October 13, 20251 yr Hi, Just about to start adding a stud wall in my bedroom to create an ensuite. The floor is 18mm T&G floorboards which are in an okay condition (albeit 75 years old!). I'm going to change the floorboards in the ensuite to 18mm Marine ply as I need to rip it up for plumbing works anyhow. For the stud wall I'm adding, would you fix the sole plate directly onto the floorboards or would you remove the floorboards and fit the sole plate to the floor joists? I'm doing a 2 sided, L shape stud so one of the sides will be running parallel to the floor joists so will need to add some noggins on the floor joists to be able to fix it. Thank you.
October 13, 20251 yr Author Thank you, would you put in noggins in the floor joists and screw into them? Annoyingly the sole plate is only about 50mm away from the parallel joist!
October 13, 20251 yr Can you just add timber to the side of the existing joist with some timber screws to make it wider? Hopefully a chippy will comment more usefully.
October 13, 20251 yr Personally, i cant see that a stud wall running either across joists, or alongside inbetween joists is going to add much load, unless it is also going to be holding up the roof. Put a few noggins in the parallel section, but where it is running across joists, i wouldn't bother.
October 13, 20251 yr 6 hours ago, Jord said: Thank you, would you put in noggins in the floor joists and screw into them? Annoyingly the sole plate is only about 50mm away from the parallel joist! Add another joist, sistered to that one, using a slightly smaller profile (height) timber. Then screw into that.
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