cantilevered walkway

[TriptychScenic]

hi there,

i need to design a cantilevered walkway. its got to be about 3m long and 1m wide. the 3m side is against a wall so the overhang is only 1m. the wall is a standard stud partition wall like you would find in most houses but i cant use it to support any weight. i can however have a structure behind the wall that can be bolted to the floor. can anyone advise me as to how deep that structure should be?

i have attached a basic side elevation.

thanks for your help.

[TriptychScenic]

oops

[J Lucas]

There are very limited prescriptive requirements for cantilevered floors and decks in the IBC. If you don't have this reference, most public libraries do.