5-Inch vs. 6-Inch Gutters: Which Size Does Your Tulsa Home Need?
5-inch vs. 6-inch gutters for Tulsa homes: capacity, cost, downspouts, and how roof size, pitch, valleys and trees decide which one your home needs.
The short answer: Five-inch K-style gutters handle most single-story and average-size Tulsa homes. Six-inch gutters carry roughly 40 to 50% more water and are the better choice for large or steep roofs, long runs, valleys that dump into one spot, and heavy tree cover. Downspout size and count matter as much as the gutter.
In this guide 13 sections
- What "5-Inch" and "6-Inch" Actually Mean
- How to Tell Which Size Your Home Needs
- Signs Your Current Gutters Are Too Small
- Downspouts Matter as Much as Gutter Size
- Seamless vs. Sectional
- Can You Mix Sizes on One House?
- Material Options
- Typical Tulsa Gutter Scenarios
- Common Gutter Sizing Mistakes
- Gutter Cost Examples
- Frequently Asked Questions About Gutter Sizes
- Get Gutters Sized for Your Roof
- Related Reading
Most homeowners never think about gutter size until they watch water pour over the front edge of a gutter during a Tulsa downpour. Then the question comes up fast: are my gutters too small?
The two standard residential sizes are 5-inch and 6-inch K-style gutters. Five-inch is the most common size on Tulsa homes. Six-inch carries a lot more water and is the right call more often than people expect in a place where a summer thunderstorm can drop two inches of rain in an hour.
This guide explains the real difference between 5-inch and 6-inch gutters, how to tell which one your home needs, what each costs in Tulsa, and why downspouts matter as much as the gutter itself.
What "5-Inch" and "6-Inch" Actually Mean
The number is the width across the top opening of a K-style gutter, the shape that looks like crown molding from the side and is the standard on most homes built since the 1970s.
An inch doesn't sound like much, but it isn't a 20% difference in capacity. Because the gutter is also deeper, a 6-inch K-style gutter carries roughly 40% to 50% more water than a 5-inch one. That's the difference between a gutter that keeps up with an Oklahoma downpour and one that overflows.
| 5-inch K-style | 6-inch K-style | |
|---|---|---|
| Relative capacity | Baseline | Roughly 40-50% more |
| Typical downspout | 2×3 inch | 3×4 inch |
| Best for | Most single-story and average-size homes | Large or steep roofs, long runs, heavy tree cover |
| Look from the street | Standard | Slightly larger profile; suits bigger homes |
| Typical installed cost in Tulsa | $9-$14 per linear foot (aluminum) | $12-$17 per linear foot (aluminum) |
How to Tell Which Size Your Home Needs
1. Roof area draining to each gutter
A gutter doesn't just catch rain falling on it; it catches everything running off the roof plane above it. A big, uninterrupted roof plane sends a lot of water to one gutter run. Two-story homes and homes with large rear slopes often need 6-inch on at least part of the house.
2. Roof pitch
Water moves faster off a steep roof. On a steep slope, it can shoot right over the front edge of a 5-inch gutter in a hard rain. Steeper roofs benefit from the extra width and depth of 6-inch.
3. Rainfall intensity
Gutter sizing is based on the heaviest rain a gutter needs to handle, not the average. Tulsa's spring and summer storms regularly produce short bursts of very heavy rain. That's why a gutter can work fine for months and then overflow during one storm.
4. Valleys
Where two roof planes meet in a valley, water concentrates and rushes into one spot of the gutter below. Overflow at the corner under a valley is one of the most common problems we see, and 6-inch gutters or a valley splash guard usually solves it.
5. Trees
Oaks, sweetgums and pines fill gutters fast. A wider gutter clogs less quickly and is easier to clean, and it pairs better with gutter guards.
Signs Your Current Gutters Are Too Small
- Water spills over the front edge during heavy rain even when the gutters are clean
- Overflow at inside corners, especially under valleys
- Erosion lines, splash marks or a trench in the mulch under the drip line
- Water staining on siding or brick below the gutter
- Wet basement, crawl space or foundation cracks on one side of the house
Make sure the gutters are actually clean before deciding they're undersized. A clogged downspout looks exactly like a gutter that's too small. Our guide to common gutter problems covers the other suspects.
Downspouts Matter as Much as Gutter Size
A gutter is only as good as the downspouts that empty it. Upsizing the gutter without upsizing or adding downspouts often just moves the overflow.
- Size: 6-inch gutters usually get 3×4 downspouts, which move far more water than standard 2×3.
- Count: A general guideline is a downspout every 30 to 40 feet of gutter, plus one near each valley that dumps a lot of water.
