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Fortress Steel Frame Installer in Colorado

Colorado’s #1 installer for steel-frame decks engineered for unmatched strength, stability, and longevity

Alta Outdoor Living is your trusted Fortress® Evolution Steel Framing installer along the Front Range. We build deck foundations engineered to outlast Colorado’s harshest conditions—and your expectations.

Why We Build with Fortress Steel?

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Strength
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Durability
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Precision

Your decking and railing are engineered to last 25 years or more. So why would you support them with wood framing that warps, cracks, and deteriorates in half that time?

At Alta Outdoor Living, we’ve chosen Fortress® Evolution Steel Framing as our preferred substructure system because it solves the fundamental problem with traditional deck construction: the hidden weakness underneath. This galvanized steel system delivers a perfectly straight, dimensionally stable foundation that matches the longevity of premium composite decking; giving you a deck that performs as beautifully in year 25 as it does on day one.

For Colorado homeowners, the choice is even clearer. Our intense UV exposure, dramatic freeze-thaw cycles, heavy snow loads, and ever-present wildfire risk demand a framing solution that wood simply cannot deliver.

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Steel vs. Wood Comparison

Feature Fortress® Evolution Steel Pressure-Treated Wood
Expected Lifespan 25–50 years 7–15 years
Structural Stability Perfectly straight, dimensionally stable Warps, cups, crowns, twists
Fire Rating Class A (noncombustible) Highly combustible
Moisture/Insect Resistance Impervious Vulnerable to rot, termites
Maintenance Required Near zero Ongoing inspection, treatment
Maximum Joist Span Up to 20 feet Limited (varies by species)
Maximum Cantilever Up to 5 feet 18–24 inches typical
Manufacturer Warranty 25-year limited None
WUI Zone Approved Yes No (unless fire-retardant treated)

Built For Colorado

Colorado isn’t gentle on outdoor structures. Our high-altitude environment creates a unique combination of challenges that accelerate the deterioration of traditional wood framing.

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Intense UV Exposure

At elevation, UV radiation is significantly stronger than at sea level. While this damages wood fibers and degrades protective treatments faster, steel's powder-coat finish provides consistent protection year after year.

Extreme Freeze-Thaw Cycles

Wood absorbs moisture and expands when it freezes—then contracts as it thaws. Over hundreds of cycles per year, this tears wood fibers apart from the inside out. Steel doesn't absorb moisture, so freeze-thaw cycles have no structural impact.

Heavy Snow Loads

Steel's superior load-bearing capacity (50–200 psf vs. the 40 psf code minimum) means your deck handles heavy spring snowfalls without stress on connections or sagging between joists.

Wildfire Risk

For the millions of Colorado homeowners in or near WUI zones, noncombustible framing isn't just smart, it's often required by code. Evolution's Class A fire rating makes it approved for construction in wildfire-prone areas where wood framing may not be permitted.

The Fortress Evolution System

Fortress didn’t just make steel versions of wood components; they redesigned deck framing from the ground up. The Evolution system features interlocking parts and pre-punched connection points that speed installation while ensuring rock-solid structural integrity.

  • S-Ledger System: The engineered “S” shape creates an interlocking connection with ledger brackets that eliminates excessive fasteners and dramatically speeds up installation while providing a secure attachment to your home.
  • Steel Joists: Cold-rolled to exact dimensions, Evolution joists arrive straight and install flat. Pre-punched holes ensure consistent spacing and eliminate guesswork during installation.
  • Engineered Beams: Designed for maximum span between support posts, Evolution beams support both drop and flush configurations with single or double beam options depending on load requirements.
  • Black Sand Powder Coat: The premium finish over galvanized steel provides corrosion resistance and a refined appearance that blends seamlessly with composite decking from any angle.
  • Complete Stair System: Evolution includes the industry’s first complete steel stair framing system, with components designed to integrate with the deck frame for consistent aesthetics and structural performance.
10'x10' Engineering diagram provided by Fortress

Why Choose Alta for Steel Framing

Working with steel requires training, precision, and understanding of the material’s unique characteristics. As certified Fortress installers, our team has invested in mastering the Evolution system so every project benefits from proper technique and optimal material use.

Certified Installation

We’ve completed Fortress Master Class training and maintain direct relationships with Fortress engineering support for complex projects.

We understand Front Range building codes, WUI requirements, and permit processes specific to your municipality.

We pair steel framing with premium composite decking, quality railings, and thoughtful design to create outdoor spaces that perform as well as they look.

From initial consultation through final walkthrough, we keep you informed about material choices, timelines, and the reasoning behind our recommendations.

