In general I agree that the 7x5 @ 30" c/c spanning 12 feet is adequate. This member will support a uniform load of approximately 190 lb/linear foot or 75 lb/ft\2 based on an allowable bending stress of 1000 psi. However, I don't know what you intend to support or what type of joints or wood species you intend to use so you should pay close attention to those details.
Originally posted by Drew:
I am an amatuer and I am designing my own timber frame to begin this spring.
My question envolves joist sizes (length vs. depth). According to my calculations a floor joist that is 7x5 and 12 feet long spaced 30 inches o.c. will work. Any feedback?
[This message has been edited by rap (edited 01-09-2001).]
