Alexei Volkov
Drain tiles, also known as French drains, are an essential drainage system for homes built on soil with poor drainage. Drain tiles are not actually tiles but perforated pipes that are buried in the ground around the perimeter of a house to protect the foundation from surface runoff. This paragraph will discuss how to install black plastic drainage tiles.
Characteristics and Values Table for Installing Black Plastic Drainage Tile
| Characteristics | Values |
|---|---|
| Installation | Mark the path for the drainage pipe with spray paint. Follow any downward slope or orient the pipe away from structures. |
| Trench Dimensions | Approximately 12" wide and 8-24" deep, sloping at a rate of ¼ per foot. |
| Trench Preparation | Pound the dirt at the trench bottom with a 4-by-4 post to stabilize the soil and prevent fouling. |
| Gravel Layer | Add a 2" layer of 1" diameter washed gravel along the trench length. |
| Pipe Placement | Cut the drainpipe to trench length, ensuring holes face downward. Place on the gravel layer. |
| Pipe Coverage | Bury the pipe with more 1" gravel until the trench is filled to within 1" of the ground surface. |
| Pipe Material | Corrugated plastic pipes are flexible and perforated, but may clog over time. Solid PVC pipes with holes are easier to clean. |
| Pipe Diameter | Typically 4", but can range from 4-12" depending on the specific application. |
| Pipe Length | Available in 10-foot rigid PVC pipes or flexible corrugated pipes that can be cut to length. |
| Weed Prevention | Use landscape fabric or filter cloth over the gravel to prevent weed growth. |
| Debris Blockage | Insert a garden hose through the cleanout port to flush the system or use an auger for harder blockages. |
| Water Direction | Pipes should be oriented away from structures, with the runoff point deeper than the drainage point. |
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What You'll Learn
Planning the drainage system
Firstly, understand the purpose and functionality of drainage tiles. Drainage tiles, also known as "French drains" or "weeping tiles", are not actually tiles but perforated pipes that are buried in the ground. These pipes collect and redirect water, preventing flooding and protecting the foundation of your house from water damage.
Next, identify the area that requires drainage. Mark out the path for your drainage pipe using spray paint. If there is a natural downward slope in the area, follow it. Otherwise, orient the pipe away from any nearby structures. You can add a slope when digging the trench for the pipe. If you need to drain a large area, you can mark off multiple trenches; they don't need to connect.
When planning the trench, consider its dimensions and slope. The trench should typically be around 12 inches wide and 8 to 24 inches deep. It should slope at a rate of ¼ inch per foot, meaning it will be deeper at the runoff point than at the drainage point. You can dig the trench by hand with a shovel or use a trencher for easier and faster digging.
Choose the right type of pipe for your system. Corrugated flexible plastic drain pipes are commonly used and have a diameter ranging from 4 to 12 inches. You can also find rigid PVC pipes with holes on one side, usually available in 10-foot lengths. Consider the advantages and disadvantages of each type of pipe. For example, corrugated pipes are cheaper and easier to install, but they may be more prone to clogging and can catch leaves and sticks in their corrugations.
Finally, think about the surrounding materials and maintenance of the system. Drainage tiles are typically surrounded by gravel to facilitate water flow. Landscape fabric, filter cloth, or sand can also be used to prevent weeds and keep debris out of the pipes. Additionally, consider how you will address any blockages that may occur over time. You can use a garden hose inserted through a cleanout port to flush the system or an auger for more stubborn clogs.
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Preparing the trench
First, determine the path for your drainage pipe. Use a can of spray paint to mark out the desired path. If the area has a downward slope, follow it. Otherwise, orient the pipe away from any nearby structures. You can add a slope when digging out the trench. If you plan to drain a large area, you can mark off multiple trenches; they don't need to connect.
The trench should be around 12 inches wide and 8 to 24 inches deep. The depth will depend on the slope you need to create. An easy way to dig the trench is by using a trencher, but if the land is soft and muddy, you may need to dig it by hand with a shovel. Even if you use a trencher, you might still need to shovel out some dirt to level the trench.
Once the trench is dug, it's important to compact the soil at the bottom. This can be done by taking a 4-by-4 post, turning it on its end, and driving it downward with force. This step helps prevent the soil from fouling the drainage pipe and provides a stable base.
The next step is to fill the trench with gravel. Add enough 1-inch diameter washed gravel to create a 2-inch thick layer along the entire length of the trench. This gravel layer will provide a stable base for your drainage pipe.
