Repairing Guides

how to repair a french drain

by Glennie Fay Published 3 years ago Updated 2 years ago
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  1. Plan the Location. Figure out where the excess water is pooling and where you want it to go. ...
  2. Dig a Trench. Dig a trench from the place in your yard that needs drainage to your chosen outlet. ...
  3. Line the Trench with Filter Fabric. ...
  4. Pour the Gravel Bedding. ...
  5. Hook Up the Pipe Connections. ...
  6. Set the Pipe Drain in the Trench. ...
  7. Cover with Gravel and Filter Fabric. ...

More items...

Part of a video titled How To Fix a Failed French Drain - YouTube
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3:06
Down now we're covering the trench with gravel. And remember that water will come down through thatMoreDown now we're covering the trench with gravel. And remember that water will come down through that gravel to the bottom of the trench. And then flood up into the bottom of the pipe where the holes.

Full Answer

How much does it cost to repair a French drain?

Installing a French drain (which is different from a basement drain) is the fix many homeowners opt for, and French drain cost ranges from a low of $500 for minimal repairs to as much as $18,000 ...

How to unclog outside drain and French drain pipes?

Method 2 Method 2 of 3: Using Baking Soda and Vinegar

  1. Pour 1 cup (208 g) of baking soda into the drain. Remove the grate on top of your drain so the baking soda can get into your pipes.
  2. Add 1 c (240 ml) of vinegar to the drain to start a reaction. After the baking soda, put white distilled vinegar in the drain.
  3. Let the mixture sit for 30 minutes. ...
  4. Dump a pot of boiling water into the drain for 2 minutes. ...

How to find and repair broken French drain pipe?

Photo of a Buried Drain Line that Should be Abandoned

  • Clogged or broken buried downspout drain line
  • Buried downspout line (stupidly) connected to the building footing drains
  • Buried downspout line connected to drains that run through and/or under the building basement floor
  • Buried downspout line connected to local septic or sewer piping

How to install a French drain in your landscaping?

Instructions

  • Determine a Trench Location. Assess the flood-prone area (s) of your yard to determine a general location and route for your French drain.
  • Gain Approval. Confirm that your yard drainage will not adversely impact anyone else's land or any public areas, which could lead to legal problems.
  • Check the Slope. ...
  • Dig the Trench. ...
  • Line the Trench With Fabric. ...

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How do you fix a collapsed French drain?

0:272:57How To Replace Section of French Drain, Collapsed Pipe - YouTubeYouTubeStart of suggested clipEnd of suggested clipWe're going to show you how to do that real simple repair you just got to expose the collapsedMoreWe're going to show you how to do that real simple repair you just got to expose the collapsed section cut it out put a new piece of pipe in.

How do you redo a French drain?

11:5613:10Replacing French Drain - YouTubeYouTubeStart of suggested clipEnd of suggested clipThat's where you need to put a catch basin it picks up that surface water and then we ran some easyMoreThat's where you need to put a catch basin it picks up that surface water and then we ran some easy flow which is the French drain.

Do French drains need maintenance?

Fortunately, there's not much regular maintenance needed for a French drain to function. However, over time, debris and leaves can build up in the drainpipe's holes, compromising its effectiveness. To prevent this, clean out and snake the French drain once a year.

Why would a French drain fail?

Over time, a French drain may become clogged. Tiny soil and clay granules slip through the pores of the landscape fabric and gradually build up inside the pipe. Another common cause of French drain clogs is root intrusion from grass, shrubs, and trees.

How much does it cost to redo a French drain?

Pooling water could be the first sign of a problem—fixing it requires rerouting the path of the water. French drain cost runs anywhere from $500 to $18,000, with $5,000 being the national average. Modern building practices incorporate methods to direct rainwater away from a home's foundation.

How long will a French drain last?

approximately 30 to 40 yearsGenerally speaking, a French drain will last approximately 30 to 40 years. However, the above-mentioned factors may shorten its life cycle and it must then be replaced by a team of foundation experts.

How often redo French drain?

When enough sand, clay or silt gets past the fabric, the gravel spaces fill and the effectiveness of the french drain ends. This is why most experts state that a French drain is not a long-term solution to a drainage problem: You have to dig it up and reinstall it every eight to 10 years.

How do you tell if a French drain is clogged?

Allow 1–2 minutes for the water level in the trench to rise and enter the drain pipe. If water begins to flow out of the pipe end, the French drain is working. If water does not flow out of the pipe end, the French drain is clogged.

Can French drains be cleaned out?

Despite the design's best efforts, French drains get clogged by dirt, debris and silt. They do need to be cleaned out regularly – about once per year – to ensure that they continue to direct water away from the building's foundation. The best way to clean a French drain is mechanically, using an electric snake.

Should a French drain have standing water?

A French drain can work as a shield, collecting water before it reaches the patio and diverting it away. This will also eliminate the standing water that mosquitoes need to breed. Runoff from a neighboring property: Water from an uphill neighbor's property can drain towards and puddle next to a home or business.

Can a French drain cause a sinkhole?

