Re-Coat, Tile or Rebuild: What to Do With a Failing Deck?
The same symptoms, cracked coating and a stain on the ceiling below, can mean a one-day re-coat or a deck opened to the joists. Here is how to tell which one you have, what each option involves, and where tile fits in.
Re-coat when a test section shows the existing system bonded and dry over sound plywood and flashing, and only the wear surface is worn. Tear off and re-waterproof when the coating has failed, the plywood is soft, the flashing was never right or there is a stain below. Rebuild when the joists, ledger or posts have rotted past repair. Tile is a finish, not waterproofing; it belongs on a deck only over a proper membrane. A re-coat over wet framing is the same job done twice, and the second time costs more. The decision is made by opening a test section at the free inspection, not by looking at the surface.
Right Image Builders (CSLB #1021284, licensed and insured) does all four across Los Angeles under one permit: the test section, the framing repair, the membrane and the finish, with the permit closed and a written workmanship warranty.
Start with what the symptoms mean
A deck tells you where it is failing before it tells you how badly. Chalky, faded or hairline-cracked coating with no stain below is usually a worn wear surface over a membrane that still works. Blisters, peeling sheets, a soft or spongy spot, or a stain on the ceiling below mean water has been under the membrane for a while, and the plywood is involved. A deck that bounces, a railing post that moves, a ledger with a dark line where it meets the wall mean the framing is involved. The symptom narrows the option; the test section decides it.
Re-coat vs. tear-off vs. tile vs. rebuild at a glance
| Re-coat | Tear-off and re-waterproof | Tile over membrane | Rebuild | |
|---|---|---|---|---|
| When it is the right call | Existing system bonded, dry, plywood firm, flashing sound; wear surface worn or faded | Coating failed, plywood soft, flashing wrong or missing, stain below, ponding corner | You want a tile finish on a deck that is being re-waterproofed anyway; the deck can carry the weight | Joists, ledger or posts rotted beyond sistering; deck sagging; structure under-built for its span |
| What comes off | Nothing; surface cleaned and keyed | Coating, failed plywood, bad flashing; sometimes a joist or two | Old tile, mortar and any old membrane; same as a tear-off underneath | The deck, down to the framing or the posts |
| Permit | Usually none for a like-for-like wear coat; confirm with LADBS or the city | Yes: permitted work, framing repairs inspected under the same permit | Yes | Yes, with engineering where the structure changes |
| Time on site | A day or two plus cure | Days for a single deck plus cure between coats | A week or more: membrane, cure, mortar bed, tile, grout | Weeks, with engineering and inspections |
| Warranty | Short; it inherits the age of the system underneath | Manufacturer product warranty where offered, plus the workmanship warranty | Membrane warranty as above; tile and grout are maintenance items | As a new deck |
| Risk if chosen wrongly | Hides wet framing; the second job is bigger | Low: this is the default for a failed deck | Tile over a bad membrane is the most expensive leak to find | None; it is the last resort |
| Typical Los Angeles case | A 10-year-old coated deck with no leaks, due for a wear coat | The 1970s balcony with a 20-year-old coating and a stain in the unit below | A patio-style deck over a garage that the owner wants in porcelain | A hillside deck with a rotted ledger and soft posts |
Re-coat: when the surface is the only problem
Every fluid-applied deck system has a wear coat on top of the waterproofing layers, and the wear coat is meant to be renewed. If a test section shows the system still bonded to the plywood, the plywood firm and dry, the flashing intact and no stains below, a re-coat restores the surface and the slip resistance and adds years. The manufacturer specifies the prep and the compatible top coat; using a different brand's product over an unknown system is where re-coats go wrong.
What a re-coat cannot do is fix anything under it. A re-coat over a lifted membrane, a wet ply or a missing flashing seals the water in, and the deck fails again from underneath, usually within a season or two.
