Burying downspouts improves the aesthetics of your home by hiding the pipes, enhances safety by reducing tripping hazards, and provides effective drainage that prevents water from pooling around your foundation, thus reducing the risk of basement flooding and soil erosion.
Proper drainage is crucial when it comes to buried downspouts. Without it, water can accumulate and cause a variety of problems. For instance, water can seep into the foundation of your home, causing significant damage over time. This can weaken the structure of your home, and lead to costly repairs.
Burying your gutter downspouts is a fantastic way to reap their benefits while also keeping your yard looking pristine. Underground downspouts can help guide rainwater away from your home's foundation—and channel it to the thirsty areas of your lawn.
Water pooling around your downspouts, underground drains, or foundation is one of the most easily spotted signs of a clog in your underground drain. Something is preventing the water from flowing where it needs to be, forcing it to return the way it came in, leading to pooling water.
The only way to completely prevent underground drains from clogging is preventing any debris from going down there in the first place. If you have under ground drains, it is highly recommended that you have some sort of leaf protection on your gutters or strainers in your downspouts.
Materials Needed: Solid corrugated drain pipe in 3 in. or 4 in. (at least 15 ft.) Downspout Cleanout.
Size of the Gutter Drainage Area: As a rule of thumb, one downspout should be placed every 25-35 linear feet of guttering. Depending on the local climate and rainfall intensity, some homeowners may need more downspouts. Many homeowners add extra downspouts to boost the drainage capacity of their gutters.
Always vent downspouts at the house to keep buried downspouts from freezing. You can get warm water through that vent in the wintertime if you have a freeze up. Then, if you do freeze up and you have a thaw, the water will come out of these vents.
Your gutter downspouts should not touch the ground. Otherwise, the rainwater might get backed up in the gutter until it starts overflowing.
Many homeowners do not realize that their downspouts run into an underground downspout system, sometimes called a french drain. These underground downspout drains can get clogged as easily as your gutters can with leaves and debris.
The average cost to install downspouts is $30 to $75 per downspout. Total downspout replacement costs $220 to $625 for 4 to 5 downspouts. Adding new downspouts costs $2 to $4 per linear foot installed. Burying downspouts with a drainage system costs $150 to $350 each.
Downspouts need to be emptied at least 10 feet away from the house. If you can't ensure this with the downspout, it's best to either relocate it or add an extension that will lead the water away from the house's foundation.
Installing a buried downspout drainage system is a great way to manage rainwater runoff and keep it away from your foundation. By minimizing the risk of flooding and soil erosion, buried downspouts offer a reliable, low-maintenance alternative to surface-level options.
How many downspout installations should your gutters have? If we have to sum it up in a single rule, gutters need a downspout around every 30 to 40 feet. For most homes, this means installing spouts at either end of a gutter section.
Redirecting roof runoff is as simple as adding a downspout extension. These are plastic (PVC) or metal extensions that attach to the bottom of your existing downspout. The extension should carry your roof runoff at least three to five feet away from your home to prevent any water damage to your home or foundation.
To ensure proper coverage and protection, bury your downspout extension at least 12 inches deep. This depth helps protect the pipe from surface activities and ensures efficient water drainage.
In summary, underground PVC pipes are indeed likely to freeze in cold environments, especially when buried too shallowly, the soil is moist, or the outside temperature is too low.
The minimum cover required when the drainage system is in a traffic area with drainage pipe diameters from 100 mm through 1200 mm (4”-48”) must have at least 0.3 m (12”) of cover over the pipe crown, while 1500 mm (60”) pipes must have at least 0.6 m (24”) of cover.
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.
Correct Number of Downspouts for Your Gutter System
Your gutters should have a downspout around every 30 to 40 feet.
Cast Iron
Despite the heat resistance and noise-dampening properties of cast iron, it's not as suitable for underground water supply as newer materials. Cast iron is not resistant to corrosion, which can compromise the quality of the water supply and damage the integrity of the piping, leading to leaks and breaks.
Acidic soil and runoff from road salts are common problems that can shorten the life of other drainage pipes to just a few years. Corrugated plastic pipe will last for decades in the same environment.