Clogged Downspout : Causes and How to Unclog a Downspout

Downspout clog - causes & solutions

99% of all gutter related problems and damages are the result of a clogged downspout. The signs and symptoms of downspout clogs are easy to recognize. We’ll walk you through all the possibilities and let you know the solution.

clogged downspout


How much water do you think gets by a downspout when it is stuffed full of debris? The answer is not much if any water can get by so it overflows the gutters.

What is a Downspout?

Your gutter system consist of gutters and downspouts. The gutters are the horizontal trough that collects the water on the sides of your roofing edge. And the downspouts are the vertical pipe that carries the water from the gutter to the ground.

gutter downspout

Downspouts come in all different shapes and sizes, but they all perform the same task. Getting the water to the ground. Most homes have 2×3″ rectangle downspouts, or 3×4″ rectangle downspouts. We just call them downspouts. However some homes will have circular downspouts which are called “round downspouts“. They come in different sizes from 3″ up to 6″, with 4” being the most common. Lastly large commercial buildings will often have square shaped downspouts which are called “square downspouts”

CLICK HERE for our Gutter Terminology and Accessories Guide.

What is a Downspout Clog?

Downspouts are the only way for the water to drain through your gutter system. Meaning all the water that lands on the roof goes into the gutter which drains down and out via the downspouts. Basically it is the only road through which all water must travel to drain.

downspout clog

When debris goes into the gutters it eventually flushes through the downspouts. However once something becomes lodged inside the downspout it begins to form a blockade. Water is still able to pass but eventually more and more debris will get snagged up and a clog forms. A downspout clog is when the water no longer flows through the downspout.

Signs of Clogged Downspout 

There is one key point to remember when it comes to gutter problems. You won’t be able to know there is an issue if you do not check the gutter system during rain. Especially downspout clogs. Since the debris gets lodged inside of the downspout you are not able to see it.

1. Gutter Overflowing Near Downspout

One of the first signs people often notice that they have a downspout clog, is when the water overflows the gutter nearby. If you have water going over the gutter directly near the downspout, then you likely have a clogged downspout. The gutter could also be loose in that location, but you would see a gap behind the gutter.

downspout clog

Here is a quick little video that shows how water will look like it is dripping from the gutter. Actually what is happening is it is overflowing the gutter and flowing across the face to where it drips down. This is the result of a clogged downspout.

2. Entire Gutter Overflowing

rain gutters overflowing

Whenever you have water overflowing your entire gutter system. That is a for sure sign that you have clogged downspouts throughout your gutter system. All that water has to go somewhere, and if the drain is plugged then it will eventually overflow. If your gutters are completely filled with water like this, they are pulling themselves loose from the wall. Therefore if you see this happening you’ll want to get the gutters cleaned before expensive damages occur.

3. No Waterflow Coming Out Of The Downspout

Downspout clog - causes & solutions

All water that lands on your roof will travel through the gutter system to where it drains out of the bottoms of the downspouts. Unless you have underground drains you will be able to see all of the draining water. But what does it mean if no water is coming through the downspout? As you might have guessed it means the downspout is clogged. If there is moderate rain and little-to-no water is coming through the downspout then something is up. And that something is a clog in your downspout. Same as above, you would remedy this issue with a gutter cleaning.

4. Downspout Leaks

Water can leak from the downspouts in several locations. 

Water Leaking From Gutter and Downspout Connection Point, aka Gutter Outlet

gutter outlet


You can see the gutter outlet through the tiny gap. This downspout could be moved up a quarter inch to cover the gap if it leaks.

The place where the gutter and downspout meet is called the Gutter Outlet. Basically the gutter has a hole cut in it and an outlet is installed. Once the downspout is properly connected to the outlet with a couple screws the outlet is no longer visible.

Water leaking from the gutter outlet is very common and it mean’s only one thing. There is a gutter clog in the downspout below. Most clogs in the downspout occur in or near the elbows. The debris tends to get caught up in the twists and turns. Therefore if the outlet is leaking and it’s near an elbow, there is a clog in that elbow.

Water Leaking From Downspout Seams

Sleeve style downspout sections tend to become thinner on one end and slide into the next section. Water can leak from any of these seams. Especially if any sections were sleeved the wrong direction. When something is sleeved in the wrong direction, that means the thinner section is pointed up instead of down.

Water Leaking From Elbows

As you may have guessed water leaking from the elbows is also an indication of clogs in the downspout elbows. However sometimes the elbows weren’t pushed back together tight enough last time they were cleaned. If you can see any sort of gap or if the water is pouring through the elbows then it may be loose and need to be pushed back together or re-secured.

5. Downspout Splitting Open/Pulling Apart

Downspouts essentially are a single sheet of aluminum folder over and crimped together. The crimp seal is always installed facing the home. therefore you never see it because it’s on the back side of the gutter.

crimped downspout seam


Even downspout elbows are held together by the crimped seam.

When the downspouts become clogged and are left unchecked for a long time more and more debris stacks up in there. Overtime from more and more rain and debris everything gets compacted. The gutters will be overflowing every time it rains at this point because absolutely no water gets through.

packed downspout

Eventually if nothing is done the crimped seal of the downspout will uncrimp and the downspout will split apart. Once the crimp seam on the back side of the downspout is ripped open, the downspout is beyond repair and has to be replaced. Water is able to freely pour out of the seams.

