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