By The Roofing Brief Team | Last reviewed: October 2026
Mini gutters are narrow gutters, roughly 1-1/2 to 3 inches wide, made for small roofs: sheds, single-wide mobile homes, tiny houses, porches, bay windows, pergolas and RVs. The narrowest ones are steel or aluminum channels sold by mobile home parts suppliers for about $21 to $29 per pack, and they usually have no downspout. Whether one is enough depends on the roof area draining to it and your local rainfall, and the arithmetic takes about a minute.
The pages ranking for this search are mostly product listings and videos, and none of them shows how much water a mini gutter can carry. This guide does: it uses the International Plumbing Code (IPC) gutter table, a UK maker’s published mini-gutter rating, and NOAA Atlas 14 rainfall for eight US cities to show which small roofs a mini gutter can actually handle. For gazebos specifically, see our separate gazebo gutters guide.
Key numbers at a glance
These are the figures most people want before buying a mini gutter: the sizes sold, what they cost, how much water a small roof sheds, and the smallest gutter the plumbing code rates. Prices were checked in October 2026 and change often, so treat them as planning figures, not quotes.
| Figure | Value | Source |
|---|---|---|
| Mobile home mini gutter size | 1-1/2 in. wide, 2 in. front, 2-1/2 in. back, 144 in. long (Mobile Home Parts Store); 1-3/4 in. wide x 2-3/4 in. high (Mobile Home Depot) | mobilehomepartsstore.com part 570410; mobilehomedepotmi.com SKU 207812C, October 2026 |
| Mini gutter price | $20.69 to $28.82 per listing (two 5 ft, two 6 ft, two 84 in., or one 12 ft piece) | R&G Supply, Mobile Home Parts Store, Mobile Home Depot listings, October 2026 |
| Water shed by a small roof | 0.62 gallons per square foot per inch of rain (about 75 gallons from a 10 x 12 ft roof) | USGS Water Science School: 1 in. of rain on 1 acre is about 27,154 gallons |
| Smallest gutter in the plumbing code | 1-1/2 x 2-1/2 in.: 26 gpm at 1/4 in. per ft slope, 40 gpm at 1/2 in. per ft | IPC Table 1106.6, Horizontal Gutter Sizing (2015 and later editions) |
| UK 76 mm (3 in.) mini gutter rating | Up to 20 square meters (about 215 sq ft) of roof per outlet | FloPlast Rainwater Systems brochure, MiniFlo page (center outlet, 1:350 fall, 75 mm/hr UK design rain) |
| Design rainfall range, 8 US cities | 1.63 in./hr (Los Angeles) to 5.22 in./hr (Miami), 100-year, 60-minute | NOAA Atlas 14 Precipitation Frequency Data Server, accessed October 2026 |
What are mini gutters?
Mini gutters are small open channels that catch roof runoff at an eave, usually 1-1/2 to 3 inches wide versus the 5 or 6 inch K-style gutters on most houses. They come in three families: mobile home mini gutters (steel or aluminum, often with no outlet), small vinyl gutters around 4 to 4-1/2 inches, and 76 mm (3 inch) half-round PVC systems made in the UK for sheds and greenhouses.
The mobile home type is the one most people mean. Mobile Home Parts Store describes its 12 ft mini gutter as “ideal for channeling water away from doors and windows” and says it is “commonly used as a roof gutter on singlewide homes,” as well as on porches, garages and sheds. Its own Q&A says the profile is too small to attach a downspout, so water runs out the open end. That design choice explains most of what follows: a mini gutter moves a drip line sideways, it does not pipe water away.
People also call these drip gutters, awning gutters or rain diverters, though a rain diverter is technically a different part: a bent strip fastened on the roof surface that turns water sideways before it reaches the edge.