How to Fix a Clogged Downspout

There is only on way to take care of a downspout clog, and this is to clean the downspout. The first place to start is you will have to physically take the downspout apart at the elbows. Most downspout clogs occur in the elbows of the downspouts. That is because this is a high seam area but mostly because of the twists and turns. The longer the clog was there, the more compact the debris will be inside the downspout. If there is a lot of debris you may have to remove the entire downspout from the wall to get it out of there.

Fortunately for people who do not want to deal with that there may be gutter cleaning service providers in your area. Here at My Gutter Pro gutter cleaning is our specialty. We have 1000’s of customers signed up for automatic yearly gutter cleaning services. So when it comes to gutter cleaning we know what we are talking about.

CLICK HERE to schedule a gutter cleaning service with My Gutter Pro. (MARYLAND & DC ONLY)

For more information on gutter cleaning check out some of these related articles.





Solutions For Downspouts That Frequently Clog

If you have trees very close to the home it’s likely that you have a downspout or two that become clogged all the time. There are a few solutions to help with this so you don’t need to pay for so many gutter cleaning services.

Gutter Covers

perforated gutter guard


Perforated Aluminum Gutter Cover

The best way to prevent debris from entering the gutter system is gutter covers aka gutter guards. There are many types of gutter covers available on the market at many different price points.

In our opinion gutter covers are the number one way to keep debris out of your gutters and downspouts. In fact the style that we use and recommend, perforated aluminum gutter covers, only allow smaller particles into the system. As long as everything is pitched correctly smaller particles will flush through the gutter system when it rains. And they will never become clogged because nothing big enough to clog will fit through the tiny holes.

CLICK HERE for more information on Different Styles Of Gutter Covers.

Upsizing Your Downspouts

gutter materials

The thicker the downspout the less likely something will become clogged. Therefore upsizing your downspouts to a larger size is a good way to prevent clogs. The problem with this is you can only upsize to what is compatible with your size gutter. For example let’s say you have a standard 5″ gutter with a standard 2×3″ downspout. You would be able to upgrade to a 3×4″ downspout on the 5″ gutter, but that’s as wide as you can get. You would not be able to have a 4″ round downspout installed to the 5″ gutter. With a 6″ gutter you would be able to upgrade from a 3×4″ downspout to a 4″ round downspout. Depending on how many downspouts you have and how tall your building is, it may be cheaper to just have gutter covers installed.

Downspout Drain Covers aka Downspout Strainer

downspout drain cover


Downspout Drain Covers aka Gutter Ball

There are several products on the market labeled as downspout drain covers. Basically they look like a ball of wire and they shove the pointed end into the gutter outlet so the ball is sticking up in the gutter. What this does is blocks larger debris like leave from going down the downspout. The problem with these is that the debris piles up rather quickly around them since they can’t flush down the drain. You’ll still need to have the debris removed from your gutters once water starts leaking or overflowing. Because of this we would only suggest these for one story homes that have easily accessible gutters that the homeowner is able to reach. Otherwise you’ll be spending more on gutter cleanings than you would without these.

Downspout Filter aka Downspout Trap

Last but not least we get to the downspout filter. We’ve heard a few different names for this and we’ve also seen a few different prototypes but they all provide the same function. And that is to trap the debris in the downspout so the homeowner is able to manually remove the debris themselves. This may sound like a good idea but there are a few flaws to this plan.

The main issue with these is these are located on the downspout itself. Any debris that has made it past the elbows at the tops of the downspout was likely going to wash the rest of the way out of the bottom of the downspout. Therefore there really is no reason to trap the debris once it has made it past those elbows. Another issue with these is people don’t realize how often you need to clean out this trap. If you leave the trap blocked it forms a clog rather quick.

Well there is one reason for these to be useful, and that is if you have underground drains. If your downspouts lead to underground drains then you need some type of protection from debris going underground and clogging. Gutter covers are always suggested but if you are not able to afford those then gutter drain covers or these would be recommended. The bottom line is you need some type of defense for your underground drain system.

Clogged Underground Drains

Keep in mind that if you have underground drains they can also become clogged. The signs and symptoms of clogged underground drains are exactly the same as clogged downspouts. You’ll first want to verify that your downspouts are not clogged before hiring a plumber to clear your underground drains.

underground drain clog


Puddles of water by the underground drain indicate a clog.

CLICK HERE for more information on clogged underground drains.

How Often Should I Clean My Gutters And Downspouts?

What is the optimal gutter cleaning frequency? It all depends on the tree coverage in your area and how close they are to your home. We always suggest scheduling your cleanings for the end of fall or the end of spring. Try to figure out what schedule works best for you and stick to it. That way you don’t forget before it is too late.


Problems And Damages Caused By Clogged Downspouts

If you let downspout clogs go on for long enough it will destroy your gutter system. The gutters will pull themselves loose from being too full. However if your fascia board is loose or rotting it could even pull the whole system down. Even worse if your fascia is connected to soffit. Basically the more stuff your gutters are attached to, the more stuff that will get damaged when the gutters fall down from being too heavy.

CLICK HERE for more information on Damages Caused By Downspout Clogs.


Downspout clogs are pretty easy to identify so as long as you keep an eye on your gutters every few times it rains, you’ll be able to spot problems before they get too bad.

Check out My Gutter Pro’s new official blog spot “Talking Gutters” for more professional gutter related information.

CLICK HERE to contact the experts at My Gutter Pro.


My Gutter Pro

93 Monocacy Blvd. A-6

Frederick, MD 21701

(973) 852-6987

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4 Responses

  1. I have not checked in here for a while because I thought it was getting boring, but the last few posts are good quality so I guess I will add you back to my everyday bloglist. You deserve it my friend 🙂

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