Learn how to maintain floor strength when you have to cut or drill joists for ducts, pipes, cables or other modifications. Following the rules will keep your floors flat, strong and safe. By the DIY experts of The Family Handyman Magazine. Why drilling and notching rules matter.
https://www.familyhandyman.com/floor/how-joists-work/view-all/
Definitions (2) 1. A piece of lumber two or four inches thick and six or more inches wide, used horizontally as a support for a ceiling or floor. Also, such a support made from steel, aluminum, or other material. See also random lengths. 2. Parallel beams of lumber, concrete, or steel used to support floor and ceiling systems. Picture of joist.
http://www.dictionaryofconstruction.com/definition/joist.html
If your home is more than 20 years old, your floor joists are most likely solid wood 2x8s, 2x10s or 2x12s. The notching and boring rules of thumb for solid lumber are shown in Fig. B. Codes don’t directly address how many holes and notches you can cut in a joist.
https://www.familyhandyman.com/floor/how-joists-work/view-all/
Deck Joist Sizing and Spacing. Joists are the repeated structural members that are used to build a deck frame. The minimum size joist to be used in deck construction is not a stand-alone consideration, and is related to the number of footings and beams that will be installed. In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches.
http://www.decks.com/how-to/41/deck-joist-sizing-and-spacing
Diffen › Home Improvement. Joists are used in floors and as column support. The joist (also called Bandsill) supports the load which the floor is built to bear. It is like the skeleton a building. Trusses are of many types; the simplest is a planar truss which is used as a roof support system.
http://www.diffen.com/difference/Joist_vs_Truss
The ceiling beam, or ceiling joist, has two prime functions. The first is to tie the walls of a structure or a room together, effectively completing a box configuration. The second is, as the name implies, to support the ceiling of the structure, or room. Ceiling joist framing is undertaken after the walls are erected.
http://www.wisegeek.org/what-is-a-ceiling-joist.htm
In architecture and in structural engineering, a joist is one of a series of horizontal members supporting a ceiling or floor. Joists are supported by foundations, wall framing, or beams. Joists are often laid out in repetitive patterns, much like the ribs of a human body. The intent of the use of this type of framing is to span over an open space below the members.
https://en.wikipedia.org/wiki/Joist
A partially constructed floor built with I-joists. An engineered wood joist, more commonly known as an I-joist, is a product designed to eliminate problems that occur with conventional wood joists. Invented in 1969, the I-joist is an engineered wood product that has great strength in relation to its size and weight.
https://en.wikipedia.org/wiki/I-joist
Ceiling joists are a number of horizontal beams, running parallel from one wall to the opposite wall of the structure. The beams are attached to the top of the wall at what’s known as the wall plate. A ceiling joist at the top floor of a structure may also support a flat roof, as well as the ceiling.
http://www.wisegeek.org/what-is-a-ceiling-joist.htm
What is a floor joist? Floor joists are used to support a floor that spans over an open area, like over a basement, crawl space or lower floor level or between shed floor beams. It is like a mini bridge that is only supported at each end.
https://www.icreatables.com/how-to-build-shed/framing/what-are-floor-joists
what are joists?
Joists are the repeated structural members that are used to build a deck frame.