Once you ve located the first one the others are.
Floor joist orientation.
But larger is not always better when builders are constructing a home or adding a room addition.
Notching wood and boring rules engineered i beam rules.
The op wants to know how a beam of rectangular cross section handles that stress as a function of orientation.
The roof is modern or unique such as a single sloped roof flat roof or a unique overhang.
You can drill 1 1 2 in.
You can never ever ever notch or bore through the top or bottom flange or chord.
It is most common for them to run across the short dimension a room but this.
Ceiling joists are usually installed either 16 or 24 inches on center which means roughly 16 or 24 inches apart.
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.
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.
How to find a ceiling joist.
There are often visual clues.
Endgroup carl witthoft jan 29 16 at 13 36 begingroup carlwitthoft.
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.
Holes anywhere in the web.