If you want to ensure your system continually performs for decades to come then be sure to line your trench with Nonwoven geotextile drainage fabric using the " Burrito Wrap " install method. Select the correct type landscape fabric that will properly drain sub-surface water is key to installing a functional and long lasting French Drain.
The two primary types of geotextile landscape fabric used are Nonwoven Fabric , a permeable felt like material, and Woven Fabric. Both fabrics have their advantages depending on the application. For water drainage you will need a something that will let water easily pass through and also keep dirt and debris from entering in.
Namely you will need a Nonwoven Drainage Fabric. Nonwoven Drainage Fabric is designed to allow water to pass through while filtering dirt and debris from entering into your system and clogging up drain lines. This type of fabric is also sometimes called landscape drainage or filter fabric for this reason. Woven landscape fabrics typically have a greater pull strength, but in general do not provide a high flow rate, making for poor drainage.
Woven fabrics are commonly found as ground cover for weeds, and also under gravel driveway and paved road construction where strength is needed. Use 3 to 4. These are the most commonly used weighted fabrics to line a French Drain. It provides great flow through rates and is strong enough to last the life of the drain. Nonwoven drainage fabric vs. Woven Geotextile. Excavating a French Drain. Adding soil back into the trench should be avoided.
Excavating the trench and installing a drain system is normally done because because the soil didn't properly drain. Ideal drain fields are porous, allowing water to flow to its desired destination without impediment.
The pooling of water in a drain pipe can lead to some major issues and create problems for your drainage system. It's important that you take the time to ensure the pipe is at an angle that will allow the water to drain. No Slope : When the pipe is completely flat, water requires more energy to move through the drain. Zero slope systems will not allow sub-surface water to drain properly. Low Spots : Be mindful to avoid low spots or dips in your trench.
Pooling can occur, increasing the retained water within the drainage line. This kind of pooling can be extremely problematic as it attracts one of the most detrimental things to drains Tree roots naturally seek out moisture in order to promote growth and are attracted to the standing water in your drain.
Once roots enter the system they will block flow and reduce effectiveness. A properly designed French drain system does not require an outlet. The water will simply soak into the soil as it flows along the perforated pipe. In fact, a French drain doesn't require an inlet on just one end either. You can construct the drain to accept water along its length, and disperse it underground. Can you use landscape fabric for French drain? A landscaping French drain is a gravel-filled trench lined with landscape fabric to keep soil and silt out of the gravel.
While some types of these drains include a perforated drain pipe sometimes called drain tile and may be covered with grass, the traditional French drain is simpler and easier to build. What type of stone do you use for a French drain? Smaller rock with fine particles could clog the holes of the drain pipe. Pea stone works, but the smooth stones settle together and don't move as much water as coarse rock.
Is Gravel good for drainage? Gravel is an ideal drainage solution for two primary reasons — weight and an impenetrable surface. The weight and coverage area provided by the material prevents erosion, and its solid, moisture-resistant design allows water to drain faster. As such, it prevents precipitation from pooling on the surface. How do you calculate gravel for a French drain? How to Calculate Gravel for French Drains Measure the trench, in feet, noting its length, width and depth.
Calculate the sum of the width measurements and divide by the number of measurements taken to calculate the average width. Calculate the average depth using the method described in Step 2. Measure the diameter of the drainage pipe. Here are some of the most helpful resources I found when when initially doing research on the subject. A French Drain can be an extremely effective method for solving a drainage problem in your yard and maintaining the integrity of below grade concrete walls.
If you determine that a french drain is right for you, make sure to do your homework in terms of best practices for installation. Additionally, make sure to locate any utility lines or wiring that might be beneath the area that you will be digging your trench.
Hopefully you find this post useful and it can point you in the right direction in terms of addressing the drainage needs for your house. Steve is the owner and an author with TheHomeFinisher.
He has been an avid DIY'er for years. He can often be found working on his own home or his rental properties. The Home Finisher is a way for him to share some of the tips and tricks he has learned along the way.
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