Fall Deck Maintenance: Getting a Deck Ready for Snow, Salt and Ice
What this comes down to
- Most winter damage to a deck comes from what sits on it or drains through it, not from the snow.
- A foot of heavy wet snow weighs about 21 pounds per square foot. A foot of dry powder weighs about 3.
- Rock salt is the cheapest ice melt and one of the most corrosive. The brine drips onto the steel below.
- Shovel composite with plastic, along the boards. A metal blade can scratch it, and scratches are not covered.
- Nearly a quarter of grill structure fires start on a balcony or open porch. Keep the grill off the rails.
- A loose railing or soft stair tread gets worse under ice. Fall is the last dry window to fix it.
Fall deck maintenance in Illinois is less about coatings than most lists suggest. What matters is how your deck spends the winter. That means what stays on it, how you clear it, and what melts the ice.
The whole house list covers taps, gutters and leaves. This one is only about the deck. The jobs run in the order they fall due, from leaf drop to the first real snow.
What should come off the deck before winter?
Anything that sits flat and holds water against the boards. Planters, rugs, doormats and storage boxes trap moisture under them for months. Wood stays wet there all winter, and composite can stain or discolor.
Rugs are the worst of them. A rubber-backed mat can discolor composite. On wood, a rug left out until April leaves a dark, soft rectangle. That patch is where rot starts.
If you do one thing this weekend, lift everything that sits flat on the boards. Water on the surface finds its way down to the joist tops, which is how joists start to rot unseen.
How much snow can a deck hold?
More than most homeowners fear, if the frame is sound. What counts is the kind of snow, not its depth. The Building America Solution Center is run for the Department of Energy. It sets out snow weight by type.
A foot of light, dry snow weighs about 3 pounds per square foot. A foot of heavy, wet snow weighs about 21. An inch of ice weighs about 5. Rain falling on old snow makes the pack heavier without making it deeper.
The same guidance says clearing snow from a deck is not usually necessary. The exceptions are older structures, anything built to doubtful standards, and an unusual buildup. Creaking, bowing or a sticking door are the signs.
The deck worth worrying about is the one that is already soft. A frame with rotted joist ends has lost capacity before the first flake falls. The guide to testing deck joists shows how to check.
Should I shovel my deck?
Yes, after heavy wet snow or before a thaw and refreeze. Always clear the stairs and the path to the door. Leave a thin layer rather than scraping bare, and push along the boards.
Use a plastic shovel. Trex says in its care and cleaning guide never to use a metal shovel on its decking. A shovel may scratch it, and that damage is not covered by the warranty.
On wood, a metal blade catches board edges and raised screw heads. Throw the snow clear of the stairs and away from the house wall. Otherwise it melts against the foundation.
Which ice melt is safe on a deck?
None is harmless, so use as little as you can. Trex allows calcium chloride or rock salt on its composite, rinsed off when practical. On a wood deck the bigger risk is to the steel in the frame, not the boards.
Iowa State University Extension compares the common deicing salts side by side. Rock salt works best above about 15 degrees and is highly corrosive. Calcium chloride works to minus 20 and corrodes metal too.
Everything that melts on a deck drains through the gaps. It lands on the hangers, the joist ends and the plants below. Salt in that water attacks galvanized fasteners and burns the shrubs. That is two repairs for one icy step.
The better answer on a deck is sand for grip and a shovel for the rest. The extension suggests about fifty pounds of sand to one pound of salt. Calcium magnesium acetate is gentler still, but costs many times more.
Can I keep using the grill on the deck in winter?
Yes, with the same clearances as summer, which snow makes easy to forget. The National Fire Protection Association publishes grilling safety guidance. It says to keep a grill well away from the house and railings.
It also finds that nearly a quarter of grill structure fires start on a balcony or open porch. In winter the grill creeps toward the door to stay out of the snow. That is exactly the wrong direction.
What should be fixed before the first freeze?
Anything loose that ice will make dangerous. A wobbly railing, a cracked tread or a handrail that turns in the hand is a nuisance in October. On an icy January morning it is how people fall.
Fall is also the last dry window for outdoor wood repairs. Fasteners bite, sealants cure and a probe gives an honest reading. The guide to a wobbly deck railing covers the usual causes.
What goes on a fall deck checklist?
The table puts the jobs in the order they fall due, with what each one prevents. None of them needs a coating, and most take under an hour on a typical DuPage deck.
| Task | When | Why it matters | Skip it and |
|---|---|---|---|
| Lift planters, rugs and mats | Before the leaves finish | Trapped water stains composite and rots wood | Dark, soft patches by spring |
| Clear board gaps and the ledger line | After the leaves drop | Debris holds water on the joist tops | Joist tops start to rot |
| Fix railings and stair treads | Before the first freeze | Ice turns a wobble into a fall | An injury risk all winter |
| Check hangers, posts and ledger from below | Before the first freeze | Rust and frost heave worsen through winter | A bigger repair in spring |
| Set out a plastic shovel and sand | Before the first snow | Metal blades and salt damage boards and steel | Scratched boards, corroded hangers |
| Move the grill clear of rails and eaves | Before the first snow | Winter grilling drifts toward the house | A fire risk at the door |
What cannot be judged from the top of the deck?
How much load the frame can still carry. Joist ends, ledger bolts and post bases sit out of sight. The boards look the same over sound wood and soft. Only a look underneath, with a probe, answers it.
And whether snow will slide onto the deck from the roof above. A roof that sheds onto a deck can drop a winter's load at once. It depends on roof pitch and surface, and it rarely shows until the first big storm.
Fall deck questions
When should I get my deck ready for winter?
Between leaf drop and the first hard freeze. The leaves need to be down so the board gaps only have to be cleared once. Repairs need dry wood and temperatures above freezing, so fasteners bite and sealants cure. In practice that is a weekend or two in late fall, watching the forecast.
How does Perfect Work check a deck before winter?
Perfect Work Remodeling & Repairs starts underneath. Posts, footings, hangers and the ledger are checked for movement, rust and soft wood. Railings and stairs are then tested by hand, and the board gaps checked for trapped debris. Anything ice will make dangerous goes first on the list of fixes.
Is rock salt bad for a wood deck?
The bigger damage from rock salt is not to the boards. The brine drains through the gaps onto steel hangers, nails and screws, and corrodes them. Sand for grip and a plastic shovel are gentler. If ice melt is needed, use a little and rinse it off in spring.
Should I cover my deck with a tarp for winter?
Usually not. A tarp traps leaves and moisture beneath it and stops the boards drying between storms. Snow sitting on an open deck is not the problem. Cover the furniture instead. Keep the boards and the gaps between them clear, so water can drain and the wood can dry.
What does a fall deck visit from Perfect Work include?
A fall visit from Perfect Work Remodeling & Repairs covers the frame from below. It also covers the ledger and flashing, and every railing and stair. Small fixes, such as a loose baluster or a lifted board, can often be done on the same visit. Larger repairs are priced separately, before the first freeze.
Can I leave furniture on my deck all winter?
Yes, if it stands on its own legs and is covered. Move anything that sits flat on the boards, such as planters, rugs and boxes. They trap water underneath. Leave room to shovel around the furniture, and keep the path from the door to the stairs clear.
A deck that comes through winter
A deck needs less in the fall than most lists suggest, and none of it is expensive. Clear what traps water and fix what ice will make dangerous. Then pick a shovel and ice melt that do less harm than the snow.
Perfect Work Remodeling & Repairs starts every fall visit under the deck. The frame there shows what the boards hide. Repairs found there fall under deck repair and replacement, priced before any work starts.
Call Perfect Work at 630-297-7888 · Book a deck check