Hi
Our structural engineer has specified double 50 x 175mm joists at 400cc for our span of 4.5m for a small portion of the floor where the floor is unsupported from below.
The problem is that the width between the remaining single joists which either span over a block wall or are short enough in length, is 1100mm. So centres would be 370mm.
This seems really overkill, even though it probably meets building regs.
I'm trying to find some tables for double joists, or a large 100 x 175mm joist, spans and centres.
2 * double joists instead of 3 looks adequate, but obviously gives us 550mm centres.
Perhaps some tables will reveal otherwise.
Thanks
Our structural engineer has specified double 50 x 175mm joists at 400cc for our span of 4.5m for a small portion of the floor where the floor is unsupported from below.
The problem is that the width between the remaining single joists which either span over a block wall or are short enough in length, is 1100mm. So centres would be 370mm.
This seems really overkill, even though it probably meets building regs.
I'm trying to find some tables for double joists, or a large 100 x 175mm joist, spans and centres.
2 * double joists instead of 3 looks adequate, but obviously gives us 550mm centres.
Perhaps some tables will reveal otherwise.
Thanks