Why Your Deck's Framing Matters More Than the Decking Boards
When most Wisconsin homeowners plan a new deck, they spend most of their time thinking about the surface. Which color Timbertech looks best against the house. Whether to go with aluminum or steel railings. How wide the boards should be. All of that matters, but none of it matters as much as what goes underneath.
The framing is the skeleton of your deck. It determines how the deck performs, how long it lasts, and whether the surface stays level and tight or starts showing problems within the first few years. And yet most homeowners never ask a single question about it.
What Deck Framing Actually Does
The framing is everything underneath the surface boards. Ledger board, rim joists, interior joists, beams, and posts. Together they carry the load of the deck, transfer it to the ground, and hold the surface boards flat and even over time.
When framing is done well, you don't notice it. The deck stays level, the boards don't move, and nothing needs attention for decades. When framing is done poorly, you start noticing it within a few years. Boards go uneven. Fasteners work loose. Sections of the surface start to sag or cup. And the fix usually involves tearing apart the deck to get to what's underneath.
Get a Free Estimate
The Problem With Standard Treated Lumber
Most decks in Wisconsin are framed with standard pressure treated lumber, and that's where a lot of long-term problems start.
Here's the issue. Pressure treated lumber is wet when it leaves the treatment facility. It gets installed on your deck while it's still full of moisture, and then it dries out slowly over the following months and years. As it dries, it shrinks and twists. That movement affects everything sitting on top of it.
What happens when framing lumber moves after installation:
- Deck boards shift and go uneven as the joists beneath them change shape.
- Fasteners loosen as the wood shrinks away from them.
- Gaps open between boards that were tight on installation day.
- Sections of the deck develop a slight slope or sag that gets worse over time.
None of this is visible from the surface until the damage is already done.
Why KDAT Framing Solves the Problem
KDAT stands for Kiln Dried After Treatment. The lumber goes through the treatment process and then gets dried in a kiln before it ever ships to a job site. By the time it arrives, it's already dimensionally stable.
That one difference changes how the whole deck performs long-term:
- Framing holds its shape from the day it's installed
- Surface boards stay flat and even because what's underneath isn't moving
- Fasteners stay tight because the wood isn't shrinking away from them
- The deck performs consistently for decades without the early problems that wet framing causes
We use KDAT framing on every deck we build at
Brew City Builders, composite or wood, residential or commercial. It costs slightly more than standard treated lumber. But a decade from now, when the deck built with wet framing needs attention and the KDAT-framed deck is still flat and solid, the difference shows clearly.
The Question Worth Asking Before You Hire Anyone
Before you sign a contract with any Wisconsin deck builder, ask one question. What framing lumber do you use and why? The answer tells you a lot about how that contractor thinks about the long-term performance of the deck they're building.
If you want to talk through framing options for your Wisconsin deck project, call us at (414) 453-1235 or stop by our West Allis showroom any weekday.