathable so moisture already in the wall can escape rather than being sealed in. It carries a 25-year transferable warranty.
The honest limits, stated once and clearly. Coating goes on sound board. Stage 3 and stage 4 boards get replaced first, every time. And no coating makes hardboard into something it is not. What it does is stop the water absorption that is killing the boards you still have. Individual board replacement costs, along with general siding repair pricing, are covered on HomeGuide’s siding repair guide if you want the wider comparison.
If your house has other siding types too, our exterior coating services page covers what we work on, including vinyl and aluminum.
Hardboard Homes in the Louisville Area
The timing here is not coincidental.
Hardboard’s peak years, roughly the 1980s through the 1990s, line up directly with a major growth period in Louisville’s suburban ring. A great many homes built in that window went up with hardboard because it was the affordable choice at the time, and because nobody yet knew how it would age.
Our climate then supplied the worst possible test. Humid summers keep the material damp, and winters that cross the freezing line repeatedly do the prying. Hardboard in a dry western climate has aged far better than hardboard here, and that is not a coincidence either. It is the same climate story behind the woodpecker damage we see on cedar siding across the same neighborhoods.
The result is a large population of homes hitting thirty to forty years old at exactly the moment their siding demands a decision. Our crews work across Louisville, Lexington and Cincinnati, and these houses come up constantly.
Frequently Asked Questions
Is Masonite siding still made? No. Masonite exited the hardboard siding business in the early 2000s. Modern equivalents like engineered wood and fiber cement products are different materials with different moisture performance.
Can I still file a Masonite lawsuit claim? No. The settlement was approved in 1998 and covered siding installed between January 1, 1980 and January 15, 1998. The claims program ran through 2008 and has been closed for many years.
Does Masonite siding contain asbestos? No. It is compressed wood fiber and resin. Other materials in homes of that era may contain asbestos, but the hardboard siding itself does not.
Can crumbling boards be repaired? Boards that are mushroomed or delaminating cannot be restored, because the fiber bonds have failed. Those get replaced. Boards that are still firm can be saved by sealing them properly.
How do I know if my siding is hardboard? Look for repeating embossed grain, swelling and thickening at the bottom edges rather than cracking, a house built in the 1980s or 1990s, and a lighter, duller feel than solid wood or fiber cement.
What does replacement cost? Roughly $10,000 to $20,000 for a typical whole house, or $4 to $8 per square foot installed, plus $0.70 to $2.00 per square foot for tear-off, per HomeGuide.
Can you seal or coat Masonite siding? Sound hardboard can be sealed with a thick, breathable coating that stops water absorption at the faces, edges and joints. Failed boards must be replaced first. Anyone offering to coat over swollen or delaminating board is skipping the part that matters. Our FAQ page has more on how that process works.
What should I replace dead boards with? For a handful of boards, matching hardboard replacements are sometimes still available through salvage or specialty suppliers. For larger areas, fiber cement or engineered wood are the common modern choices, and both can be finished to match the rest of the wall.
Before You Sign a Replacement Quote
If your wall is mostly stage 3, replacement is the honest answer and we will tell you so.
But if you have three quotes that all say tear it all off, it is worth having someone walk the wall and count. The number that matters is not how old the siding is. It is how many boards are actually dead.
We will do that count for free, mark the boards that need to go, and give you a straight comparison against the replacement quotes you already have. If the comparison favors replacement, you will have lost nothing but an hour. Learn more about our team, or ask about current specials when you call.
Get my free estimate or call (855) 744-6605, or contact us with questions. You can also read what homeowners say about how the work goes, or our general guide to exterior paint problems if issues elsewhere on the house need a look too, including water stains under windows after storms.
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