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I want to build an ensuite and want to build the walls from block not stud. Is there any special consideration needed when building block on to upstairs floorboards apart from making sure all the boards are still removable.

gw1606,
If your wall will be along the joists you must build on top of a joist preferably one which has an additional joist next to it.
If your wall is at right angles to the floor joists fix a wall plate of suitable size and build on this.
end

Dude! You shouldn't build block walls off an upstairs timber floor!

Even lightweight 'celcon' type blocks will crack up because of the flex in an ordinary floor.

Stand in the middle of your bedroom floor and jump up and down once......ornaments stopped rattling yet?

Stud walls dont have to be cr*p. If you want something that is solid, consider double plasterboarding and sound insulation quilt. You can even get a 'blue' sound insulating plasterboard.

Stud walls also allow fitting pipework much easier.

If you really must have block walls you will need a steel beam in between the joists and build off that. Or if it is at 90 degrees the steel could be just above the floor, built into the walls.

Either way, this kind of work is straying into building regs and possibly PP.

Hope that helps

Ian

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