johncol wrote:
still waiting for help on the following problem?

I have a lounge floor 16 X 12 feet wide which has 5" X 2" joists at
11" centres along the width (12 feet).I have removed a toilet and
pantry underneath, the walls of which helped to support the floor in
question.The floor is ok but a bit bouncy,since it should really have
7" joists.I intend to put a 16 foot RSJ underneath at 7 feet along the
width.Any help in calculating the size of the RSJ? How thin can get
away with,bearing in mind that anything would improve the situation?
Hope all this makes sense! Any help greatly appreciated!

Lounge, lounge. What is it? Have you bought an ex-public house? Anyway,
a little more detail on what's been removed, and the general structure,
would be helpful - photos to a website near you if poss.