Floor Joist Orientation

Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor.

Floor joist orientation.

Endgroup carl witthoft jan 29 16 at 13 36 begingroup carlwitthoft. Once you ve located the first one the others are. You can drill 1 1 2 in. Notching wood and boring rules engineered i beam rules.

You can never ever ever notch or bore through the top or bottom flange or chord. The floor joists may run parallel to the short dimension at the floor level but at the roof level the short dimension is the opposite direction. The more material you can put away from the force the less of an impact that force has on the material is correct but the rest of it seems a bit off the. Ceiling joists can run in any direction and it is often very difficult to tell which way they are running without being able to seem them.

How to find a ceiling joist. The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example. The roof is modern or unique such as a single sloped roof flat roof or a unique overhang. Holes anywhere in the web.

In fact most have little perforated knockout holes that can be punched out with the swing of a hammer. The op wants to know how a beam of rectangular cross section handles that stress as a function of orientation. There are often visual clues.