Want this question answered?
No,if the joist is merely butted.The joists must sit on a bearer type of situation or have joist-hanger connectors.
A joist note on a first floor plan would refer to the Joist below that floor, a joist note on the third floor plan woud be for that floor.
There are different sizes when framing lumber. The most common size of framing lumber is 2 by 4.
2X8 set 16 inch on center.
The factors that are involved are the span you are covering, the type of roof and the pitch of it. How you are bracing the rafters. Wider the span, wider the joist. 2x6 is usually enough for most house construction.
Not knowing if the joist are in need of repair from rot (deterioration) or broken/damaged then replace ment of joist may be necessary. First get a replacement joist of the same or better species and treatment content and dimensions as the existing joist. Then cut the joist to the same length. You may have to cut a small angle on the bottom end of the joist to aid in working it over and between the girts and decking boards. Work the joist within a few inches of the joist to be replaced. Use a short 4x4 to drive the joist or a wood block to strike with a hammer. Take a couple of scrap 2x's and temporarily fasten to the girts and new joist to prevent movement. Then you may try a couple methods to remove the old joist. If the decking is fastened with screws then simply backout the screws. If it is nailed, then a 10 lbs. hammer can often remove most anything you need and is a great stress reliever but I recomend you use a reciprocating saw to cut the fasteners between the joist and decking. Usually the vibration of the saw and nails being cut will loosen the deck side of the fasteners and allow you to go top side and pull the old nail halves out. Once the old joist and fasteners are out you can carefully work the new joist in place. I recommend fastening the old decking to the new joist with properly coated screws or a hotdipped galvanized rink shank nail. Repeat joist replacement as necessary on other joist.
I would use joist hangers (see Simpson Strongtie website).
In framing and building frames a 1/32 of an inch is well with in tolerance. Possibly you have not defined your problem.
The safe answer is, "you don't" however if you must, you should seek guidance from a structural engineer with a residential construction background.
Floor joist or ceiling joist? Floor joist have a board on the end all the way along the side of the building called a rim joist. Like the cross bar on the top of a T. Ceiling joist are nailed down into the top plate of the wall and to the rafters where possible.
A joist is a beam, a supporting structure in a building. The roof joist was riddled with dry rot and had to be replaced.
Headers over doors and windows, stairs, floor joist depending on the style and size of the house.