Mini gutter sizes and materials compared
The mini gutters sold in the US range from a 1-1/2 inch steel channel to a 4-1/2 inch vinyl gutter, and each has a different job. The narrow mobile home profiles are drip control with no downspout. The 4 to 4-1/2 inch vinyl gutters take standard end caps and outlets. The 76 mm UK systems include matched brackets, outlets and a 50 mm downpipe.
| Product (as listed) | Profile and size | Material | Downspout? | Price (Oct 2026) | Source |
|---|---|---|---|---|---|
| Mini Gutter, part 570410 | 1-1/2 in. wide; 2 in. front, 2-1/2 in. back; 144 in. long; white only | Described as both steel and aluminum on the listing | No; the seller says it is too small for a downspout | $24.99 | mobilehomepartsstore.com |
| Gutter, Mini (Pre-Cut), SKU 207812C | 1-3/4 in. wide x 2-3/4 in. high; 2 pieces x 84 in.; colonial white, white, rich brown | Metal (not stated) | Not listed | $28.82 | mobilehomedepotmi.com |
| “Amerimax” Steel Mini-Gutter, (2) 6 ft lengths | Back wall 2-13/16 in., front wall 1-9/16 in.; 1-3/4 in. wide at top, 3/4 in. at bottom | Steel; white, cream, dark brown, clear | No; seller offers no corners, downspouts or connectors | $21.29 | randgsupply.com |
| “Amerimax” Galvanized Steel Mini-Gutter, (2) 5 ft lengths | Mini gutter profile | Galvanized steel | No | $20.69 | R&G Supply listing via Google Shopping |
| Amerimax 4 in. x 10 ft White Vinyl U-Style Gutter | 4 in. U-style, 10 ft | Vinyl | Yes; outlet fittings sold separately | $9.58 | Lowe’s listing via Google Shopping |
| KP U-Snap 4-1/2 in. x 10 ft White Vinyl Gutter | 4-1/2 in. U-style, 10 ft | Vinyl | Yes; U-Snap fittings sold separately | $6.79 | Menards listing via Google Shopping |
| FloPlast MiniFlo 76 mm gutter | 76 mm (3 in.) wide x 38 mm deep half-round; 2 m lengths | PVC-U (BS EN 607) | Yes, 50 mm round downpipe | Not priced in US; sold through UK merchants | FloPlast Rainwater Systems brochure |
Two details on these listings matter for planning. The narrow mobile home profiles are sold as straight lengths with no end caps, corners or outlets, so you seal and overlap them yourself. Mobile Home Parts Store lists 3/4 inch butyl tape and hex head screws as the materials needed and says sections join by overlapping and screwing, with silicone sealant at the seam.
How much water can a mini gutter carry?
A mini gutter can carry only a few gallons per minute. The smallest gutter in IPC Table 1106.6 is a 1-1/2 x 2-1/2 inch rectangle rated at 26 gallons per minute at a 1/4 inch per foot slope. FloPlast rates its 76 mm mini gutter for 20 square meters of roof at UK design rainfall, which works out to about 6.6 gallons per minute. Narrow mobile home profiles have no published rating.
The method is the same for any gutter. Roof runoff in gallons per minute equals the roof area draining to the gutter (measured flat, as a footprint) times the rainfall rate in inches per hour times 0.0104. That constant comes from the USGS figure of 27,154 gallons per inch of rain on an acre: 27,154 divided by 43,560 square feet is 0.623 gallons per square foot per inch, and dividing by 60 minutes gives 0.0104.
IPC Section 1106.1 bases storm drainage sizing on the 100-year, 1-hour rainfall rate, so that is the rate used below. Short bursts are much heavier: NOAA Atlas 14 puts Houston’s 100-year, 5-minute intensity at 15.3 inches per hour, about three times its hourly rate. Expect any small gutter to spill briefly in a cloudburst.
Worked example: a 10 x 12 ft lean-to shed in Houston
A 10 x 12 ft lean-to shed in Houston sends about 6 gallons per minute to one gutter in a 100-year hourly storm. That is less than the IPC rating for a 1-1/2 x 2-1/2 inch gutter, roughly the FloPlast mini rating, and within our estimate for a narrow mobile home mini gutter hung at 1/8 inch per foot, with little margin.
