If you need to go further in, drill slowly in until you feel like the drill has gone through the back of the board. Amazon sells cheap USB powered camera endoscope. The hole will be straight and there will be 1/8" clearance for the pipe. Fully slotted polyethylene drainage pipe is installed and covered with gravel. of soil and attempts should be made to have ample slope to drain the pipe. A trench is excavated and pitched. This is commonly available at all building supply stores. This allows the water to leech into the soil over a given distance, rather than pooling where you don't want it. While hanging a shelf, I recently mistakenly drilled two holes in a PVC drain pipe that was tight against the sheetrock. In many cases, inadequate slope to drain the area is the original problem that usage of a french drain aims to solve. Instead use 4" rigid PVC drainage pipe that has holes along the bottom edge. Counterintuitive though it may be, French drains work by allowing water to flow into them from below. 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). I used one recently and avoided drilling through a main sewage branch pipe. If you choose this approach instead of manually building a French drain, skip the filter fabric and crushed stones steps listed above. The gravel is the workhorse here I believe. I used PVC for this project. Most french drains use holed corrugated piping or holed PVC. The finished wall is papered and it would be a mess to cut out the sheetrock to plug the 1/4″ holes. Use a tape on a drill and only drill up to half an inch. Then use the 2 1/2" hole saw centered with the pilot hole from both sides. Re: What size hole to cut to fit a 2" PVC line through? A traditional french drain is a drain that directs water away from an area via a trench filled with gravel. Author: hj (AZ) First drill a 1/4" hole all the way through the plate as a pilot hole. This system uses a corrugated pipe surrounded by polystyrene aggregate that is then wrapped in filter fabric.. To install a French drain: The inside perimeter of the floor is cut approximately one foot from the wall. Where possible, the lowest course of block is tapped and bled (weep holes) in order to drain the walls. Sediment will eventually start to fill the French drain over time. Rigid PVC drainage pipe can be easily cut with a handsaw. You could drill more holes if you like, but the holes that are in the pipe will work just as it is supposed to, to insure the drain stays open. 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