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If you are going to do drainage plumbing, you will need to know how to drill holes. But you can't just drill through anything or anywhere. The wood structure is holding up the building, so you'd better know where you can drill.
When drilling solid wood joists, you are not allowed to drill in the top two inches or the bottom two inches, and the hole cannot be any larger than 1/3 height of the joist.
When drilling I-joists or TJIs you are not allowed to cut, notch or drill the top or bottom structure of the joist. You can drill through the OSB webbing of the joist, but you must keep a distance from the bearing ends of the joists. In general, for every 1inch of hole you are drilling you must stay away from the bearing point 1 foot.
Glue laminated beams or glue-lams are designed to hold more weight than a TJI, so in general they should not be cut, notched or drilled. However, with permission from a structural engineer, you can drill in the very center of the beam, but the size will be limited.
Floor trusses have a lot of open space for running pipes through. They are not to be cut, notched or drilled at all.
These are just general rules. for specifics, you should look up the specifications from the manufacturer.
When it is time to drill holes, you will need to mark them out first. Calculating the slope of a pipe, and making adjustments to the center of the hole from one joist to the next will allow you to run a pipe through joists with slope. Also, to create a straight series of holes for the pipe to run through, you will need to measure from something that runs parallel, like a wall and mark each joist.
There are a variety of hole saws that can be used for drilling holes. Some of these options are demonstrated in this video.
In the end you must understand that drilling holes is hard physical work. But working hard is good for the body, mind and soul! So enjoy your time s you work out drilling holes for plumbing!