| Step | Calculation | Result | Source |
|---|---|---|---|
| 1. Roof area draining to the gutter | 10 ft x 12 ft, single slope, footprint measure | 120 sq ft | Example shed |
| 2. Design rainfall | 100-year, 60-minute intensity, Houston | 4.85 in./hr | NOAA Atlas 14 Vol. 11 |
| 3. Runoff | 120 x 4.85 x 0.0104 | About 6.0 gpm | USGS conversion |
| 4. Compare to a 1-1/2 x 2-1/2 in. code gutter | 26 gpm at 1/4 in. per ft | Passes with a wide margin | IPC Table 1106.6 |
| 5. Compare to a 76 mm UK mini gutter | 20 m2 x 75 mm/hr = 1,500 liters per hour | About 6.6 gpm: right at the limit | FloPlast brochure |
| 6. Compare to a mobile home mini gutter | Roofing Brief estimate (method below) | About 8 to 12 gpm depending on slope | Roofing Brief estimate |
The mobile home estimate is our own arithmetic, not a rating. Using the R&G Supply dimensions, the channel holds about 1.95 square inches of water below its 1-9/16 inch front wall, about half the 3.75 square inches of the code’s 1-1/2 x 2-1/2 inch rectangle. Scaling the code’s 26 gpm by Manning’s open-channel flow equation (flow rises with area and with hydraulic radius to the 2/3 power) gives about 12 gpm at 1/4 inch per foot and 8.5 gpm at 1/8 inch per foot. Dents, debris, or an open end that lets water sheet off early will lower it.
Largest roof area per gutter, by city
The table below turns each rating into the largest roof area one gutter run can serve in eight US cities. The code-rated 1-1/2 x 2-1/2 inch gutter covers 479 to 1,535 square feet. The 76 mm mini gutter covers 122 to 390 square feet, and a narrow mobile home mini gutter at 1/8 inch per foot covers an estimated 157 to 503 square feet.
| City | 100-yr, 1-hr rain (in./hr) | Mobile home mini gutter, 1/8 in./ft (est. 8.5 gpm) | FloPlast 76 mm (6.6 gpm) | IPC 1-1/2 x 2-1/2 in., 1/4 in./ft (26 gpm) | IPC 4 in. half-round, 1/8 in./ft (39 gpm) | Source |
|---|---|---|---|---|---|---|
| Miami, FL | 5.22 | 157 sq ft | 122 sq ft | 479 sq ft | 719 sq ft | NOAA Atlas 14 PFDS; IPC Table 1106.6; FloPlast; Roofing Brief arithmetic (gpm divided by rain rate x 0.0104) |
| Houston, TX | 4.85 | 169 sq ft | 131 sq ft | 516 sq ft | 774 sq ft | |
| Atlanta, GA | 3.25 | 252 sq ft | 196 sq ft | 770 sq ft | 1,155 sq ft | |
| Chicago, IL | 3.08 | 266 sq ft | 206 sq ft | 813 sq ft | 1,219 sq ft | |
| Boston, MA | 2.62 | 313 sq ft | 243 sq ft | 955 sq ft | 1,433 sq ft | |
| Denver, CO | 2.26 | 363 sq ft | 281 sq ft | 1,107 sq ft | 1,661 sq ft | |
| Phoenix, AZ | 2.00 | 410 sq ft | 318 sq ft | 1,251 sq ft | 1,877 sq ft | |
| Los Angeles, CA | 1.63 | 503 sq ft | 390 sq ft | 1,535 sq ft | 2,303 sq ft |
The IPC and FloPlast figures differ by about four times for similar-sized gutters. They come from different methods and slopes: the UK figure follows BS EN 12056-3, which adds a wind allowance to the roof area, FloPlast’s published flow tables use 90 percent of full flow as a safety factor, and the rating assumes a nearly level 1:350 fall instead of 1/4 inch per foot. When in doubt, plan from the smaller number. For house-sized gutters, use our gutter size chart and drainage-area method.
Which small roofs can a mini gutter handle?
A mini gutter suits a door hood, bay window, small shed, tiny house or porch roof, because each sheds well under 10 gallons per minute even in a Houston design storm. A single-wide mobile home is the stretch case: one 70 ft eave can send 12 gallons per minute to each open end, more than our estimate for a narrow mini gutter.
