# Steel vs. Aluminum Roofing: Which Fits a Boise Home?

> A direct comparison of steel and aluminum metal roofing for Boise, Idaho — cost, corrosion resistance, weight, and when each makes more sense in an inland climate.

URL: https://metalroofingboise.net/guide/steel-vs-aluminum-roofing/

Steel is the more common, typically more economical choice in Boise's inland climate, running $10-16/sq ft versus aluminum's $11-17/sq ft. Aluminum is worth considering mainly for weight-sensitive structures or properties with heavy irrigation overspray, since its main advantage — coastal corrosion resistance — matters less here than near an ocean.

## The core difference

Both steel and aluminum are common, well-established metal roofing materials, and the choice
between them comes down to a handful of practical factors rather than one being objectively
"better." Steel is the default choice in most inland U.S. markets, including Boise; aluminum is
more common in coastal regions where its natural corrosion resistance is the deciding factor.

## Cost comparison

| | Steel | Aluminum |
|---|---|---|
| Installed cost (standing seam) | $10-16/sq ft | $11-17/sq ft |
| Installed cost (exposed-fastener) | $7-12/sq ft | Similar range, less common |
| Weight | Heavier | Roughly 1/3 lighter than steel |
| Corrosion resistance | Good with proper Galvalume/galvanized coating | Naturally superior, especially in salt-air/coastal environments |
| Denting resistance | Better at comparable gauge | Softer; dents more easily unless heavier gauge is used |

## Why steel is the practical default here

Boise's inland, low-humidity climate doesn't demand aluminum's signature advantage — coastal
corrosion resistance — the way a marine environment would. A properly coated steel panel
(Galvalume AZ50 or G90 galvanized) performs reliably in this climate for decades, at a typically
lower cost than aluminum. That's why the large majority of metal roofs installed in the Treasure
Valley are steel.

## When aluminum is worth considering

- **Weight-sensitive structures.** Aluminum's lighter weight matters on older framing or
  accessory structures where reducing roof load is a real structural consideration, not just a
  preference.
- **Heavy irrigation overspray.** Properties where sprinkler systems consistently mist a lower
  roof or valley section see real value in aluminum's superior corrosion resistance, since even
  Galvalume-coated steel can show premature edge wear under sustained moisture exposure.
- **Specific finish or color preferences.** Some finish options and color ranges are more readily
  available or perform differently on aluminum versus steel — worth discussing if you have a
  specific aesthetic goal.

## Galvanic corrosion: the reason not to mix them casually

When steel and aluminum come into direct contact with moisture present, a galvanic reaction can
accelerate corrosion at the contact point — a real consideration for gutters, flashing, and
fastener choices anywhere the two metals might touch. This is a detail we account for
specifically in fabrication and hardware selection, not something to leave to chance.

## Bottom line

For most Boise-area homes, steel is the practical, cost-effective default — Galvalume or better
resists this climate's conditions well, at a lower cost than aluminum. Aluminum earns its keep on
weight-sensitive structures or properties with real irrigation-overspray exposure. We'll walk
through which fits your specific situation at the free on-site estimate. Call
**(208) 279-6903**.

## FAQ

**Does aluminum dent more easily than steel under hail?**

Aluminum is a softer metal than steel, so a lighter-gauge aluminum panel can dent more easily under comparable hail impact than a similar-gauge steel panel. Choosing a heavier gauge aluminum panel closes most of that gap.

**Is aluminum worth the extra cost in a climate like Boise's?**

For most homeowners, the modest cost premium isn't justified purely by corrosion resistance in this inland climate. It becomes worth it for specific situations — weight-sensitive older framing, or a property with consistent sprinkler overspray on a lower roof section.

**Can steel and aluminum be mixed on the same property?**

Generally not recommended in direct contact — mixing steel and aluminum where they touch, especially with moisture present, creates a galvanic corrosion risk. If your property has both (e.g., a steel house roof and aluminum gutters), the transition detail matters and should be engineered specifically to avoid direct contact corrosion.