Most Tacoma deck failures don’t start with the boards on top.
That’s the conclusion Daniel, the owner of Tacoma-based Decks Restore, has come to after spending more than a decade pulling apart failed decks across Pierce County. About 70% of the decks his crew tears out fail for the same three reasons, he says, and almost none of those reasons involve the surface boards homeowners can actually see.
“You’ll get a homeowner who paid $35,000 to a builder seven years ago,” Daniel said. “The deck looks fine from the kitchen window. The railings feel solid. Then we lift one section and the joist hangers crumble in our hands like rusted bottle caps. The structure underneath is at maybe 40% of its original strength.”
For South Sound homeowners weighing a new deck build or trying to assess one they already own, here are the three failure modes Decks Restore says it sees most often, and what to ask any contractor before signing a contract.
Failure mode 1: Hardware that wasn’t rated for the air it was breathing
Tacoma sits on saltwater. Puget Sound air carries chloride ions, and chloride ions eat metal faster than most homeowners expect.
A galvanized joist hanger inland, in a city like Puyallup or Auburn, can last 30 years. The same hanger 800 feet from the water at Browns Point or Salmon Beach starts failing in 8 to 12, according to Daniel. The zinc coating on galvanized hardware is sacrificial. It’s designed to corrode first to protect the steel underneath. Salt air burns through that zinc faster than the manufacturer planned for.
The fix, he says, isn’t complicated. It’s stainless steel 316, the marine-rated grade, used for every piece of hardware below the boards. Fasteners. Joist hangers. Post bases. Ledger lag bolts. The cost difference on a typical waterfront deck build runs between $400 and $900 — meaningful, but a small fraction of a project that costs tens of thousands.
The catch: most builders don’t quote 316 unless the homeowner specifically asks. Some quote 304 stainless and call it good, which is better than galvanized but still pits in chloride exposure over 15 to 20 years. Some quote galvanized and tell the homeowner it’ll be fine, which it won’t be on the waterfront.
Decks Restore published a longer breakdown of the hardware grades that survive Puget Sound conditions for homeowners who want the technical specifics. The short version, Daniel says: if you live within a mile of the water and your builder isn’t volunteering the words “316 stainless” without you prompting them, get another quote.
Failure mode 2: Footings dug for someone else’s soil
Tacoma sits on glacial clay. The clay holds water through the wet half of the year and shrinks through the dry half. Over five seasons, a footing dug to the wrong depth or set without proper drainage will heave in winter and settle in summer. The deck twists. Railings pull away from the house. Stairs separate from the deck frame.
“I’ve seen this on decks built by reputable companies,” Daniel said. “The crews knew how to frame. They didn’t know Tacoma soil.”
What works in Pierce County, according to Decks Restore: footings dug below the local frost line, which is 18 to 24 inches in most of Pierce County, deeper if the property is up the bluff in Browns Point or Dash Point. At least 6 inches of compacted gravel underneath the concrete for drainage. Engineered post bases tying the post to the footing, not toenailed 2x6s.
There’s nothing exotic about any of that. The work just has to be done, and on a hot July build with a crew on a deadline, it’s the first corner that gets cut.
For homeowners getting quotes on a Tacoma deck, Daniel recommends asking for footing specifics in writing. If the proposal says “concrete piers” without specifying depth, diameter, and base prep, ask for the details before signing. A builder who can’t tell a homeowner what’s going underground isn’t paying attention to the part that matters most.
Failure mode 3: Water getting in where the deck meets the house
The ledger board is the piece of lumber that bolts to the side of a house and carries one entire end of the deck. According to Decks Restore, it’s also the single most common point of catastrophic failure they see in Tacoma. Not because of the board itself, but because of what’s behind it.
A properly attached ledger has flashing — either a piece of metal or a rubberized membrane — that directs water away from the house siding and out over the front of the ledger. When that flashing is missing, or installed wrong, water from every rainstorm runs behind the ledger, soaks into the rim joist of the house, and rots the structure from the inside.
By the time a homeowner notices, the damage isn’t on the deck. It’s in the wall behind the deck.
“We’ve found rim joists chewed away to dust, sheathing soft enough to put a thumb through,” Daniel said. “In two cases, mold growing inside the wall cavity behind a child’s bedroom. The repair bill jumps from rebuild the deck to rebuild part of the house.”
Tacoma gets 38 inches of rain a year. The wet season is six months long. Any deck attached to a house in this climate without proper flashing will leak. It’s just a question of when the homeowner finds out.
One thing has changed for the better: the city of Tacoma now inspects ledger flashing on permitted decks. Builders who pull permits get checked. Builders who don’t pull permits don’t, which is part of why so many of the unpermitted decks Decks Restore is called to evaluate have this exact failure.
What’s changed in Tacoma deck building since 2014
A few things, for the better.
Composite materials have gotten more durable. Trex Transcend in 2014 was a different product than Trex Transcend today — the polymer cap is more UV-stable, the boards move less with temperature, and warranties have lengthened from 25 years to 50 on some lines.
The city of Tacoma tightened residential deck code around lateral load requirements after some high-profile deck collapses elsewhere in the country. Decks attached to houses now need additional hardware called hold-down anchors that weren’t standard before. Decks built before 2018 almost certainly don’t have them.
The Shoreline Master Program got more demanding. Properties within 200 feet of the ordinary high water mark — Old Town, Ruston, parts of Salmon Beach — now require a Shoreline Substantial Development Permit for most deck projects. The permit takes 60 to 120 days to process, which often catches homeowners off guard.
Material innovation has been the biggest change for homeowners. Cellular PVC was barely a residential option in 2014. Now, Daniel says, it’s the right answer for most waterfront Tacoma decks where the homeowner wants 30+ years of low maintenance.
Five questions to ask any Tacoma deck builder before signing
Daniel offered five questions homeowners can use to vet a contractor:
What hardware grade do you spec for waterfront jobs? You want to hear “316 stainless.”
What’s your footing detail for clay soils? You want depth, gravel base, and engineered post bases.
How do you flash a ledger? You want either Z-flashing or a rubberized membrane like Vycor. If they shrug, walk away.
Will you pull the permit, or are you asking me to pull it? If they’re asking the homeowner to pull it, that’s a builder who doesn’t want their work inspected.
Can you show me three completed Tacoma-area decks from the last 12 months and connect me with one of those homeowners? If they can’t, the homeowner isn’t hiring a deck builder. They’re hiring someone who calls themselves one.
Decks Restore has published a longer list of vetting questions on its Tacoma deck builders page for homeowners who want a more thorough checklist.
One thing every Tacoma homeowner can do this spring
Even homeowners with no plans to build or rebuild can benefit from doing this once a year, according to Decks Restore.
Pull a ladder up to where the deck attaches to the house. Look at the seam where the deck ledger meets the siding. Rust streaks running down the siding below the deck mean water has been getting behind the ledger for a while. If daylight is visible at that seam, or the boards near it feel soft, the rim joist behind it may already be compromised.
Catching this in year three is usually a $500 repair. Catching it in year ten can be a $30,000 one.
That 10-minute check, once every spring, will save more Tacoma homeowners more money than every contractor’s marketing budget combined.
Decks Restore is a deck construction and restoration company based at 748 Market St #173, Tacoma, WA. Daniel, the company’s owner, has built and rebuilt decks across Pierce County for more than a decade.
