However, this is not enough. To protect your foundation, the downspouts should extend at least 4 to 6 feet from the house, but 10 feet is preferable. Find out why this is important and how to extend your downspouts if necessary.
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.
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.
Gutter downspouts should extend a minimum of four feet away from the house; however, they may need to extend much further depending on your soil, the slope of your house and local buildings codes.
On sloped land with clay-rich soil, downspouts should extend at least three feet out from the foundation. On flat land, the Association recommends 10 feet, unless the soil is very sandy, in which case the extender may need to be much longer.
As Baenziger mentions, “This may need to be adjusted based on the slope of the exterior grade. The ground around the home should slope away from the home a minimum of 6 inches for the first 10 feet to prevent water from draining back toward the foundation.”
The Basics of Downspout Location
The cardinal rules for downspout placement suggest that they should be located at every corner of the house and approximately every 20 to 30 feet along the gutter line.
Install downspouts every 20 to 50 feet along the gutter. The more closely downspouts are spaced along the gutter, the more water can be conducted away during peak rainstorms.
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.
Calculating Downspouts Based on Gutter Length
The general rule of thumb is one downspout for every 20-30 feet of gutter. This may vary depending on several factors such as the pitch of your roof, the volume of rainfall in your area, and the capacity of your gutters.
A Elbows guide the water flow in a slight turn, typically used at the top and bottom of downspouts for sidewards redirection. On the other hand, B Elbows offer a sharp, right-angle turn, most commonly used at the downspout base to steer water away from the 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.
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.
The ideal distance for a French drain from the house ranges from 5 to 10 feet. This distance provides an adequate buffer to keep water from seeping into and around the foundation, which can be a common cause of damage.
As a general rule, contractors recommend having a downspout per every 20 feet of gutter, but depending on the gutter's capacity, it's not rare to see that distance go as far as 30-50 feet. Large gutters will offer a wider structure to channel more water at a time.
If at all possible, the downspout should end in an elbow and extension that directs the water 5 to 6 feet away from your foundation. However, make sure that it does not extend onto your neighbor's property. The extension should be at a 30 degree or more angle in relation to the ground.
Typically, residential downspouts come in two sizes: 2x3 inches and 3x4 inches. The former is often used for smaller roofs, while the latter is preferred for larger homes. A 2x3 inch downspout can handle roughly 600 square feet of roof area for every inch of rainfall within an hour.
In general, it is recommended that the maximum length of a gutter with a single downspout should not exceed 30 to 40 feet (9 to 12 meters) to ensure proper water drainage. However, this is a general guideline, and it's always best to consult with a professional gutter installer or engineer for your specific situation.
Rather than remove downspouts in winter, plumbing experts prefer to disconnect downspout extensions installed at ground level. You can also avoid detaching your downspouts if you lay deicing cables in gutters and downpipes.
While homeowners may believe that gutters must abut the roofline, this assumption is incorrect. Ideally, gutters should be placed a few inches below the roofline. They need to extend beyond the roof shingles, not align with them.
While choosing gutter colours is pretty straight forward, downpipes are a whole other ball game. There are so many variables that most homeowners don't know what to do. The rule is generally when you are replacing downpipes or repainting them if the downpipes are placed along the trim, match the colour to trim.
Buried downspouts should run at least 20 feet away from the house so the water does not discharge anywhere close to the foundation. Here's an example of what happens when you don't discharge your gutters far enough away.
Generally speaking, the main pipeline from the street to your home is either ¾ or 1 inch in diameter. Supply pipes are ¾ inch in diameter and individual components are ½ inch in diameter.
French Drains
These are typically perforated pipes that channel water in a specific direction. These pipes are usually covered with rocks and gravel to help with filtration, water flow and ensure that the pipes stay in place. French drains are the go-to choice for preventing flooded basements.