This allows the water to leech into the soil over a given distance, rather than pooling where you don't want it. Another important thing to remember in PVC installations: Orient the pipe holes downward. The 4 inch rigid PVC drain pipe can be cleaned out with a Roto-Rooter machine - as long as you install a cleanout access point and use the proper fittings. The 3 hole pipe allows water to enter the pipe from the sides and be carried away, (french drain), while the 2 hole pipe is designed to leach water from inside the pipe away from the line, (draining the bath tub or flushing). Rigid PVC drainage pipe can be easily cut with a handsaw. of soil and attempts should be made to have ample slope to drain the pipe. DRILLING PVC. Once a 4-in. In many cases, inadequate slope to drain the area is the original problem that usage of a french drain aims to solve. Fully slotted polyethylene drainage pipe is installed and covered with gravel. If you choose this approach instead of manually building a French drain, skip the filter fabric and crushed stones steps listed above. Amazon sells cheap USB powered camera endoscope. To keep the drill bit from slipping, make a small divot in the pipe using a hammer and nail or center punch. To install a French drain: The inside perimeter of the floor is cut approximately one foot from the wall. Author: hj (AZ) First drill a 1/4" hole all the way through the plate as a pilot hole. Instead use 4" rigid PVC drainage pipe that has holes along the bottom edge. Most french drains use holed corrugated piping or holed PVC. To save some steps in the process of French drain installation, consider purchasing an alternative gravel-free drainage pipe system. I used one recently and avoided drilling through a main sewage branch pipe. Counterintuitive though it may be, French drains work by allowing water to flow into them from below. The hole will be straight and there will be 1/8" clearance for the pipe. This system uses a corrugated pipe surrounded by polystyrene aggregate that is then wrapped in filter fabric.. This is commonly available at all building supply stores. Use a tape on a drill and only drill up to half an inch. Re: What size hole to cut to fit a 2" PVC line through? Like another user said. If you need to go further in, drill slowly in until you feel like the drill has gone through the back of the board. While hanging a shelf, I recently mistakenly drilled two holes in a PVC drain pipe that was tight against the sheetrock. I used PVC for this project. A traditional french drain is a drain that directs water away from an area via a trench filled with gravel. drain pipe is placed underground, it should be covered with 2 in. The gravel is the workhorse here I believe. 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