Now your trench is almost ready for the pipe installation. Just ensure that you've marked the correct path and considered the slope to facilitate proper water drainage.
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Laying the pipe
Corrugated plastic drainage pipes, also known as French drains or weeping tiles, are flexible pipes perforated with small holes on one side. These pipes can be installed underneath a lawn to provide an easy way for water to escape during and after rainfall. If your lawn does not have enough slope to drain naturally or is made of relatively impermeable soil, installing a corrugated pipe will prevent it from flooding. When marking out the path for your drainage pipe, use a can of spray paint to indicate its trajectory. If the area has a downward slope, follow it, otherwise, orient the pipe away from any nearby structures. You can add a slope when digging out the trench if necessary. If you are draining a large area, you can mark off several trenches; they do not need to connect.
It is important to ensure that the holes in the pipe are facing downwards. If you turn the holes upward, they can easily get clogged and will not start absorbing water until the water table rises above the pipe. To prevent blockages, you can install a cleanout port to flush the system with a garden hose. For more stubborn blockages, an auger can be used, although this may damage the soft plastic drain tile.
To summarise, the key steps to laying the pipe are as follows: dig a trench, pound the dirt at the bottom, fill with gravel, cut the pipe to size, lay the pipe with holes facing downwards, and backfill the trench with gravel. By following these steps, you can effectively install a black plastic drainage tile to manage water runoff and protect your property from water damage.
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Dealing with blockages
A blocked drainage tile can cause water damage to your home and property and lead to the growth of harmful mould and mildew. Drain tiles can become clogged with debris, mud, soil, silt, and yard waste. Tree roots can also cause blockages. If you notice any damage to your drain tile system, it is important to contact a professional plumber right away. They will be able to assess the damage and make the necessary repairs.
If you are able to locate the end of the drain tile, you can have it pressure washed, just like a sewer line. You can also have professionals run a camera into the drain tile pipe to see the interior condition. This is the same method used in medical procedures for checking arteries for blockages.
To prevent your drain tile from clogging with mud, it is important to clean your drain tile system regularly. There are several methods to clean a clogged drain tile:
- Hydro jetting services use high-pressure water to break up debris and clear the drain.
- A sewer jetter can be used to clean and remove dirt, sand, and yard debris.
- A cable machine can be used to clear the blockage.
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Sealing the downspout
First, assess the existing condition of the downspout and the pipe it is connected to. If there is any damage, such as cracks or perforations, these need to be addressed before creating a seal. Clean and dry the area to ensure that any products used to create the seal will adhere effectively.
Next, choose an appropriate sealant for the job. A combination of silicone sealant (SS) and concrete has been used successfully by some, but an alternative suggestion is to use an epoxy that bonds both soft and hard plastic. This can be especially useful if you are joining different types of materials, such as PVC and corrugated pipe. It is important to follow the manufacturer's instructions for application and safety when using these products.
If using silicone sealant, it is recommended to create a plug around the downspout to hold the sealant in place while it dries. This will ensure that the joint is properly sealed and that the downspout and pipe are securely connected.
Once the sealant has been applied, it is important to allow it to cure fully before exposing it to water flow. Check the manufacturer's instructions for the recommended curing time.
Finally, test the seal by running water through the downspout and observing the joint for any signs of leakage. If the seal is intact and there are no leaks, then your downspout is successfully sealed to the black plastic drainage tile.
Remember, it is important to address any potential issues with the slope of the pipe to ensure proper water flow away from the house. This may involve adjusting the slope or replacing the corrugated pipe with solid pipe to ensure effective drainage.
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Frequently asked questions
Also known as a French drain, a black plastic drainage tile is a perforated pipe that is buried in the ground around the perimeter of a house to protect the foundation from surface runoff.
First, mark the path for your drainage pipe using spray paint. Then, dig a trench that is around 12” wide and 8-24” deep, ensuring that it slopes at a rate of ¼ per foot. Pound the dirt at the bottom of the trench and add a 2-inch layer of gravel. Cut your drainpipe to the length of the trench and lay it on top of the gravel, ensuring the holes are facing downwards. Bury the pipe in more gravel until the trench is filled to within 1 inch of the ground surface.
If your black plastic drainage tile becomes blocked with debris, you can insert a garden hose through the cleanout port to flush the system. For tougher blockages, an auger can be used.
Gravel is used in black plastic drainage tile systems to surround the perforated pipes and prevent weeds and debris from entering the pipes.
Sealing a downspout to a black plastic drainage tile can cause water to sit in the pipe, potentially leading to leaks or freezing in cold weather.