Tear-off and re-waterproof: the default for a failed deck
When the coating has blistered or peeled, when a corner ponds, when there is a stain below or a soft spot underfoot, the system has failed and the deck comes down to the plywood. The failed sheathing is replaced, a joist or ledger section is sistered where the rot has reached it, the slope is corrected, every door threshold, wall, post and edge is flashed and counter-flashed, and a new ICC-ES-evaluated system goes on from the primer to the wear coat, to the manufacturer's written specification. This is the job most Los Angeles decks over fifteen years old actually need, and it is the one our deck and balcony waterproofing pages describe layer by layer.
Tile: a finish that needs a membrane under it
Tile is not waterproofing. Grout is porous, tile cracks, and every tile deck that leaks in Los Angeles leaks through the grout into whatever is beneath. Tile belongs on a deck only over a proper waterproofing membrane with the slope, the flashing and the drains built into the membrane layer, and only on a structure that can carry the added weight of a mortar bed and porcelain. Done that way it is a durable, handsome finish. Done the old way, tile set on a mortar bed directly over plywood, it is the most expensive leak to find, because the whole assembly comes off to reach it. The job-anatomy guide shows where the tile sits in the stack.
Rebuild: when the structure is gone
Sistering a joist or replacing a ledger section is normal repair. When most of the joists are soft, the ledger has rotted along its length, the posts are rotten at the base or the deck was never built for its span, the deck is rebuilt: new framing, new sheathing, then the waterproofing. On hillside decks that often means an engineer, and on any deck it means a full permit. It is the last resort, and it is also the only honest answer when the test section finds nothing left to fasten to.
How we decide, and why we open a test section first
We do not quote decks from the driveway. The free inspection walks the deck, checks the ceiling below and the thresholds, and opens a test section of the old coating where the signs point. What we find there, firm or soft, dry or wet, flashed or not, is what you get in the written scope: re-coat, tear-off, tile over a new membrane, or rebuild, with the permit and the inspections listed. Anything more that the tear-off finds is photographed and priced in writing before the crew continues.
Sources (checked October 2026): ICC-ES evaluation reports for pedestrian traffic coating systems over plywood and concrete (for example ESR-2201 Westcoat ALX, ESR-2097 Pli-Dek, ESR-1757 Dex-O-Tex Weatherwear), including Class A roof-covering classification and installation conditions; Los Angeles Department of Building and Safety, plan check and permit information; Right Image Builders service and neighborhood pages (2026 planning ranges, timelines, permit authorities). Cost figures are Right Image Builders' 2026 planning ranges from its service and neighborhood pages.
Read before you hire anyone.
Plain answers on costs, permits, materials and hiring, written for Los Angeles houses and kept current.
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Questions
Only if a test section shows the existing system bonded and dry over firm plywood with sound flashing, and there is no stain below. Then a manufacturer-compatible wear coat restores the surface. If the coating is peeling, a corner ponds or there is a stain on the ceiling under the deck, a re-coat seals water in and the deck fails again from underneath.
Soft or spongy spots underfoot, a deck that bounces, blisters that move when pressed, and any stain or drip on the ceiling below are the usual signs. The only certain way is to open a test section at the suspect area, which is what the free inspection does.
As a finish over a proper waterproofing membrane, on a structure that can carry the weight, yes. As the waterproofing itself, no: grout and tile let water through, and a tile deck set straight on plywood is the most expensive kind to repair because the whole assembly comes off.
A like-for-like wear coat usually does not need one; replacing the waterproofing system, repairing plywood, framing or flashing does, through LADBS inside the City of Los Angeles or through the city building department elsewhere. We tell you which case you are in at the inspection.
The structure and membrane, installed to the manufacturer's specification over sound flashing, last many years in the Los Angeles climate; the wear coat is renewed on the manufacturer's schedule. What shortens the life is water getting behind the membrane at a door, wall or post, which is why the flashing matters more than the brand.
Then we say so in writing, with the photos, and price the rebuild: new framing and sheathing, engineering where the structure needs it, the waterproofing system, the permit and the inspections. A deck with a rotted ledger and soft posts is not a candidate for any coating.
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Find Out
Which One You Have
Free on-site inspection across Los Angeles: the ceiling below checked, a test section opened, and a written scope that says re-coat, tear-off, tile or rebuild, with the permit listed.
(818) 210-4544