I`m going to build a suspended floor in a small downstairs bathroom so that
all the drainage & pipes can go underneath.
The room is approx 1.89m by 2.46m and I plan to batten out the wall and then
hang joists inbetween using joist hangers at 400mm intervals using the
shortest span (1.89m).
What size joist should I go for?, one book I read says I can use 100x50mm
(4x2) but I`m not sure. On top of this will be plywood screwed down and then
tiles. There will be no bath in the room, just a bog, shower and basin.
If necessary I can supplement the span with a sleeper wall (I think they
call it) to provide rigidity to the floor (don`t want it flexing with tiles
on top!).

John