Late March, a homeowner off Richmond Road called us out to look at a deck that was not ours. Pressure treated boards, maybe twelve years old, coated the previous June with a solid product by somebody else.
Through the summer it had looked exactly like what she paid for. Then the winter went through it.
What she had in March was not fading. It was sheeting. Whole strips lifting off the walking boards along the grain, curling at the ends, with the rail caps mostly intact and the vertical balusters almost untouched.
That pattern is the diagnosis, and we told her so on the front steps before we got a meter out.
Here is the reframe that matters. Winter did not cause this. Winter revealed it.
The short answer: why it peeled in the first spring
Almost always, moisture trapped under a film that was applied before the wood was dry enough. Freeze-thaw cycling then breaks the bond from underneath, one cycle at a time, all winter. The peeling pattern tells you which cause hit your deck, and recoating over it without addressing the moisture will fail the same way.
Read the failure pattern before you buy anything.
Check the wood’s moisture content with a pin type meter.
Read your warranty for its exclusions before you call the contractor.
Do not recoat over peeling material.
If you want somebody to look at it and tell you which of the five causes it was, we do that for free. Call (859) 695-2718.
Why the spring after is when it shows up
People blame the winter because that is when they see it. The winter was the test, not the cause.
What freeze-thaw actually does
Water expands roughly 9 percent when it freezes.
If there is moisture under a film, every freeze pushes that film upward from beneath. Every thaw lets it settle. A deck surface can run through 60 to 80 freeze-thaw cycles across a single November to April season.
Sixty to eighty small pushes against a bond that was already compromised. The film does not fail on one cold night. It fails by attrition, and in March you find the result.
Why Kentucky winters are harder on coatings than colder ones
This surprises people who assume a mild winter is a gentle one.
Lexington averages roughly 90 to 95 days a year at or below freezing, with recorded years running from 67 to 120. More importantly, the Ohio Valley pattern swings across the freezing line repeatedly rather than staying hard frozen.
A place that freezes in December and stays frozen until March gets one long cycle. Fayette County gets dozens. Cycle count is what breaks coatings, not absolute cold, which is why a Bluegrass winter can be rougher on a deck than a northern one.
The five reasons a finish fails in one season
Each of these leaves a different signature.
The wood was too wet when it was coated
The most common cause by a wide margin.
Most manufacturers want moisture content at or below 12 to 15 percent before application. Normal exterior wood sits between 9 and 15 percent. Above the fiber saturation point of roughly 30 to 33 percent, the cell walls are fully saturated and any film applied over it is finished before it starts.
Two timing rules follow from that. A washed deck commonly needs 3 to 5 days of dry weather before coating, not a weekend. And new pressure treated wood typically needs 3 to 12 months of seasoning before it will accept a finish at all.
Washing on Saturday and coating on Sunday is the single most common shortcut in this trade.
Prep was skipped or rushed
Mill glaze on newer boards, residue from an old coating, mildew and ordinary dirt all prevent a bond.
None of it is visible from six feet away once the new product is on. All of it shows on the underside of a flake a year later.
The wrong kind of product for a horizontal surface
Film formers sit on top of the wood rather than penetrating into it.
Wood moves seasonally, swelling and shrinking with moisture. A rigid film cannot follow that movement, so it cracks, and once it cracks water gets under it. On a horizontal surface that process takes one to two seasons.
Film build was wrong
Both directions cause failure.
Too thin and there is nothing there to weather, so it wears through in a season. Too heavy and the film cannot breathe, which traps moisture underneath. Even semi-transparent stains will peel if over-applied without letting the first application weather in between.
Application conditions were outside spec
Dew forming overnight on an uncured film. Temperature falling below the product minimum during cure. Rain arriving inside the manufacturer’s window.
Any of those produce a film that looks correct on day two and has no real bond at all. High humidity during application causes the same problem on siding, and the mechanism is identical.
How to work out which one hit your deck
Twenty minutes and a torch. Work through these in order.
Is it lifting in sheets, or wearing thin? Sheets mean adhesion failure. Thin means abrasion, which is normal wear.
Is the peeling on the walking boards while the rails are intact? That is horizontal water and traffic stress, which points at moisture and film choice.
Is it worse at board ends and around fasteners? End grain absorbs many times more water than face grain, so failure there means water was getting in.
Does the underside of a lifted flake look clean or dirty? Clean means it bonded and was broken. Dirty means it never bonded at all, which is a prep failure.
Does a moisture meter read high in shaded sections during dry weather? That means water is getting in and not getting out.