| Structure (example size) | Roof area to one gutter | Runoff, Houston (4.85 in./hr) | Runoff, Chicago (3.08 in./hr) | Runoff, Phoenix (2.00 in./hr) | Mini gutter verdict |
|---|---|---|---|---|---|
| Door hood or bay window roof, 3 x 8 ft | 24 sq ft | 1.2 gpm | 0.8 gpm | 0.5 gpm | Easily handled |
| 8 x 10 ft gable shed, one side | 40 sq ft | 2.0 gpm | 1.3 gpm | 0.8 gpm | Easily handled |
| 6 x 16 ft porch roof | 96 sq ft | 4.8 gpm | 3.1 gpm | 2.0 gpm | Handled; add a downspout if it spills onto steps |
| Tiny house on wheels, 8.5 x 24 ft gable, one side | 102 sq ft | 5.1 gpm | 3.3 gpm | 2.1 gpm | Handled at 1/8 in. per ft or steeper |
| 10 x 12 ft lean-to shed | 120 sq ft | 6.0 gpm | 3.8 gpm | 2.5 gpm | Near the limit in Gulf Coast rain |
| Single-wide home, 14 x 70 ft gable, half of one eave to each open end | 245 sq ft per end | 12.3 gpm | 7.8 gpm | 5.1 gpm | Overflows in design storms on the Gulf Coast; fine in ordinary rain |
Runoff figures are Roofing Brief arithmetic: area x NOAA Atlas 14 100-year, 1-hour rate x 0.0104. Measure your own roof footprint including overhangs, which add area. In ordinary rain the margins are much wider. Houston’s 2-year, 1-hour rate is 2.23 inches per hour, which drops the single-wide eave to about 5.7 gallons per minute per end.
Mini gutters by structure
Each small structure has its own constraint: a shed often has no fascia, a mobile home has a metal roof edge, a tiny house has a road-width limit, and an RV already has a drip rail. The structure decides the mounting method and whether you need a downspout more than the roof size does. The sections below cover each one.
Sheds and greenhouses
Shed gutters are worth adding when the drip line falls against the shed’s own base, a path, or a fence, or when you want to fill a rain barrel. FloPlast sells a MiniFlo Half Shed Pack (code MS1) sized for one side of a standard 6 ft shed: two 1 m gutters, a stopend outlet, two 1 m downpipes and a rain diverter. In the US, a 4 or 4-1/2 inch vinyl U-style gutter cut to length does the same job for under $30 in parts.
Resin and metal kit sheds often have no wood fascia to screw into, so brackets go into the roof edge or wall framing instead. To route the water into storage, see our guide to connecting a gutter to a rain barrel. For the roof itself, our shed roof guide covers slope and materials.
Mobile and manufactured homes
Mobile home mini gutters screw along the roof edge with butyl tape behind them and drain out their open ends. They are cheap and low-profile, but on a long single-wide eave they can overflow in heavy storms, as the table above shows. If water at the ends lands against skirting or piers, a 4 to 5 inch gutter with a downspout carries more.
On single-wides with little or no roof overhang, the narrow profile fits under the roof edge without projecting far. Our mobile home roof guide covers roof edges, coatings and replacement.
Tiny houses on wheels
On a tiny house on wheels, the gutter adds width, and width is regulated. Federal rules (23 CFR 658.15) set a 102 inch limit for vehicles on the National Network. For commercial vehicles, 23 CFR 658.16 excludes non-cargo devices that stick out no more than 3 inches per side. State rules for private towing vary, so confirm your state’s limit before adding any gutter.
A 1-1/2 to 1-3/4 inch mini gutter adds less than that 3 inch figure, which a 5 inch K-style gutter cannot. Road travel may also favor screwed and sealed gutters over snap-in hangers, and for removable downspout sections that come off before a move.
RVs and travel trailers
Many RVs already have a drip rail along the roof edge with short spouts at the corners, so the usual upgrade is a longer spout, not a new gutter. Camco’s 42123 clip-on extensions add 2 inches of projection and sell in 4-packs for $9.80 at RVUpgradeStore. RecPro’s long gutter spouts are 3-1/2 inches long, from $10.95. Both aim to keep dirty roof water off the sidewall, where it leaves black streaks.
For roof cleaning and sealant checks that reduce those streaks at the source, see our RV roof maintenance schedule.
Bay windows, door hoods, porches and pergolas
Bay window roofs and door hoods shed so little water, about 1 gallon per minute in a Houston design storm, that a mini gutter or a rain diverter handles them easily. FloPlast lists bay windows as a MiniFlo use. Porch roofs and solid pergola roofs are larger, around 100 square feet, and are still within mini gutter range, but a gutter over steps or a walkway works better with a downspout than an open end.
How to install a mini gutter
Installing a mini gutter takes a drill, tin snips, sealant and a level. The main steps are to set a slope line, fasten the gutter under the roof edge so water cannot run behind it, seal every overlap, and decide where the open end or outlet discharges.