- Discharge: Water needs to land several feet from the foundation, not at the base of the wall. Extensions, splash blocks or underground drains handle that.
Our downspout guide goes deeper on placement and drainage.
Seamless vs. Sectional
Whatever size you choose, seamless gutters are the better choice for Tulsa homes. Sectional gutters are joined every 10 feet, and every joint is a future leak. Seamless gutters are formed on site from a coil of aluminum and cut to the exact length of each run, so the only seams are at the corners.
We form seamless gutters on site from our own trucks in both 5-inch and 6-inch. More detail in seamless vs. sectional gutters.
Can You Mix Sizes on One House?
Yes, and it's common. A house might run 5-inch along the front for a cleaner look and 6-inch on the back where a big roof plane drains. The transitions are handled at corners or downspouts. A good installer sizes each run for the water it carries rather than using one size everywhere.
Material Options
- Aluminum: The standard. Doesn't rust, comes in many colors, and is the most cost-effective.
- Steel: Stronger against ladders and falling limbs, but can rust over time once the coating is scratched.
- Copper: Premium, long-lasting, and weathers to a natural patina. We make copper gutters in-house; see copper gutters.
Typical Tulsa Gutter Scenarios
The two-story with a big back slope
A common South Tulsa and Jenks layout: a two-story home with a large, steep rear roof plane draining into one long back gutter. A 5-inch gutter there overflows in almost every hard storm, even when clean. Upsizing just that run to 6-inch with 3×4 downspouts usually ends it, while the front stays 5-inch for a cleaner look.
The overflowing corner under a valley
Water from two roof planes meets in a valley and slams into one inside corner of the gutter. The rest of the gutter is fine; that corner pours over in every storm and digs a trench in the flower bed. A valley splash guard, a downspout near the corner, or a 6-inch section usually fixes it.
The ranch home that's fine with 5-inch
A single-story Broken Arrow ranch with a moderate pitch, short runs and a downspout at each corner. Five-inch seamless gutters handle it easily. Upsizing would add cost without solving a real problem.
Common Gutter Sizing Mistakes
- One size everywhere. Each run should be sized for the roof area and pitch that drains into it.
- Bigger gutters, same downspouts. If the downspouts can't keep up, the gutter still overflows.
- Too little slope. Gutters need a slight pitch toward downspouts, about a quarter inch per 10 feet, or water stands and debris settles.
- Hangers spaced too far apart. Wider, heavier 6-inch gutters full of water and leaves need solid hangers, typically every 2 feet or so.
- Dumping at the foundation. Downspout water needs to discharge several feet away from the house.
Gutter Cost Examples
| Home | Approx. linear feet | 5-inch aluminum | 6-inch aluminum |
|---|---|---|---|
| Small ranch | 120 ft | $1,080-$1,680 | $1,440-$2,040 |
| Average two-story | 180 ft | $1,620-$2,520 | $2,160-$3,060 |
| Large home | 250 ft | $2,250-$3,500 | $3,000-$4,250 |
Ranges are illustrative, based on typical Tulsa-area per-foot pricing, and exclude copper, guards and extra downspouts. See gutter installation costs for more.
Frequently Asked Questions About Gutter Sizes
What size gutters are standard in Tulsa?
Five-inch K-style aluminum gutters are the most common on Tulsa homes. Six-inch is common on larger, two-story and steep-roofed homes.
Are 6-inch gutters worth it?
If you have a large or steep roof, long gutter runs, valleys dumping into one spot, or heavy tree cover, usually yes. They carry roughly 40 to 50% more water and clog less quickly.
How much more do 6-inch gutters cost?
In the Tulsa area, 6-inch aluminum typically runs about $12 to $17 per linear foot installed, compared with $9 to $14 for 5-inch.
Will bigger gutters fix overflowing?
Only if the gutters are truly undersized. Overflow is often caused by clogged downspouts, poor slope, or too few downspouts. Check those first.
Do gutter guards work with 6-inch gutters?
Yes. Most gutter guard systems are made for both 5-inch and 6-inch gutters. Ask your installer to confirm the guard fits your gutter size before you order.
Get Gutters Sized for Your Roof
When we quote gutters, we measure each run, look at the roof planes and valleys above it, and size the gutter and downspouts for the water that run actually carries. Then we form seamless gutters on site, cut to your home's exact lengths. See our seamless gutters page, or book a free gutter inspection.
We install gutters across Tulsa, Broken Arrow, Owasso, Jenks, Bixby and Coweta.
Related Reading
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Sources and disclaimer. Information in this article comes from manufacturer documentation for the products named and RainTech’s own gutter installation experience. It was current as of September 25, 2026; laws, insurance rules, manufacturer terms and prices change. This article is general information, not legal, insurance, tax or financial advice.
