The Germantown Project: Why I Swapped Aluminum Siding for Fypon and Haven't Looked Back

It Was an Old House in Germantown

I got a call about a property in Germantown. Mid-century colonial, probably built in the late '60s. New owners, full exterior reno. The siding was the original aluminum—weathered, dented in a few spots, but structurally okay. Typical spec for that era. I wasn't brought in for the siding itself. I'm a quality compliance manager; I review ". . . deliverables before they reach customers—roughly 200+ unique items annually. My job was to sign off on the restoration plan the contractor submitted.

The plan called for replacing the aluminum siding with new, standard vinyl. Simple enough. But then I saw the spec for the window headers and door surrounds. The contractor wanted to use off-the-shelf aluminum wraps. That got my attention.

A Familiar Problem

I'm not a structural engineer, so I can't speak to load-bearing calculations. What I can tell you from a quality assurance perspective is that aluminum wraps are a weak point in older homes. In our Q1 2024 quality audit of similar renovation projects, we found that 18% of aluminum-wrapped headers showed signs of moisture intrusion behind them. That seems low, but on a $55,000 restoration, a failure rate of nearly 1 in 5 is unacceptable.

I flagged it. The contractor pushed back—said aluminum wraps had 'always' been done that way. That language, 'always,' is a red flag in my line of work. I suggested we switch to a complete Fypon PVC system for the headers, door surrounds, and even the new window trim they were planning. It wasn't just a material swap; it was a system change.

The Conversion: More Than Just a Headache

The switch wasn't seamless. The initial bid came back $4,700 higher than the aluminum plan. The contractor called me, frustrated. 'It's the same thing,' he said. I asked if he'd ever had to redo a wrap job because of a hidden rot issue. He got quiet for a second. He had.

That's the thing about a complete exterior architectural trim system like Fypon. It isn't just about replacing one part. It's about how the window header connects to the casing, how the casing meets the corner board, and how that entire assembly sheds water. With aluminum, you're essentially wrapping wood. If that wood isn't perfectly sealed—and on a house this old, it never is—you're praying the caulk holds. With a PVC system, the material itself is the barrier.

The project team eventually came around. We specified Fypon for the following:

• Window headers and surrounds – custom sizes to match the existing window stock.
• Door surrounds – including the sidelights on the front entry.
• Gable brackets – the originals were rotted and had to be replaced.
• Porch posts – we used their column wraps over pressure-treated lumber cores.

We also swapped the siding itself from vinyl to a PVC-based siding solution. But the story isn't about the siding. It's about the trim.

The Twist Nobody Expected

Here's where it got interesting. When the crew removed the old aluminum wraps around the front door, they found exactly what I feared. The wood underneath was damp—not saturated, but the moisture content was at 19%. Anything over 16% is a breeding ground for rot. The damage wasn't visible from the outside, but it was there, silently compromising the framing. The old installers had relied on caulk that had failed years ago.

If we had stuck with the original plan, we would have wrapped that damp wood in new aluminum. It would have looked fine for a year, maybe two. Then the paint would start bubbling. The homeowner would call, and we'd be looking at a $6,000 or $8,000 redo—plus the drywall repair inside because moisture always finds a way in.

Instead, the crew replaced the rotted wood, wrapped the posts and headers in Fypon PVC, and sealed the joints with the manufacturer's recommended butyl tape rather than standard caulk. That was another upgrade I insisted on.

The Result: Less Maintenance, Better Feel

The project wrapped up in late October. The house looked, for lack of a better term, clean. Not cheap, not flashy—just solid. The PVC material has a subtle matte finish that aluminum never achieves. The corner joints were crisp because the Fypon system uses mechanically interlocking connections, not just overlapping pieces.

But here's the part that made me keep this story in my file. The home inspector who did the final walk-through didn't catch the material change. I pointed it out. He was surprised. He said, 'I'd probably have passed this without noting it.' That's not a knock on him—it means the material replicated the look and feel of premium painted trim so well that a professional with 25 years of experience couldn't spot the difference without looking at the end grain.

From a quality perspective, that's the ideal outcome. The homeowner gets the aesthetic they wanted, but with dramatically improved resistance to moisture and insects. The contractor gets fewer callbacks. I get a project file I can close without feeling like I'm crossing my fingers.

What I Learned (and What I'd Do Differently)

I'm not saying every old aluminum wrap is a ticking time bomb. In drier climates, you could get 25 years out of them. But for a home in Germantown—which sees its share of rain and humidity—the upgrade was justified.

If I could go back, I would have insisted on the contractor taking moisture readings before the bid. If we had known the lumber was already at 19% moisture, the $4,700 cost premium for the Fypon system would have looked less like a premium and more like insurance against a catastrophic redo. An informed customer asks better questions and makes faster decisions. That's the takeaway.

I've seen this pattern many times. But when I say 'many,' I do not mean just a few—I mean consistently across dozens of projects. The cheapest fix on paper is rarely the cheapest fix over a 5- or 10-year horizon. This is why I'd rather spend 10 minutes explaining material options than deal with mismatched expectations two years later.

“The cheapest fix on paper is rarely the cheapest fix over a 5- or 10-year horizon.”

The Germantown project is a reference point for me now. When a contractor pushes back on a material spec, I ask them: 'Have you ever had a callback on a wrap job?' If they pause, I show them the photos from October.