16-Gauge Galvanized Steel · 25-Year Warranty · Class A Fire Rated · Zero Maintenance
Most decks are built on wood framing that fails in a decade. Your decking and railing are engineered to last 25+ years — your framing should be too. We build on Fortress Evolution steel. Every elevated project. No exceptions.
Pressure-treated lumber is familiar and inexpensive — but what happens beneath the surface, where nobody looks until it's too late, is the real problem. Illinois freeze-thaw cycles accelerate every one of these issues:
Actual specs of the Fortress Evolution system as installed on every Ace of Decks elevated project.
| Specification | Fortress Evolution Steel | Pressure-Treated Wood |
|---|---|---|
| Material | 16-Gauge Carbon Structural Steel | Pressure-Treated Lumber |
| Tensile Strength | 50,000 PSI | ~7,000 PSI |
| Galvanization | G60 Dual-Layer | N/A |
| Fire Rating | ✓ Class A (NFPA) | ✕ Combustible |
| Manufacturer Warranty | ✓ 25-Year Limited | ✕ None |
| Rot / Moisture | ✓ Completely Impervious | ✕ Absorbs & Rots |
| Dimensional Stability | ✓ Stays Straight — Always | ✕ Warps Over Time |
| Insects | ✓ Impervious | ✕ Susceptible |
| Span Capability | Longer Spans · Fewer Posts | Limited by Lumber |
| Illinois Winters | ✓ Unaffected by Freeze-Thaw | ✕ Expands & Deteriorates |
| Maintenance | ✓ None Required | ✕ Ongoing Inspection |
| TimberTech Compatible | ✓ All Collections | ✓ All Collections |
The right framing unlocks premium systems that simply aren't reliable on wood. These are the capabilities steel makes possible.
A waterproofing membrane needs a stable, moisture-resistant substrate to perform long-term. Steel ensures the membrane stays sealed — protecting the structure and creating usable space below.
PVC, cedar, or hardwood ceilings below an elevated deck stay level only if the framing does. Steel stays level, so the ceiling stays level — for the life of the project.
Louvered pergolas attached to deck structures place additional lateral and vertical loads on the framing. Steel handles these loads precisely and safely.
Cable rail places significant lateral tension on the structure. Steel framing provides the rigidity required for cable and glass systems to perform safely without movement or flex.
Steel's precision-manufactured components make curved decks, multi-level transitions, and complex frame configurations more structurally consistent than wood allows.
For second-story decks, large multi-level structures, and commercial projects, steel provides the engineering documentation and load capacity required for permit approval.
Steel framing typically adds $15,000–$30,000 to a project compared to wood. For homeowners investing $60,000–$300,000+, the framing is not where to cut costs. Here's why:
Wood framing warps, rots, and deteriorates through Illinois freeze-thaw cycles. Fortress Evolution steel stays dimensionally stable for the life of the deck, carries a 25-year manufacturer warranty, and protects everything built above and below it. For the investment level our projects represent, steel is the right choice.
Yes — typically $15,000–$30,000 more than wood framing. For homeowners investing $60,000–$300,000+ in an outdoor living space, framing is not where to compromise. Steel eliminates long-term structural maintenance and protects every other system on the project.
Steel makes the most sense for elevated and second-story decks, long-span designs, projects with under-deck waterproofing or finished ceilings, cable or glass railing systems, and any build where structural precision matters. We evaluate framing recommendations during the design phase — ask us during your paid in-person consultation ($150).
Fortress Building Products covers Evolution framing with a 25-year limited manufacturer warranty on structural defects. Wood framing carries no manufacturer warranty at all. View the full Fortress warranty →
Yes — completely. Fortress Evolution is compatible with all TimberTech composite and PVC collections. We install TimberTech exclusively and have combined these two systems on dozens of projects across the Chicago suburbs.
We'll walk you through whether steel framing makes sense for your specific project — the spans, loads, and systems involved. During your paid in-person consultation, we give you real framing recommendations and pricing.
Tell us about your project — we respond within 1 business day.
