Fall Deck Checklist -

Get Your Deck Ready for a Wisconsin Winter 

Wisconsin winters are hard on outdoor structures. Repeated freeze-thaw cycles, snow load, and months of moisture sitting on surfaces all take their toll. Spending an hour or two on your deck in October is a lot easier than dealing with problems that show up in April after a full winter of neglect.

Clean the Surface Thoroughly


Start with a full cleaning of the deck boards. Leaves, debris, and organic matter hold moisture against the surface through winter and accelerate wear, especially on wood decks. Sweep everything off and get into the gaps between boards where material tends to collect.


For composite decking, a basic wash with soap and water is enough. For wood, a deck cleaner appropriate for your wood type and finish removes buildup that traps moisture. Don't pressure wash on a high setting, it can raise the grain on wood and damage composite surfaces if you're too close.

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Check the Structure


While the deck is clean and visible, take a look at the structural components:



  • Ledger board: Check where the deck connects to the house. Look for any gaps in the flashing, signs of moisture damage, or areas where debris has collected and held water against the house.
  • Posts and post bases: Look at the base of each post for soft spots or discoloration that indicates rot starting to develop.
  • Joists and beams: If you can see the framing from underneath, look for any sagging, soft spots, or signs of pest activity.
  • Fasteners and hardware: Check for any bolts, screws, or joist hangers that have corroded or worked loose over the season.


Catching a small structural issue in fall is far less expensive than finding out about it in spring after winter put additional stress on the problem.

Inspect the Railings


Grab each railing section and give it a firm shake. Any movement that wasn't there before is worth investigating. Post connections loosen over time, especially on wood railings where the material has expanded and contracted through multiple seasons. Tighten any loose hardware and look for any balusters that have shifted or cracked.

Clear Drainage Paths


Make sure water has somewhere to go when snow melts. Check that the gaps between deck boards are clear and that nothing is blocking drainage at the edges of the deck. Water that pools on the surface and refreezes repeatedly does more damage than snow load alone.

Store or Cover Furniture and Accessories


Patio furniture left out through a Wisconsin winter takes a beating. If you have storage space, bring it inside. If not, stack it and cover it with a breathable cover that won't trap moisture underneath. Planters should come in or be emptied since water left in ceramic or terracotta freezes and cracks the container.


Remove any string lights or temporary fixtures you don't want exposed to ice and snow for four months.

Note Anything That Needs Attention in Spring


If you spot boards that are starting to show wear, railings that need attention, or any structural issues you want a professional to look at, write it down now while it's fresh. Spring fills up fast for deck contractors in Wisconsin. Getting on a schedule in March means the work happens in May. Waiting until May to call usually means July.


If your deck is showing signs that go beyond seasonal maintenance, call Brew City Builders at (414) 453-1235 or stop by our West Allis showroom any weekday to talk through what it needs.