- Measure the eave and the roof area. Record the eave length and the footprint draining to it, including overhang, and check it against the capacity tables above for your city.
- Pick the low end. Choose the end where water can land harmlessly or where a downspout or rain barrel will sit. On a long eave, pitch both halves toward the two ends.
- Snap a slope line. Mark a line falling toward the low end. A 1/8 inch per foot fall drops 1-1/2 inches over 12 feet; a 1/4 inch per foot fall drops 3 inches. FloPlast recommends 1:350, which is only about 0.4 inch over 12 feet, but steeper slopes carry more water. Our gutter slope guide covers the tradeoffs.
- Cut the gutter on the ground. Cut lengths with tin snips or a fine-tooth saw. Plan overlaps of a few inches at joints for mobile home profiles, or union brackets for systems that have them.
- Prepare the mounting surface. For mobile home mini gutters, run 3/4 inch butyl tape along the back flange. For bracket systems, fasten brackets to the fascia: FloPlast specifies a maximum 1 m (about 39 in.) spacing, 400 mm (about 16 in.) in heavy-snow areas, and a bracket within 150 mm of every angle and stopend.
- Hang the gutter under the roof edge. Set the back of the gutter under the drip edge or roof panel so water falls into the channel, then fasten through the back flange with hex head screws.
- Seal the joints and ends. Overlap sections in the direction of flow and seal with silicone or gutter sealant. Add end caps where the system has them; mobile home profiles are often left open at the low end.
- Add the outlet or discharge point. On 4 inch and larger vinyl gutters, cut in a drop outlet and run a 2 x 3 inch downspout. On open-ended mini gutters, put a splash block or gravel pocket where the stream lands.
- Test with a hose. Run water on the roof and check for drips at seams, water behind the gutter, and overshoot at the end.
What do mini gutters cost?
Mini gutter materials for one small eave usually cost $20 to $60. Mobile home mini gutter packs run $20.69 to $28.82, vinyl U-style gutters $6.79 to $9.58 per 10 ft section, and a 10 ft vinyl downspout about $15, based on October 2026 listings. Rain diverters, the cheapest workaround, cost about $21 to $25 per piece.
| Item | Price (Oct 2026) | Retailer / source |
|---|---|---|
| Mobile home mini gutter, 12 ft | $24.99 | Mobile Home Parts Store, part 570410 |
| Mobile home mini gutter, 2 x 84 in., pre-cut | $28.82 | Mobile Home Depot, SKU 207812C |
| Steel mini gutter, 2 x 6 ft | $21.29 | R&G Supply |
| Vinyl U-style gutter, 4 in. x 10 ft | $9.58 | Lowe’s (Amerimax), via Google Shopping |
| Vinyl U-Snap gutter, 4-1/2 in. x 10 ft | $6.79 | Menards (KP), via Google Shopping |
| Vinyl downspout, 2 x 3 in. x 10 ft | $14.98 | Home Depot (Amerimax), via Google Shopping |
| Aluminum rain diverter | $24.99 (Amerimax 5402000060); $20.99 (7-1/2 x 2-5/8 in. x 5 ft) | Ace Hardware; Menards, via Google Shopping |
| RV gutter spout extensions | $9.80 per 4-pack (Camco 42123); from $10.95 (RecPro long spouts) | RVUpgradeStore; recpro.com |
As a Roofing Brief estimate, a 12 ft shed eave with a 4 inch vinyl gutter costs about $45 in parts: two 10 ft sections ($19.16), one 10 ft downspout ($14.98), plus end caps, a drop outlet and hangers at roughly $10 to $15. The same eave with a mobile home mini gutter costs $24.99 plus butyl tape and screws, with no downspout.
Cheaper alternatives to mini gutters
The cheapest alternatives to a mini gutter are a rain diverter over a door, a drip edge that throws water clear of the wall, a gravel drip line under the eave, or a rain chain. Each manages where water lands without a gutter run. They suit small structures where the only problem is a splash zone or a drip over an entry.
- Rain diverter: a bent aluminum strip fastened on the roof above a door that turns water sideways. Listings run about $21 to $25.
- Drip edge or roof edge flashing: one of the top-ranking videos for this search uses roof edge flashing as a low-profile gutter substitute on a gazebo. See our drip edge guide for profiles.