2:243:08Biggest Mistake Made to Cause French Drain Failure - YouTubeYouTubeStart of suggested clipEnd of suggested clipNever put the dirt back in the dirt is why you're building a drainage system 99 out a hundred timesMoreNever put the dirt back in the dirt is why you're building a drainage system 99 out a hundred times to begin with because it has poor percolation. If it had good percolation.

What is the best pipe to use for a French drain?

One of the most common pipe materials used to create a French drain is plastic because of its durability. There are two frequently chosen pipe variations: corrugated and PVC. Both are lightweight, but corrugated pipe can be flexible, while PVC is stronger and more rigid.

Can you cover a French drain with dirt?

Can I cover a French drain with dirt? Because a French drain has holes throughout the pipe which allow it collect water, you should not install dirt on top of the drain pipe. Installing dirt will clog the pipe and the holes, rendering it useless.

How much does a DIY French drain cost?

French Drain CostAverage Cost of French DrainNational average cost$5,000Average range$2,800-$6,500Low-end$500High-end$18,000Feb 16, 2022

How deep should a French drain be dug?

French drain depth: About 8 inches to 2 feet deep should be sufficient for many water-diverting projects, though related systems, such as those built around foundations and sub-ground living spaces, as well as the bases of retaining walls, may be deeper.

Which is better sump pump or French drain?

Sump pumps offer a few key advantages over french drains. The biggest and most obvious advantage is the amount of water they can pump and drain. Pumps like the Zoeller M53 Mighty Mate can drain up to 43 gallons of water per hour at a 5′ head height – something that french drains can't compete with!

How to clean a French drain?

To clean your French drain, rent an electric sewer snake (or auger), a motor-powered spool of cable with a two-pronged cutter at its tip. Call two or three rental locations (e.g. hardware stores, equipment rental stores) to compare prices, which should be around $65 or more for a half day rental. Choose between a 50-foot and 100-foot model (depending on the length of your french drains), and opt for a machine with 3⁄4 inch (1.9 cm) cable.

What to do if your French drain is connected to your gutter system?

If your French drain connects to your gutter system, clean out your gutters and downspouts during your yearly inspection. Invest in a gutter screen to keep future debris out.

What to do if your drain has louvers?

If your drain has louvers, be sure to remove the cover and clean the inside of the drain and each louver slot.

Why is my French drain not blocking up?

It could be a sign that the drain wasn't installed properly. When a French drain is installed correctly with the right filter fabric and crushed stone, it should really never block up.

How much does it cost to clean a drain?

Look up several options for service (online, or in local listings) to compare prices and availability. Note that prices may vary, but standard drain cleanings generally cost upwards of $250 per visit.

How to remove a snake motor cable?

If the cable encounters a large clog that it cannot clear, remove it entirely by pulling it gently and using the reverse switch on the snake motor (if necessary). Wipe down the cable with a wet rag as it recoils to remove build up. Once the cable is out entirely, turn off the machine and remove debris (e.g. pieces of tree root, leaves) from the cutter.

How to get cable to bend?

You may need to wiggle the cable and gently move it back and forth to get it around a bend.

What is a French drain?

French drains are filled with gravel or small stones. A French drain, also called a land drain, is made up of a ditch filled with stones or gravel. The ditch directs water away from an undesirable area, such as the base of the house. These drains can be a simple and useful way to redirect water on a property, as long as they are angled ...

How does a French drain work?

Water seeping through the soil to reach a French drain often carries sediment into the drain. The water then deposits this sediment on the gravel in the drain as it flows through the ditch. Over time, this sediment build-up can slow the flow of water through the drain or block it up entirely. Once this occurs, the water no longer passes through the drain correctly, and can flood homes or other areas of the property. Repairing this problem often requires digging up the entire drain and replacing the gravel. Some French drain installations attempt to avoid this problem by using a filter at the beginning of the drain. When it clogs, only the filter must be replaced.

What causes a French drain to clog?

Water seeping through the soil to reach a French drain often carries sediment into the drain. The water then deposits this sediment on the gravel in the drain as it flows through the ditch. Muddy water flowing through the drain can also cause clogs, and roots from nearby plants can get into the drain and block it. Over time, this sediment build-up can slow the flow of water through the drain or block it up entirely.

Why does my French drain backflow?

Backflow. In areas with poorly-draining soils, draining water from a French drain into the traditional dry well may cause problems. When the soil becomes saturated , the well fills with water, sending flow back up the French drain and into the home or original problem area.

Can you tie a French drain into a downspout?

Many homeowners choose to tie their French drains into a downspout, but as the house settles over the years, this method may cease to work, causing water to flow back into the home. G.D. Palmer is a freelance writer and illustrator living in Milwaukee, Wis.

Can French drains be used to redirect water?

These drains can be a simple and useful way to redirect water on a property, as long as they are angled from high to low ground. However, French drains also have a number of disadvantages. Advertisement.

Can you dig a drain below the footer?

This digging may encounter gas and water lines, electrical wires and sewer pipes, all of which pose hazards. It's also important not to dig too deep – if the drain is dug below the level of the footer, it may undermine the foundation, causing the home to settle. Advertisement.

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