You're looking to build a new deck, or maybe replace an old one, and you've heard about metal framing. Good for you. It's a smart choice, especially with the wild weather we get here in St. Paul. But then you run into the next decision: steel or aluminum? It's not just about what looks good on paper; it's about what holds up best right here in Minnesota.
The Case for Steel Deck Frames
When most folks think 'metal deck,' they're probably picturing steel. And for good reason. Steel is incredibly strong. We're talking about a material that can span longer distances without needing extra support, which means fewer posts cluttering up your yard or blocking your view. That's a big plus if you're trying to maximize usable space under your deck or want a cleaner look.
Durability is another huge factor. Steel is tough. It doesn't warp, twist, or rot like wood. You won't have to worry about termites making a meal out of it. When it's properly galvanized or coated, it's highly resistant to corrosion. I've seen steel frames on homes in Highland Park that have stood up to decades of our harsh winters and humid summers without a hitch.
Now, let's talk cost. Generally, steel can be a bit more expensive upfront than wood, but often comparable to or even slightly less than aluminum, depending on the specific system and design complexity. The long-term savings on maintenance and replacement often make it a worthwhile investment.
However, steel isn't without its quirks. It's heavy. That means it takes more effort to transport and install. You need specialized tools and skilled labor to cut and fasten it correctly. If you're looking for a DIY project, steel might be a bit much to bite off. And while galvanized steel is corrosion-resistant, any scratches or exposed areas can still rust over time if not properly maintained or coated. You've got to make sure your contractor knows what they're doing with the coatings and connections.
The Lowdown on Aluminum Deck Frames
Aluminum is the other major player in the metal deck game. It's also strong, but in a different way than steel. The biggest advantage of aluminum? It's lightweight. This makes it much easier to work with, both for us during installation and for your home's foundation. Less weight means less strain on your existing structure, which can be a real benefit for older homes, say, in the Summit Hill neighborhood where foundations might already be a century old.
Corrosion resistance is where aluminum really shines. It naturally forms an oxide layer that protects it from rust, even without special coatings. You don't have to worry about it staining your concrete patio below if it gets scratched. It's essentially maintenance-free in terms of rust.
Appearance-wise, aluminum often comes in sleek, pre-finished profiles that can look really modern and clean. It’s also often used for those integrated decking systems where the frame and decking are all one unit, which can be appealing.
But aluminum has its own set of trade-offs. While strong for its weight, it's not as stiff as steel. This means for the same span, you might need a larger aluminum beam or more support posts to prevent deflection. It can also be more susceptible to bending or denting under extreme impact compared to steel. And here's the kicker for many homeowners: cost. Aluminum framing systems are typically more expensive than steel, often by a noticeable margin, especially for larger or more complex decks.
My Recommendation for St. Paul Homeowners
Alright, so you've got steel, which is super strong and durable, and aluminum, which is lightweight and incredibly corrosion-resistant. Which one should you pick for your St. Paul home?
For most of my clients at St Paul Deck Solutions, I lean towards steel framing. Here's why:
- Strength and Span: Our ground freezes and thaws, and we get heavy snow loads. The sheer strength of steel allows for more robust, stable decks that can handle these conditions with fewer supports. This means less digging for footings and a more open feel under your deck.
- Cost-Effectiveness: While not dirt cheap, steel offers a fantastic balance of performance and price. You're getting a superior, long-lasting product without breaking the bank, leaving more budget for your preferred decking material or railings.
- Durability in the Face of the Elements: When properly galvanized and installed, steel stands up to everything Minnesota throws at it. You just can't beat that peace of mind.
Now, if you have a very specific design constraint, like an extremely limited foundation capacity or a desire for a very specific, lightweight, integrated system, then aluminum might be worth considering. But for the vast majority of residential decks we build here, steel is simply the more practical, durable, and cost-effective choice for the long haul.
Ultimately, the best frame is the one that's designed right for your specific project and installed by people who know what they're doing. Don't hesitate to ask your contractor about their experience with both materials. We're happy to walk you through the specifics for your property.