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What size are gutter downspouts?

3 min read

Asked by: Clint Maile

The most common gutter sizes are 5 inches and 6 inches, although 4 inches is available as well. Downspouts are commonly 2 x 3 inches and 3 x 4 inches in size or 3 or 4 inches in diameter.

What is the standard size gutter downspout?

5 inches and 6 inches gutters are the most common sizes installed for residential use. However, 7, and 8 inches are available although the larger sizes are more suitable for larger buildings or business properties. As far as downspouts go, they run at 2″x3″ and 3″x4″ in size or 3 or 4 inches in diameter.

How do you tell if I have 5 or 6 inch gutters?


So there's actual 3-inch difference in the material. Whenever it starts out and you can see right here this if you come a little closer this is the 5 inch gutter.

How do you measure a gutter downspout?

How to Determine Gutter Dimensions for Your Home

  1. Calculate square footage of the roof surface. Measure the lengths and widths of each area of your roof. …
  2. Get the pitch of your roof. …
  3. Multiply the roof square footage by a number determined by the roof pitch. …
  4. Use the resulting number to choose gutter measurements.


Can you put a 3×4 downspout on a 5 inch gutter?

5” gutters typically get the 2×3” downspout, so be aware that if you add 3×4” downspouts to 5” gutters, it will look very odd. Since work must be done to add your additional, larger downspout, now would be the best time to switch out to 6” gutters, as well.

Do downspouts come in different sizes?

Gutter downspout sizes are 3 to 6 inches. The larger a gutter downspout, the more water it can drain away quickly. However, if a gutter downspout is too large, it can look unattractive. Most downspouts are rectangular, but they can also be round or square.

What is the most common gutter size?

5 inches

The standard size for residential gutters is 5 inches, but homeowners can choose 6-inch gutters instead. While traditional 5-inch gutters are a common choice among homeowners, 6-inch gutters can hold significantly more water.

Do I have 4 or 5 inch gutters?

The optimal size of the gutter you need will depend on the amount of water the gutter needs to handle. The bigger the square footage of the roof, the more water goes into the gutter. For example, if your roof’s plane is 600-800 square feet, you should be fine with having 5-inch gutters.

Do you need gutter guards with 6 inch gutters?

SIX-INCH GUTTER WILL LET THE LEAVES AND OTHER DEBRIS WASH RIGHT DOWN THE DOWNSPOUT WITH NO NEED FOR COVERS. A LARGER GUTTER ACTUALLY WILL HOLD MORE DEBRIS THAN A STANDARD FIVE-INCH GUTTER AND IS NOT SELF-CLEANING. FOR THOSE TORRENTIAL DOWNPOURS 6-K STYLE GUTTER CAN HANDLE A LARGER VOLUME OF WATER THAN 5-K STYLE GUTTER.

Do larger gutters clog less?

Less Clogging, Better Protection



Larger rain gutters have a larger capacity to handle the rainwater and leaf debris that flow through it. This means less risk of clogging and better protection against water damage, especially when those heavy storms hit.

Are bigger downspouts better?

Reduces Water Damage



This is simply because bigger gutters along with its downspouts can carry almost double the amount of water. Plus, they have more capacity for debris. This leads to better protection from water damage without mentioning that your gutters won’t clog so easily, reducing maintenance efforts.

How do I increase my downspout size?

Now take a pair of tin snips and cut to those marks. The wide mouth fits on both 2 by 3 inch downspouts. And 3 by 4 inch downspouts.

How long can a gutter run be with one downspout?

gutter capacity and length. To limit the effects of thermal expansion in gutters 50 ft(15.3 m) is a practical maximum length of gutter to be served by a downspout.

What is downspout code?

Allow 1 square inch of downspout cross-section for every 100 square feet of roof area. Place downspouts at least 20 feet apart but no more than 50 feet apart.

How far should downspouts extend from house?

As mentioned above, the water should be diverted at least 4 to 6 feet away from the house. If a home has basement walls, it should be at least 6 feet away. The furthest away from the foundation the better. Putting gravel or rocks at the end of the downspout to avoid erosion is a great idea.