Serving Castle Rock Colorado & Beyond

We provide exceptional decking services in the following Colorado counties:

Douglas County

El Paso County

Elbert County

Arapahoe County

Jefferson County

Denver County

Adams County

Boulder County

Boulder County

What Our Customers Say About Us

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Benjamin Paige profile picture
Benjamin Paige
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We had a great experience working with Alta during the quote and planning process. They were professional, responsive, knowledgeable, and very generous with their time. We really appreciated their honesty, integrity, and clear communication.
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Sophie Parker profile picture
Sophie Parker
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Alta put a louvered roof over our existing patio instead of replacing everything. Saved us money and time. Jon Potter explained that our concrete was still good, just needed the cover. The Azenco system they installed works with a remote - open it when we want sun, close it when it's too hot. Simple concept, works exactly like they said it would. Crew was professional, in and out in under a week. Good experience overall, would recommend them to friends in Greenwood Village.
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Lee Rodgers profile picture
Lee Rodgers
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Our house in Cherry Creek is older, built in the 80s. Wasn't sure how a new deck would look with it. Dave Little took time to match the style instead of just slapping something modern on there. The privacy screens they designed fit the architecture. This deck builder actually cared about making it look right, not just functional. My partner was worried it would look out of place but it doesn't. Gets compliments from neighbors pretty regularly.
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Gabriela Perez profile picture
Gabriela Perez
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Wasn't sure about spending this much on a deck. Jeff came to our place in Larkspur with actual samples, not just pictures. Showed us what composite looks like after a few years versus new. That helped. Jon Potter walked through the cost breakdown so we understood where the money was going. Decided to go for it. Four months later, using it almost every evening. Turns out it was worth it.
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Amber Jenkins profile picture
Amber Jenkins
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Finally have a patio we actually use in the evenings. The fire pit Jeff Potter helped us design sits perfectly with our new deck and railings, and the cedar tongue-and-groove cover overhead keeps us dry when the weather turns. We're in Colorado Springs and weren't sure a Castle Rock company would want to make the drive, but they never once made it feel like an inconvenience.
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Rosie Smith profile picture
Rosie Smith
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Our deck in Larkspur was too hot to use most afternoons. Jon Potter added a louvered roof that we can close when the sun hits. Simple fix, works great. They also replaced the railings with something sturdier. My kids lean on them constantly and they haven't budged. Project stayed on schedule.
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Logan Hayes profile picture
Logan Hayes
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Jon made everything clear, he was upfront about the cost and timeline, so there were no surprises at all. We had a louvered roof installed over our patio, and it turned out perfectly. The water now drains away from the house instead of pooling, which was a big issue for us before. The whole project was completed in just three weeks, and we’d definitely use them again.
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Miles Henderson profile picture
Miles Henderson
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We were surprised at how easy Jon Potter made getting our deck approved and built. He handled all the paperwork and even accompanied us to the HOA review meeting, which really made a difference. The deck builder and privacy screens his team designed got approved on the first try, something that rarely happens in our neighborhood. The crew was respectful and quiet while working, which we appreciated since most of us work from home. Eight months later, the deck still looks fantastic and hasn’t required any maintenance.
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Jared Watson profile picture
Jared Watson
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We were initially told by several deck builders that the cost to engineer a deck would be very high. Jeff Potter saw it differently and proposed a much simpler solution that fit the terrain perfectly without overcomplicating the design. The end result was a multi-level composite deck that feels natural and thoughtfully planned, not forced in any way. We later added an Azenco roof, and it blended seamlessly with the original deck layout. The pricing was fair, the project stayed on schedule, and the crew always made sure the site was cleaned up at the end of each day.
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Penelope Castillo profile picture
Penelope Castillo
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We wanted to upgrade our deck in Monument without starting completely from scratch, and this team delivered exactly that. They reused the existing posts, which saved us a lot of money, and only replaced what truly needed work. Dave Little’s crew was efficient and thoughtful throughout the process. Jon even caught and fixed a drainage issue that no one else had brought up. The new Azenco louvered roof is perfect for adjusting shade, and since the project was finished in May, we’ve been using the deck almost every day.

FAQs

Is steel framing worth the additional investment?

When you consider that wood framing typically needs replacement well before your composite decking wears out, steel framing often costs less over the life of your deck. You’re also investing in fire safety, structural stability, and the peace of mind that comes with a 25-year manufacturer warranty. For most homeowners planning to stay in their home long-term, the value is clear.

With the galvanized steel and powder-coat protection, Evolution framing is designed to last 25–50 years under normal conditions. Fortress provides a 25-year limited warranty (10 years within one mile of saltwater). Compare this to pressure-treated lumber’s 7–15 year typical lifespan, and steel’s longevity advantage becomes substantial.

Yes. Evolution steel framing works with composite, PVC, aluminum, tile, wood, and tropical hardwood decking. The consistent flatness and dimensional stability actually make it an ideal substrate for any decking material you choose.

The framing is underneath your deck boards, so surface temperature is determined by your decking material, not the substructure. Steel’s thermal stability is actually an advantage, as it doesn’t expand and contract like wood does with temperature changes, which prevents the loosening of connections and movement that causes squeaking and deck board issues.

Absolutely. Evolution steel framing is ICC-ES certified and approved for residential deck construction. In WUI zones where fire-resistant construction is required, steel framing often exceeds minimum code requirements. We handle permitting and can provide engineering documentation for your specific project.

Fortress provides Black Sand touch-up paint specifically for sealing cut ends and covering any scratches or scuffs. Because the steel is galvanized underneath the powder coat, minor scratches don’t compromise the structural protection—the touch-up paint simply maintains the cosmetic finish and adds an extra layer of corrosion resistance.

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Ready for a Deck Built to Last Decades?