Building a Midwest-Proof Deck:
High-Performance Framing & Advanced Decking Materials for Western WI & East Twin Cities
Living in Western Wisconsin or the East Twin Cities Metro area (cities like Hudson, River Falls, Stillwater, Woodbury, and Hastings), outdoor decks face one of the harshest climates in North America. From +95°F humid summer days to -20°F freeze-thaw winter cycles, standard building materials often degrade long before their expected lifespan.
When homeowners invest thousands of dollars into premium, low-maintenance composite or PVC deck boards, they often assume their new deck will last 30 to 50 years. However, a deck is only as strong as its foundation and framing. Installing 50-year warranty decking on top of cheap, standard pressure-treated lumber creates a major structural vulnerability: your framing becomes the weakest link.
At Strongpoint Garage and Deck, we avoid building long-lasting composite decks on top of standard pressure-treated wood. Below is a breakdown of the high-performance framing and decking options engineered to survive Midwest weather extremes.
The Hidden Problem with Standard "Wet" Pressure-Treated Lumber
Standard pressure-treated (PT) framing lumber suffers from a double-whammy of high moisture content:
Green Lumber Base: Standard lumber is milled from fresh, harvested timber that naturally retains high levels of internal moisture ("green" wood).
Water-Based Chemical Injection: During the treatment process, lumber is placed in a giant vacuum cylinder flooded with copper-based preservatives suspended in a solution that is over 99% water. Industrial pressure forces gallons of this liquid deep into the wood's cellular structure.
Because standard PT lumber is shipped and sold immediately after this process without being re-dried, it arrives on the job site completely saturated—often with a moisture content between 30% and 40%.
All of that water quickly begins to evaporate as soon as the material is put out in the sun and joists start getting hung. The rest of that trapped water continues to evaporate over its first few seasons under the Midwest sun, causing the wood to undergo violent dimensional movement:
Severe Shrinkage: As water leaves the board, joists lose overall volume, leaving gaps and loose connections.
Warping, Twisting, & Cupping: Drying forces seemingly straight boards to bow and twist, ruining the flat plane of your deck.
Fastener Failure: Board movement pulls hidden fasteners and screws loose, causing squeaks and wavy decking lines.
If your composite or PVC deck boards carry a 25- to 50-year warranty, placing them over a frame that is literally drying out and twisting beneath them makes zero sense. That is why we won't even touch regular PT lumber for a composite deck build.
Here’s our solution:
Premium Framing Options Designed to Outlast the Weather
To match the lifespan of modern low-maintenance decking, advanced framing materials are engineered specifically for dimensional stability, high load capacity, and rot resistance.
1. ProWood® TruFrame™ Joists (Our Standard Minimum Entry)
How It Works: ProWood® TruFrame™ undergoes a specialized kiln-drying process after treatment to remove excess chemical moisture before the lumber ever reaches your job site.
Why We Use It: ProWood TruFrame is our standard baseline option on every new composite deck we build. Because it arrives pre-dried, it stays laser-straight, resisting the severe shrinking, twisting, and bowing typical of standard PT framing. It provides a stable, flat surface that keeps composite lines crisp for decades.
2. Treated LVL (Laminated Veneer Lumber)
How It Works: Treated LVL consists of multiple thin layers of wood veneer bonded together with waterproof adhesives and infused with wood preservatives.
The Benefits: LVL offers far greater structural strength and span capabilities than traditional dimensional lumber. It allows for wider joist spans, fewer support posts, and flatter deck framing over long distances without crowning.
3. Owens Corning Lumber (Structural Composite Framing)
How It Works: OC Lumber joists, beams, and ledgers utilize fiberglass-reinforced polymer technology that completely eliminates wood from the framing structure.
Ledger Board Advantage: The ledger board is the single most critical structural connection on your entire deck because it anchors the frame directly to your home's foundation and rim joist. Rot at the ledger is a leading cause of catastrophic deck failure. Using OC Lumber as a ledger board means it can NEVER rot, absorb water, or decay, securing the crucial bond between your home and your outdoor living space forever.
Overall Framing Performance: 100% moisture-proof, zero thermal shrinkage, insect-proof, and impervious to freeze-thaw cycles and direct water contact.
Next-Generation Decking: No-Wood Composite & PVC Options
Once you have a true 25 - 50-year frame, pairing it with high-grade, low-maintenance decking creates a seamless, worry-free outdoor space.
Deckorators® Voyage Decking with Surestone™ Technology
Deckorators Voyage is a mineral-based composite (MBC) decking board that contains no wood fiber.
Surestone™ Technology: Uses crushed minerals and polyolefin plastic to create lightweight, ultra-dense boards.
Key Benefits for WI & MN:
Near-Zero Thermal Movement: Virtually eliminates expansion and contraction at board ends during harsh winter drops or hot summer spikes.
Unmatched Traction: Delivers up to 34% better traction than standard composite decking, even when wet.
Ground & Water Contact Approved: Can be installed directly in ground contact or underwater without voiding the warranty.
Warranty: Backed by a 50-year structural warranty.
TimberTech® Advanced PVC Decking
TimberTech’s Advanced PVC lines feature 100% synthetic PVC cores capped on all four sides with polymer protection.
Key Benefits for WI & MN:
No Wood Fillers: Completely moisture-resistant; will not absorb water, freeze-crack, or swell.
Cool-Touch Engineering: Stays up to 30°F cooler underfoot than standard composite products on hot summer days.
Realistic Wood Grain: Alloy Armour Technology® protects against scratching, fading, and staining from snow, leaves, grill grease, and UV exposure.
Warranty: Features a 50-year limited fade and stain warranty.
Why Matching Your Decking to Your Subframe Matters
Installing Deckorators Voyage or TimberTech PVC on top of standard green pressure-treated framing creates an imbalance in longevity:
When wet framing lumber shrinks and twists underneath high-grade decking, it forces fasteners to pull out, distorts picture-frame borders, and causes uneven surfaces—forcing expensive repairs or premature rebuilds while the deck boards themselves are still in perfect condition.
By insisting on ProWood TruFrame, Treated LVL, or Owens Corning Lumber, we ensure the entire deck structure matures uniformly over 25 to 50+ years.
Ready to Build a Deck Built for Midwest Extremes?
Choosing the right combination of decking and framing materials depends on your home's layout, budget, elevation, and long-term goals. Don't let cheap framing compromise a major investment in your home's outdoor living space.
Contact Strongpoint Garage and Deck today to schedule a consultation. We'll walk you through material samples, evaluate your property and determine the exact structural framing and decking options best suited for your project.