Today, A popular construction material these days are floor I-beams, sometimes called “Engineered Floor Joists.” They are convenient and easy to use. But there are strict guidelines for notching or cutting holes in engineered floor joists. A hole bored in a sawn lumber joist cannot be within 2″ of any edge or any other notch or hole. And the hole can only be a maximum of 1/3 the depth of the member.