Are the boards cupping? That is a wood problem, not only a coating problem, and it changes your options.
That fourth question is the one most people never ask, and it settles more arguments than the other five combined.
Why a deck is not just a sideways wall
Homeowners reasonably wonder why the siding is fine and the deck is not.
A vertical wall sheds water in seconds. Rain hits it and runs off.
A deck holds water. In puddles after rain, in the grain, at every end cut, in the gaps between boards, and under the planter you have not moved since last summer.
Add full overhead UV with no eave protecting it, and foot traffic abrasion that no siding ever experiences. A deck surface takes more punishment in one year than a wall takes in five.
So a coating that genuinely performs for years on siding can still fail in one season underfoot. That is not necessarily a bad product. It is often the wrong surface for it.
What your warranty probably does not cover
Read the exclusions first and the number of years second. The years are marketing. The exclusions are the contract.
Most multi-year coating warranties hinge on the phrase “properly prepared surface.” That is the clause that decides everything, and the person who decides whether the surface was properly prepared is generally the person who prepared it.
Fading and normal wear are almost always excluded. Foot traffic is frequently written in as an explicit limitation on horizontal surfaces.
That is what we told the homeowner off Richmond Road when she asked whether the contractor would fix it. Read the warranty first, because the answer is usually already written there.
What to ask the original contractor, in order
Four questions, and the answers usually settle it:
What were the moisture readings before application, and where were they taken?
What date was the deck washed, and what date was it coated?
What was the product, and can I see the data sheet?
How many coats went down?
If nobody recorded a moisture reading, you have your answer to question one by the absence of an answer.
Your three real options now
None of them is painless. Here they are honestly.
| Option | Cost | How long it lasts | When it makes sense |
| Recoat over it | Lowest | Shortest, often a single season | Only on a deck you plan to replace soon |
| Strip back and refinish correctly | Labour heavy | Full service life if done properly | Sound boards, no rot, no significant cupping |
| Replace affected boards or the deck | Highest | Resets everything | Rot, cupping or boards past saving |
Two honest notes.
Recoating over peeling material is the option most people want and the one that works worst. The new film bonds to the failing old film, and it takes the old film with it when it goes.
Stripping is not a clean process. Residue stays in the cracks between boards and in the checking on the board faces, no matter how thorough the work is. Anyone promising a perfectly bare deck after a strip is overselling it.
And a third thing worth saying plainly: some decks are past coating. If the boards are cupped, soft or splitting, the right advice is repair or replacement, not another finish. We would rather tell you that than sell you a coating that fails again next March.
What good looks like the second time
The standards to hold anybody to, including us.
Wash, then wait for measured dryness, not a calendar date. Days of dry weather are a guideline. A meter reading is a fact.
Meter in several places and average the readings. Use a pin type meter, take readings on shaded boards and sunny ones, near ends and mid span. One reading from one board proves nothing.
Prep to bare, sound substrate. Remove mill glaze, old residue, mildew and dirt. Sand where the product calls for it.
Apply inside the product’s stated temperature and dew point window. Not the forecast for the county, the conditions on the deck.
Two coats, applied as the product specifies, including back-brushing where the data sheet calls for it.
If a contractor will not tell you the moisture reading before they start, that is your answer about how the rest of the job will go.
A worked example: the Richmond Road deck in March
What the peeling pattern showed before any tools came out
Sheeting on the walking boards, along the grain, curling at the board ends. Rail caps mostly intact. Vertical balusters almost untouched.
Horizontal surfaces failing while vertical ones survive is water, not product age and not UV.
The meter readings and what they meant in late March
We put a pin meter into the boards in three places. The wood was still carrying moisture in late March, on a deck that gets sun until early afternoon.
That is not a deck that dries. That is a deck holding water in the structure.
Working backwards to the June application
The deck had been coated the previous June within a few days of a wash. Not long enough in Kentucky, where humidity slows drying considerably even in a warm week.
The film had gone down over water. Then every night below freezing after that, the water underneath expanded and pushed. It did that all winter. In March the film finally let go.
What the warranty actually said
Properly prepared surface. Fading and wear excluded. Foot traffic limitation on horizontal applications.
There was no recorded moisture reading to establish that the surface had been properly prepared, and no record of the drying interval between the wash and the coating.
What we recommended, and what she chose
We laid out the same three options in the table above and told her the boards themselves were sound, which put strip and refinish on the table as a real choice rather than a temporary one.
