Hello,

I'm stuck...

I'm building a new top floor with loose timber, creating some rooms and a bathroom. I'm laying chipboard flooring throughout and thought in a bright moment to "lower" the bathroom floor so there wouldn't be a big height difference between the bathroom and the rest of the top floor (considering the underfloor heating, etc.).

The trusses and floor beams have dimensions of 220 (spacing at cc60). Between these, I have placed studs with dimensions of 195, so the floor is now framed at cc30. After this, I cut down the floor beams by 25mm, so that 195 is also achieved here, where the bathroom will be. Lengthwise, I attach the floor chipboards to a screwed and glued stud (set at a 195 height against the outer 220 beam), so that's probably not the problem... The problem is how I go from 195 to 220, cc30 to cc60, perpendicular to the beams? Of course, a wall will stand here, the question is how? The options I see are:

* Place the wall on the bathroom floor, on the floor chipboards.
* Place the wall on the higher floor, on the floor chipboards. Then there will be a gap (~5mm) between the bathroom floor and where the floor stud begins (or the floor chipboard).

If I had thought ahead, I might have accepted that there would be a slight height difference, but now it's already done, so I must solve the problem.

Does anyone have any tips???? Or am I smoked :eek: ???

I've attached a picture that might make the problem a bit clearer...

Regards,
Mattias
 
  • Illustration of floor joists with a height difference, showing a potential issue in floor leveling for a new upper floor toilet installation.
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Can't you put double 45s at the bottom of the wall and place it on the 195s. Then you have a stud to screw into from both sides (actually, 22 + 45 = 67mm at the bottom should be enough).
 
Off the top of my head, it feels like you should attach the floor chipboard to the sunken part and then attach the wall to the chipboard.

That somehow seems most right.
 
Thank you for the help...becomes a compromise:

Lower a 28 so that the flooring chipboard on the "upper level" can rest on it (this way, this chipboard gets support underneath). On this, I then place the sill (45). Against the 28, I then place the lower flooring chipboard.

Feel OK?
 
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