When you're shopping for new gutters in Des Moines, you'll encounter two main types: seamless and sectional. Most gutter contractors push seamless ā and for good reason ā but understanding the actual differences helps you make an informed choice.
What Are Sectional Gutters?
Sectional gutters come in pre-cut lengths (typically 10 feet) that are connected together on-site with slip joints and sealant. The joints are the defining characteristic ā a typical 150-foot home might have 15+ joints in its gutter system. Every joint is a potential leak point.
Sectional gutters are what you find at home improvement stores. They can be installed DIY and are less expensive upfront. Many older Des Moines homes still have the original sectional aluminum gutters installed decades ago ā and many of them are leaking at every joint.
What Are Seamless Gutters?
Seamless gutters are fabricated on-site from a continuous coil of aluminum using a machine mounted in a contractor's truck. Each run is formed to the exact length needed ā no mid-run joints. Joints exist only at corners and downspout outlets.
This is the standard for professional gutter installation across Des Moines today. Almost every gutter contractor in the metro installs seamless aluminum.
Head-to-Head Comparison
| Factor | Seamless | Sectional |
|---|---|---|
| Leak risk | Low ā minimal joints | High ā joint every 10 feet |
| Lifespan | 20ā30 years | 10ā20 years |
| Installed cost (Des Moines) | $4ā$9/ft | $3ā$6/ft (installed) |
| DIY friendly | No ā requires machine | Yes ā available at stores |
| Appearance | Clean, continuous look | Visible joints every 10 feet |
| Custom length | Yes ā exact fit always | No ā cut to fit with waste |
| Iowa winter performance | Better ā fewer ice dam entry points | Worse ā joints fail under ice load |
The joint problem in Iowa: Every winter, ice in gutters expands and contracts. Sectional gutter joints flex under this movement ā eventually separating. This is why Des Moines homes with 1970sā90s sectional gutters almost always have leaking seams today. It's not a product failure; it's the natural outcome of Iowa winters over time.
When Sectional Gutters Make Sense
Honestly, almost never for a permanent installation. The cost difference between sectional and seamless is modest, and the lifespan and leak advantages of seamless pay for the premium many times over. The main case for sectional is a small repair where replacing a single section is more economical than a full run ā and we do this regularly.
What Gauge Aluminum Matters Too
Both seamless and sectional gutters come in different aluminum gauges. Standard is .027 gauge. Premium is .032 gauge ā about 20% thicker and noticeably more rigid. For Iowa's winter ice loads, upgrading to .032 gauge is worth considering, especially for north-facing runs that hold ice longest.
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Bottom Line
For any permanent gutter installation in Des Moines, seamless aluminum is the clear choice ā fewer leaks, longer lifespan, better Iowa winter performance, and a cleaner appearance. The modest cost premium over sectional is recovered in lifespan alone.