We are installing a Bathroom in an existing bedroom on the first floor of a 3 bed victorian terrace.
We've heard building control have regulations regarding the double joisting or sistering of joists to spread the load when a bath is full of water.
What are the regulations? Is it as simple as double joisting?
What is double joisting? Is it as simple as bolting a new joist to an existing joist? In this scenario the original joist is still taking the full load on each end that is supported by the brick wall.
Or must the new joists be supported by the brick wall (or hung) in their own right?