- Gravel drip line: a trench of stone under the eave that stops splash-back and erosion.
- Rain chain: hangs from an outlet and guides a small flow to the ground.
Our full comparison of gutter alternatives covers costs and when each one fails.
Which mini gutter should you pick?
Pick by roof area and by where the water must go. If the roof is under about 100 square feet and the water can land at the end of the eave, a mobile home mini gutter is the low-profile choice. If you need a downspout or a rain barrel, use a 4 to 4-1/2 inch vinyl gutter. On a long eave in heavy-rain country, step up to 5 inches.
| Your situation | Usual pick | Why |
|---|---|---|
| Drip over one door or window | Rain diverter or a short mobile home mini gutter | Moves a small flow sideways; no downspout needed |
| Shed side under about 100 sq ft, water can land at the end | Mobile home mini gutter | Low profile, $21 to $29 per pack, within capacity in most US cities |
| Shed or porch where you want a rain barrel or a downspout | 4 to 4-1/2 in. vinyl U-style gutter | Takes a drop outlet and a 2 x 3 in. downspout |
| Tiny house on wheels | Mobile home mini gutter, screwed and sealed | Projects under 3 in.; no hangers to rattle loose on the road |
| RV with factory drip rails | Clip-on or long gutter spouts | Throws water past the sidewall to stop black streaks |
| Single-wide home in the Southeast or Gulf Coast | 5 in. gutter with downspouts, or accept overflow in big storms | A 70 ft eave can exceed a mini gutter’s estimated capacity |
| Gazebo or pavilion | See our gazebo gutters guide | Kits and post downspouts are a separate topic |
Frequently asked questions
Do they make mini gutters?
Yes. Mobile home parts suppliers sell mini gutters about 1-1/2 to 1-3/4 inches wide, such as Mobile Home Parts Store part 570410 (12 ft, $24.99) and Mobile Home Depot SKU 207812C (two 84 inch pieces, $28.82) in October 2026. Small 4 to 4-1/2 inch vinyl gutters and UK-made 76 mm systems such as FloPlast MiniFlo are also sold for sheds and greenhouses.
What is the smallest gutter size you can buy?
The smallest gutters sold are mobile home mini gutters about 1-1/2 inches wide with walls about 2 to 2-1/2 inches high. They usually have no downspout and drain out an open end. The smallest gutter in IPC Table 1106.6 is 1-1/2 x 2-1/2 inches, rated at 26 gallons per minute at a 1/4 inch per foot slope.
Do they make gutters for sheds?
Yes. FloPlast sells a MiniFlo Half Shed Pack for one side of a standard 6 ft shed, with 76 mm gutter, outlet, downpipe and a rain diverter. In the US, a 4 inch or 4-1/2 inch vinyl U-style gutter cut to length, or a mobile home mini gutter, does the same job. A 10 x 12 ft shed roof sheds about 6 gallons per minute in a Houston design storm.
Is there a cheaper alternative to gutters?
Yes. A rain diverter over a door costs about $21 to $25, and a drip edge, a gravel drip line, or a rain chain can also manage where water lands. These work on small structures where the problem is splash or a drip over an entry. They do not move water away from a foundation the way a gutter and downspout do.
How do you make a mini gutter?
You can make a mini gutter by cutting a 4 inch vinyl gutter to length, by fastening roof edge flashing or a rain diverter along the eave, or by bending aluminum gutter coil on a brake. Whatever you use, set it under the roof edge, slope it 1/8 to 1/4 inch per foot, and seal overlaps with silicone or gutter sealant.
What is the smallest downspout size?
The smallest leaders in IPC Table 1106.3 are 2 inch round, 2 x 2 inch, and 1-1/2 x 2-1/2 inch, each rated at 30 gallons per minute. FloPlast’s MiniFlo system uses a 50 mm round downpipe. Narrow mobile home mini gutters usually take no downspout; one seller says its profile is too small to attach one.
What size gutters does a mobile home need?
Many single-wide homes use 1-1/2 to 1-3/4 inch mini gutters screwed to the roof edge with butyl tape, which handle ordinary rain. On a 70 ft eave in the Southeast or Gulf Coast, a 100-year storm can send about 12 gallons per minute to each open end, beyond a mini gutter’s estimated capacity, so a 5 inch gutter with downspouts carries more.