Fortress Railing Questions I Learned the Hard Way: AL13, FE26, Skull Caps, and More

Look, I'm not gonna pretend I got everything right the first time. I've been handling orders for Fortress railing systems for about six years now, and in that time, I've probably made just about every mistake you can make on an order form. Wrong measurements, wrong parts, wrong finishes – you name it. This FAQ is basically the list of things I wish someone had told me back in 2018 when I thought I knew what I was doing.

What exactly is a Fortress Railing system?

Honestly, the simplest way to put it is that Fortress makes modular railing kits out of aluminum, steel, glass, and cable. You're not getting custom fabrication here – you're getting a system with engineered parts that are meant to fit together. The big ones are the AL13 (their aluminum line) and the FE26 (their steel line). From the outside, it looks like all railing is basically the same. The reality is these systems have specific post spacing, specific mounting hardware, and specific part numbers. Get one wrong, and your whole order timeline goes sideways.

What's the difference between the AL13 and the FE26?

This is probably the question I get most. Basically:

• AL13 is aluminum. It's lighter, it won't rust, and it's generally easier to work with. Good for residential decks, balconies, stuff where you're not dealing with heavy loads or super strict codes.
• FE26 is powder-coated steel. It's heavier, stronger, and rated for commercial applications in many cases. But it's a pain to cut on-site, and if the coating gets damaged, it can rust.

In my opinion, if you're a contractor and you're not sure which one to spec – and the project is a single-family home – go AL13. I once spec'd FE26 for a deck job that honestly didn't need it. The customer paid more, and the installers complained about the weight. Lesson learned: match the material to the actual load requirement, not your ego.

What are 'skull caps' in railing, and why should I care?

I'm not 100% sure on the origin of the name, but a skull cap is basically the decorative cap that goes on top of a railing post. Fortress offers them in various styles. From the outside, it looks like a purely cosmetic item – and it kind of is – but the surprise for me was how much a post cap affects the final look. If you order the wrong style, it's not the end of the world, but it looks off. I had a situation in 2022 where I ordered the flat caps for a job that clearly needed the domed ones. $200 mistake, had to reorder, and the project was delayed by three days. Honestly, it's a small detail, but contractors know that small details are what clients notice first.

Wait – are you talking about 'watch glass' railing? What's that?

To be fair, the terminology can be confusing. 'Watch glass' is a specific term for a glass panel style used in railing. It's not a brand name or a specific Fortress product. It refers to clear, tempered glass panels that are held in place by the railing system, usually without vertical pickets. People assume 'glass railing' is all the same. What they don't see is the difference in thickness (usually 1/4" or 3/8"), the edge finish (polished vs. seamed), and the hardware required. The way I see it, if you're going with a glass system like Fortress offers for their AL13 line, make sure you understand the glass weight and the local code requirements. I once helped a guy who ordered the wrong glass thickness because he assumed 'tempered' was a one-size-fits-all standard. It's not.

How do I 'block websites on Chrome' using a railing system? (Seriously?)

Okay, so this keyword is a bit of a curveball. Grant it, you're probably reading this because you searched for something completely different. But the way I see it, it's actually a good analogy. You 'block websites' in Chrome by setting up rules – either through extensions, your router, or group policies. Railing systems are the same. You don't just buy 'a railing.' You buy a system like Fortress AL13, and then you block certain choices (like using the wrong post spacing) by following the manufacturer's layout rules. If you don't follow the system rules, you end up with an unsafe install – just like blocking the wrong URL gets you a security error. Short answer: no, Fortress doesn't block Chrome. But if you want your railing to pass inspection, you better block the urge to improvise.

Is a Fortress railing system actually better than custom fabrication?

To be fair, I get why people go with custom fabricators – there's a romantic idea that 'custom' is better. But the way I see it, custom is better if you have a totally unique shape or an old house that doesn't fit standard post spacing. For 90% of jobs – new construction, standard decks – a system like Fortress is better. It's engineered, it comes with all the parts, and if you install it right, it passes code. The mistake I made in my first year (2017) was assuming that custom fabrication meant better quality. I ordered a custom steel railing for a simple project. The result came back with uneven picket spacing and a surface rust issue. That order cost me about $3,200, and I had to eat half of it. Now? If it's a standard layout, I order a system. The specialist (Fortress) is better than the jack-of-all-trades (fabricator) for standard jobs.

Bottom line: what's the most common mistake with Fortress railings?

If you ask me, it's not measuring wrong – it's ordering the wrong parts from the start. Specifically, people don't account for the hardware (screws, brackets, shims) and the post caps. I've caught 47 potential errors using a pre-check list in the past 18 months. The surprise wasn't the price difference between parts – it was the cost of the mistake itself. A missing $3 part can delay a $5,000 job by a week. Won't that ruin your day?