What Architects Get Wrong About Iron Doors
Chad Crenshaw
I work with architects regularly. I enjoy it — they’re usually the most detail-oriented people in the room, which is my kind of conversation.
But there are patterns I see in iron door specs that cause problems downstream. Expensive problems. Problems that delay projects, require redesign, or result in a door that looks right in the plans and fails in the field.
I’m writing this because I’d rather flag these issues up front than fix them after the door is in production.
If you’re an architect specifying iron or steel entry doors — or you’re a homeowner working with one — here’s what to watch for.
Mistake #1: Specifying Gauge Without Specifying the Frame
Architects who’ve done their homework usually know to specify gauge. “14-gauge steel,” for example. That’s a start.
But gauge alone doesn’t tell you enough.
The critical distinction is whether the gauge spec applies to the panel face or the frame tube. These are different components, and a supplier who builds a thick face on a thin frame has technically met a vague spec while delivering an inferior door.
What you should specify:
- Frame tube gauge (the structural backbone — this is what matters most)
- Panel face gauge (the visible surface)
- Whether the frame is welded box tube or formed channel — box tube is significantly stronger
- Minimum wall thickness for the frame, not just nominal gauge
When I review a spec that just says “14-gauge iron door,” I ask the architect to tell me which component that refers to. Half the time, they’re not sure. That’s the gap a commodity supplier will exploit.
Mistake #2: No Thermal Break Requirement
This one surprises architects the first time I raise it, especially for projects outside Texas.
Iron and steel conduct heat. An iron door frame without a thermal break is a heat bridge — direct thermal transfer between exterior and interior, right at one of the most visible parts of the home.
In Texas summers, this means:
- The frame surface is hot to the touch on the interior
- Condensation on the interior frame face when AC runs
- Accelerated expansion/contraction cycles that stress seals and hardware
- Increased thermal load on the HVAC system
A proper thermal break spec requires a non-conductive barrier within the frame construction — not just insulated glass (which is a separate spec), but insulation at the frame itself.
Most stock iron door specs don’t include this. Most architects don’t know to add it. Most suppliers don’t offer it unless you ask.
We build thermal breaks into our single entry iron doors as a standard design feature, not an upgrade.
→ If you’re unsure how to write this into a spec, reach out to schedule your free consultation and I’ll help you get the language right.
Mistake #3: Generic “Iron Door” Callouts
The most common spec mistake I see is the simplest: writing “iron door” or “iron entry door” without any further qualification.
Iron is a material, not a product category. You can build a $3,000 iron door and a $30,000 iron door using the same base material.
The difference is in everything else:
- Frame construction method (welded tube vs. formed channel)
- Steel alloy grade
- Coating system (powder coat vs. primer-only vs. full multi-stage finish)
- Glass specification (single pane vs. double pane vs. argon-filled)
- Hardware grade and corrosion resistance
- How the door is fitted to the frame — factory fit vs. field trim
When an architect writes “iron door to match design intent,” the contractor buys whatever ships cheapest to the spec. That’s not a knock on contractors — it’s a natural consequence of an incomplete spec.
The Iron & Steel Door Buyer’s Guide covers every one of these specification points in detail. I’d recommend it as a reference document for any architect writing iron door specs.
Mistake #4: Not Specifying the Astragal Type
For single doors, this isn’t relevant. For double doors — and most high-end entries are double doors — it’s critical.
The astragal is the vertical seal strip between the two active door panels.
It’s the component that determines:
- How well the double door seals against weather
- How the doors close relative to each other
- Whether the seal maintains integrity over years of use
Generic specs say “astragal as required” or don’t mention it at all. This leaves the selection to the manufacturer’s default, which is usually a standard T-astragal.
What you should specify:
- Astragal profile type (T vs. Double-T vs. surface-applied)
- Material (aluminum, steel, or composite)
- Engagement method (magnetic catch vs. mechanical latch vs. passive overlap)
- Weatherstrip material integrated with the astragal
Our patented Double-T astragal is part of our double door system because I designed it specifically to work with our frame construction. It’s not an afterthought. For architects speccing our double entry doors, I include astragal detail drawings on request.
Mistake #5: Assuming Field Adjustment Will Fix Factory Problems
I hear this one from contractors: “We’ll sort it out on site.”
You can’t field-adjust a poorly manufactured iron door into a well-manufactured one.
Iron doors are heavy — a set of double iron doors can weigh 400–600 pounds. The frame is rigid. The fitting tolerances are set at the factory. If the door comes out of the factory with a twist, an out-of-square frame, or glass that’s not properly seated, those aren’t field problems. They’re manufacturing problems.
The right solution is to hold the manufacturer to factory-fit standards before the door ships. That means:
- Doors pre-hung in the frame at the factory
- Swing and latch function tested before shipping
- Factory fit documentation provided with delivery
- A defined process for addressing defects before installation
We do all of this. We also publish our comparison criteria openly — you can see exactly how our manufacturing process stacks up against competitors.
How I Work With Architects
I want to be clear about how I approach this.
I’m not trying to position architects as the problem. The problem is an industry that hasn’t given architects the tools to write precise iron door specs, because precision would make it harder to sell commodity products.
My job — the part I actually enjoy — is sitting down with an architect early in the project and going through the spec together.
What’s the design intent? What are the performance requirements? What’s the thermal environment? Double or single? What hardware aesthetic? Glass pattern?
From that conversation, I can produce a spec-ready document with the exact language needed to ensure the door that gets installed matches what the design called for.
If you’re an architect working on a project with iron or steel doors, I’d genuinely welcome that conversation.
→ Schedule your free consultation and let’s get the spec right from the start.