For context on us rather than on the deck, we hold 4.9 stars from 51 reviews across the company, and 4.2 stars from 9 local reviews on our Lexington profile.
If you want an independent read on a deck somebody else coated, we will come out and look. Free, and we will tell you if it is past coating. (859) 695-2718.
The question nobody asks after a deck fails
One thing worth raising, briefly.
If a crew coated your deck over wet wood without a moisture reading, ask what approach the same crew took on the siding. The mechanism is the same, the timeline is just slower, because a wall sheds water and a deck holds it.
Siding failure from the same shortcut does not show up in nine months. It shows up in year three or four, which is why nobody connects it back.
Worth knowing about the alternative on the house itself: our exterior coating is spray applied at roughly 80 percent solids with ceramic microspheres, 8 to 10 times the thickness of paint, and carries a 25 year transferable warranty, against traditional paint at 5 to 7 years. That warranty covers the house exterior and does not extend to a deck, which is a separate surface with separate terms.
If the deck was the warning, the siding is the question worth asking next.
Frequently asked questions
Why is my deck peeling after only one year? Usually because the wood was too wet when it was coated. Moisture trapped under a film expands about 9 percent each time it freezes, and a deck can go through 60 to 80 freeze-thaw cycles in one winter. Skipped prep, a film-forming product on a horizontal surface, and wrong film build are the other common causes.
Can you just recoat over peeling deck stain? You can, and it will fail faster than the first one did. New coating bonds to the failing old film rather than to the wood, so when the old film lets go it takes the new one with it. Recoating is only defensible on a deck you intend to replace within a year or two.
What moisture content should the wood be before coating? At or below 12 to 15 percent for most products. Normal exterior wood sits between 9 and 15 percent, and above the fiber saturation point of roughly 30 to 33 percent no film will hold. Check with a pin type meter in several places, including shaded boards, and average the readings rather than trusting one spot.
How long after pressure washing can a deck be coated? Commonly 3 to 5 days of dry weather, though the honest answer is when the meter says so rather than when the calendar does. Kentucky humidity extends that. New pressure treated wood is different again and typically needs 3 to 12 months of seasoning before it will accept a finish at all.
Is peeling covered by a deck coating warranty? Often not. Most warranties are conditioned on a properly prepared surface, exclude fading and normal wear, and frequently limit coverage on horizontal foot traffic surfaces. Read the exclusion list before the number of years. Ask for the pre-application moisture readings, since their absence is relevant to whether the surface was properly prepared.
Why did the rails survive when the floor boards peeled? Because vertical surfaces shed water in seconds and horizontal ones hold it. Walking boards collect standing water, absorb it through end grain and gaps, take full overhead UV with no eave protection, and get foot traffic abrasion. That combination is far harsher than anything a rail cap or baluster experiences.
Does freeze-thaw damage decks in Kentucky? Yes, and arguably more than in colder states. Lexington averages roughly 90 to 95 days a year at or below freezing, and the Ohio Valley pattern crosses the freezing line repeatedly instead of staying hard frozen. Cycle count breaks coatings, not absolute cold, so a mild swinging winter can be rougher than a steady cold one.
How much does it cost to strip and redo a deck? It depends on square footage, how much old coating has to come off, board condition, railing complexity and whether any boards need replacing. Stripping is labour heavy and is usually the largest line item. Get the deck measured and get the scope written down by item, since a single lump figure hides where the money is going.
Should I replace the boards instead of recoating? If the boards are cupping, soft underfoot, splitting or showing rot, yes. A coating on a failing board buys appearance for a season and hides the problem. If the structure and boards are sound and the failure was adhesion only, stripping and refinishing correctly is the better value. Have somebody assess the boards before deciding.
Get an honest look at it before you pay twice
If you paid for a deck finish last year and you are looking at it lifting this March, the first thing worth having is a diagnosis rather than a quote.
We will come out, read the failure pattern, take moisture readings, and tell you which of the five causes it was. If the deck is past coating, we will tell you that too, even though it is not the answer that sells anything.
While we are there we will also walk the house exterior, because the same shortcut on siding takes longer to show and costs considerably more when it does.
Rhino Shield of Cincinnati and Kentucky, 222 Midland Ave #6109, Lexington, KY 40508. Call (859) 695-2718, Monday to Saturday, 9:00 AM to 7:00 PM. We cover Lexington and Fayette County along with Nicholasville, Georgetown, Versailles and Richmond.
A deck coating does not fail in March. It fails on the day it goes down, and March is simply when you find out.
