Just what is a “French Drain?” Many times people incorrectly
- A French Drain can protect your foundation!
A basic French Drain consists of a Perforated Drain Pipe in the bottom of a trench. The French Drain Trench runs through a Problem Drainage Area that needs to be drained. The French Drain Pipe is perforated (Full of Small Holes) and has Neo-Prene Soc around the pipe. This soc helps prevent debris from clogging the French Drain Pipe.
The dirt that was taken out to make the trench is hauled away. It is replaced by some type of small stone or gravel depending on what is desired or available. I prefer crushed 1 inch lime stone. It is the most economical option in my area. Pea Gravel or some other type of small stone can work just as well. The lime-stone or gravel is placed in the trench on top of the perforated Drain Pipe and filled all the way to the surface (ground level). In some cases where the French Drain needs to be deep or is being placed in sandy soil, a special trench liner must be placed in the trench before the perforated Drain Pipe or the Gravel are installed. This helps maintain the integrity of the trench over time. It also increases the cost of the French Drain and the amount of time to install it. I install a trench liner in a French Drain about 20% of the time. Most of the time a liner in not needed.
- French Drain March 2011
A French Drain is designed to handle a large volume of water and cover a large area. The Drain is anyplace the trench goes. It has many applications and can be used in many situations. It can be installed by itself or incorporated into a Drainage System with Surface Drains or Gutter Down-Spouts connected to it.
The main downfall of a French Drain is that they, for the most part aren’t very pretty. They don’t look very nice in a yard once they are completed.
Edmond Oklahoma has been the location for many French Drain Installations for CMG in the past several years. Recently we ripped out an old Surface Drain that was under a deck. The Surface Drain was too small for the job and did not Protect the Foundation from Standing Water.
The First step was to take out part of the deck along the wall. Next we took out the Surface Drain and the Three Inch Pipe which was too small. Digging a trench along the foundation came next. We had to ensure the, “Fall” to make sure the water would run from left to right.
Next a French Drain Liner needed to be installed. This was necessary to maintain the integrity of the trench and to keep the French Drain Pipe from filling up with sand and getting clogged over the next few years. CMG then installed 4 inch ADS Perf/Soc French Drain Pipe along the course of the French Drain. Next we connected the end of the French Drain Pipe to Solid 4 Inch ADS Drain pipe to continue along the trench to the Pop-Up Emitter at the Exit Point.
|Connecting a gutter to a Drainage System|
CMG installed a 4 inch French Drain in East Norman this week. The customer had water standing on the side of his house that was causing foundation damage. He contracted a Structural Engineer to come out and look at the Drainage Problem and to give him some advise.
|6 inch French Drain|
The Structural Engineer recommended a French Drain to protect and draw water away from the foundation. He said that, “he had recommended French Drain Installation to solve similar problems for home owners many times in the past. The Structural Engineer was confident that it would solve the Drainage Problem.
Next, our customer went online and found us by searching under, ” Norman Oklahoma French Drain.” He also checked us out on Angie’s List and Found that we were one of the highest ranked Drainage Contractors in the state of Oklahoma for installing French Drains.
|Drain Pipe running to Pop-Up Emitter|
The Gentleman gave us a call to set up an appointment. CMG arrived on the agreed time and provided a ( Free- No Obligation- Drainage Diagnostic and Quote) We came out and looked at his Drainage Problem and designed a Drainage System to solve his, Standing-Water Problem.” We also recommended a surface drain in a corner where water was coming off a steep part of the roof and overwhelming the gutter.
|Installing a curb outlet for a French Drain in Norman|
The customer let us know that he was ready to move forward. We scheduled the Drainage System Installation for the following week. When the scheduled day arrived, we installed the Drainage System. The Drain was made up of a 6 inch French Drain running 30 feet along the East side of the house. It curved around the corner of the house. At that point a 12 inch Surface Drain was connected to the French Drain with 4 inch pipe. The 6 inch French Drain at that point changed to 6 inch Solid Drain Pipe and continued under ground 65 feet to a pop-up emitter at the curb in the front yard near the street.
Depending on the area the French Drain is installed and the type of grass around the French Drain, will dictate whether grass grows over the lime stone. Grass can grow up and through the gravel in the French Drain over time eventually covering the gravel. This is Ok. It won’t have a measurable effect on the performance of the drain.