Stud wall without Head Plate

BarraOG

I'm renovating a bathroom. I have replaced the floor with 18mm ply with lots of noggins and screws and it is now really solid. I now need to address the walls. For starters, I need to build a stud wall where the sink will stand and which will create the corner for the raised shower (800mm x 800mm). I have positioned noggins into which the Sole plate can be screwed - in addition to the joists. Can I bolt the studs onto the rafters rather than having a head plate? Or perhaps screw the studs to the rafters using coach screws. The ceiling is slopped where the wall will meet it, which means I would need to cut along the length of the plate to create a vertical edge. I don't have any electrical saw that would do this and not sure if it's worth buying one. That's why I'm wondering if it's just as good to bolt to the rafters instead. I will be tilling this wall. The piece of skirting in the picture is where the wall will sit. The second picture shows the rafters.

Im also thinking of using 90 degree brackets to connect the studs to the sole plate. These have a hole through which a bolt can be fed. I used these too under the floor where noggins met the joist under the wall in the first picture.

There was a door in the room before which I removed and insulated behind using metac a few years ago. The room had a mad layout previously. I will put a storage room behind the new wall.

Fan will need to be moved since it will be above the shower otherwise.

rob316

Id just run the the top plate to the where it meets the joist, put a bit of scrap wood between the sloping part and screw it in. Its a small partition it doesn't need to be bolted to the joists.

BarraOG

https://www.boards.ie/discussion/comment/121808693#Comment_121808693

Thanks for your advice Rob!

standardg60

Or just cut the top of the studs to the same angle as the head plate.