Learning Center · Materials
Gutter Materials: Aluminum Gauge, Steel and Copper
Most gutters in Texas are painted aluminum, and the real choice is the thickness. This guide lays out aluminum 0.027 and 0.032, galvanized and Galvalume steel, and copper, from the makers’ own specifications, so you know what a bid means when it names a material.
Updated October 12, 2026
Read This First
The short version
- Seamless aluminum gutter coil comes in 0.027 and 0.032 inch, both 3105 H24 alloy with a baked on finish.
- Downspouts are thinner, 0.019 inch in one maker’s spec, and they dent and crush first.
- Galvanized and Galvalume steel gutters come in 24 and 26 gauge, and copper in 16 and 20 ounce weights.
- Dissimilar metals corrode each other, so an aluminum guard on a copper gutter or steel screws in aluminum need separation.
To talk through the right gutter metal for your house, start with Get Help or call or text 512-575-5052.
Short version: 2 min. Full page: 6 min. Want the detail? Each section below opens with a tap, or switch to Full at the top to open them all.
Direct Answer
Which gutter material is best in Texas?
Painted aluminum for most homes, 0.032 inch where hail and ladders matter, steel or copper for looks or loads.
Aluminum, for almost every house
Painted aluminum, for most homes. It does not rust, takes a factory finish, and rolls on site into a seamless run. The real decision is thickness: 0.027 inch is the common coil, and 0.032 inch is about 18 percent thicker and holds its shape better under ladders, limbs and hail. Steel and copper are chosen for a look or a historic home.
Manufacturer Spec
Aluminum gutters: 0.027 versus 0.032 inch
Both are 3105 H24 alloy; the thicker coil resists dents and sag and costs a little more per foot.
What the spec says
One national maker’s specification lists seamless gutter coil as 3105 H24 aluminum, in 0.027 or 0.032 inch thickness, with a two coat baked acrylic finish, and downspouts at 0.019 inch. The coil comes 11 7/8 inches wide for a 5 inch K-style gutter and 15 inches wide for a 6 inch, so the same thickness choice applies to either size.
Why thickness matters here
Hail and ladders dent gutters. A thicker gutter resists both and holds its fall better on a long run between hangers. The thin downspout is the piece that gets crushed by a mower or a car door, and it is the easiest piece to replace. Our hail damage guide covers what dented gutters mean for a claim.
Cost difference
The thicker coil costs more per foot, but the labor to roll and hang it is the same. On most homes the upgrade is a small share of the total. Ask any bid which thickness it prices, because a bid that does not say is usually 0.027.
Steel
Galvanized and Galvalume steel gutters
Steel is stiffer than aluminum and comes in 24 and 26 gauge, but a scratch through the coating can rust.
What it is
Galvanized steel is steel with a zinc coating, and Galvalume is steel with a zinc and aluminum coating. One sheet metal fabricator lists both in 24 and 26 gauge, with the lower number the thicker sheet. Steel resists dents and holds a long span, and a painted steel gutter can look like aluminum from the ground.
The trade
Steel rusts where the coating is cut, so every field cut, screw hole and scratch is a place to watch. Steel is also heavier, which the fascia has to carry. Stainless steel is sometimes asked for by name around Round Rock, and it is a special order fabricated from sheet rather than a stocked seamless coil, so it is priced on a walkthrough.
Copper
Copper gutters: 16 and 20 ounce
Copper is sold by weight per square foot, patinas over time, and must be kept away from aluminum and steel.
Weights and the patina
Copper gutter is sold by the weight of a square foot of sheet. 16 ounce is the standard, and 20 ounce is the heavier option. Copper does not rust and is not painted. It weathers from bright copper to brown and then green over the years, and the color change is the point for the homes that choose it. Soldered seams replace the sealant used on aluminum.
Keep other metals off it
Copper and aluminum or steel corrode each other where they touch and water runs between them. A gutter manufacturer’s spec requires dissimilar metals to be separated, and at least one micro-mesh guard maker voids its warranty if the guard contacts copper. Copper gutters get copper or brass hangers and compatible guards, or none.
Side by Side
The materials, side by side
Thickness, finish, how the joints are made and what to watch for, from the specifications above.
Read the row for your house
The table pulls the specification facts together. The right answer for most Round Rock homes is the first row, and the choice between its two thicknesses is the one worth making on purpose. Whatever you pick, the seamless versus sectional guide explains how the run is formed and joined, and our gutter service page shows what we install.
| Material | Common thickness | Finish | Joints | Watch for |
|---|---|---|---|---|
| Aluminum, seamless | 0.027 or 0.032 inch | Two coat baked acrylic | Sealant at corners, outlets and ends | Dents from hail and ladders, lost fall |
| Aluminum, sectional | Not stated on the retail listing we checked | Baked on paint | Connector and sealant every 10 feet | Leaks at the joints |
| Galvanized or Galvalume steel | 24 or 26 gauge | Coating, often painted | Sealed or soldered | Rust at cuts and scratches, weight |
| Copper | 16 or 20 ounce per square foot | None, natural patina | Soldered | Contact with aluminum or steel, cost |
Common Questions
Questions homeowners ask
Is 0.032 aluminum gutter worth it?
On a house that takes hail or has long runs, usually yes. The coil is about 18 percent thicker than 0.027, it resists dents and sag, and the labor to install it is the same. Ask which thickness a bid prices.
What gauge are aluminum gutters?
Aluminum gutter coil is measured in inches, not gauge: 0.027 and 0.032 inch are the two standard thicknesses in one national maker’s spec. Steel gutters are the ones measured in gauge, commonly 24 or 26.
Do steel gutters rust?
Galvanized and Galvalume steel resist rust through their coating. Where the coating is cut, at screw holes, field cuts and scratches, rust can start. Aluminum and copper do not rust.
Can you put aluminum gutter guards on copper gutters?
Not in direct contact. Dissimilar metals corrode each other, a gutter manufacturer’s spec requires separation, and at least one micro-mesh guard maker voids its warranty for contact with copper.
Are stainless steel gutters available in Round Rock?
As a special order, fabricated from sheet rather than rolled from a stocked coil, so they are priced on a walkthrough. For most homes painted aluminum does the job.
Keep Learning