How to Install Seamless Gutters Safely

Measure the length of your house where you intend to install your gutter and add 1/4 inch to the measurement to get the length you’ll need. You’ll likely need to use a ladder to get the correct measurements, and finding someone to help will speed up the process. As always, keep ladder safety tips in mind before you begin working off the ground.

While you’re measuring the house, make a mark every 10 feet. These marks will help you when installing the gutter, as it needs a 1/2-inch slope every 10 feet.

Next, figure out where you’d like to install your downspouts. Although the gutter is the star of the show, don’t overlook the importance of properly installed downspouts. The water from the gutters needs to flow properly to a drainage system, and you need enough downspouts to get the job done. For any gutters that are 20 feet or longer, install two downspouts.

Mark where you plan to install your downspouts (about every 30 feet) and take measurements. You’ll need them for the third step.

Even though you can DIY most of this project, you still need a pro to craft the gutters to your home’s specifications. Research who does gutter work in your area and hire to create your seamless gutters to make an installation like this possible. Local gutter pros will use a special machine inside their vans to manufacture pieces that are longer than the standard 10-foot gutters you can buy at the store. Some companies do not offer a DIY option and instead require you to use their installation services, so you might have to do some digging.

You can choose from different gutter profiles, although the most common ones are the half-round and K-style. The half-round gutters are easier to clean, while the K-style—although costlier—catch more water. Like when choosing seamless vs. seamed gutters, you should consider your needs when choosing the right type of gutter profile for your home.

Another perk of having gutters made on-site is that you can choose the color of the gutter you want. Many people opt for gutters that are the same color as the house so they blend in.

Before starting the installation, drill holes for the downspout and install the hangers on the ground. Use the measurements you got in the first step to determine where the downspout will be on the gutter. Place a downspout adapter on the right spot, trace it onto the gutter, and saw a hole for it with a miter saw. Screw the adapter into place and waterproof it with sealant.

Attach end caps to your gutter and waterproof them with sealant. Next, install hidden hangers onto your seamless gutter. These fit under the lip on the gutter and are typically placed every 16 to 20 inches on center, and you should also have one hanger at least 6 inches from each end cap.

Finally, if installing your seamless gutter on an angled fascia, use a T-wedge for every third hanger.

Hold your seamless gutter at the center, and climb the ladder. Place the gutter under the drip edge to ensure water doesn’t flow behind the gutter, and then secure it in the middle by screwing in the hanger screw.

Then, head to the highest slope of the gutter and start screwing the gutter into place. As you work down the slope, place a level inside the gutter to check that it’s sloped at the right angle.

After you complete the gutter installation, it’s time to work on the downspouts. Start by installing the first elbow onto the downspout adapter. Before screwing it into place, ensure you have the crimped side closer to the ground.

Take the second elbow and hold it up to the house. Use a tape measure, determine the distance between the two elbows, and add 3 inches. Cut a downspout to that size and use a gutter crimper to make crimp marks. This practice helps the downspout attach snugly to the elbows. 

Attach the piece to the two elbows.

Then, measure the length between the bottom of the downspout on the house to the ground and subtract 3 inches. Cut a downspout to that size, and make crimp marks for the lower end of the pipe. Install the downspout onto the elbow.

Once that step is done, secure the downspout to the house with one band on the top and one on the bottom.

Leafy trees are great because they give you much-needed shade in the summer, but they can also mean tons of gutter clogs in the fall and early winter. You could benefit from installing a gutter guard or a leaf guard if you have multiple trees.

To install the gutter guard, place it on top of the gutters and screw it into place. Note that the guard isn’t maintenance-free, and you’ll still need to hire a pro who cleans gutters a couple of times a year.