Hello! I have bought a sloping townhouse and am in the process of leveling the floors on the upper floor. It slopes about 3%.
To get the floors on the upper floor to the same level, I would need to notch the joists to lower the floor along one side, towards the outer wall. Today they are 75x220mm on a 500 mm center-to-center distance and have a span of about 4.2m. I would need to cut a wedge from 0 to 100mm on the ridge furthest away over a length of 3.3m. On the closest ridge, about 0-70mm. There's a sloping roof, so it's not needed for the entire piece. This would leave approximately 75x120mm on the furthest ridge and 75x150mm on the nearest one, as it also slopes slightly sideways.
Since the adjoining rooms have already been leveled, I would prefer to lower this floor.
I plan to reinforce this by screwing and construction gluing new beams on each side of the old ones, as high as possible, across the entire span.
Is it feasible to reinforce it this way? A construction company I spoke with thought it would be too weak at the outermost part where it's 120mm, but believed it would be fine if I managed 145mm.
After looking at some guidelines, I think the joisting might be over-dimensioned as 45x195 c24 or 45x220 c14 should suffice if it were straight.
If I then add 45x145/120 on each side of the old ridges, the center-to-center distance also decreases to about 400mm. Then I plan to lay 22mm glued flooring chipboard and a click floor.
Will this work for a typical indoor floor under a sloped roof where nothing heavy will be stored?
Link photo:
https://docs.google.com/open?id=0B9H2ONh2xzLiMzNjZDU0YjMtMzYzZi00YTRkLWIyMmMtYjIxM2I3MDEyYjZj
Photo 2
https://docs.google.com/open?id=0B9H2ONh2xzLiYmUzZDYyM2YtMzk3ZC00MjdhLTgwZTctYmEyNDc2MmExNTg4
Link image model new ridge
https://docs.google.com/open?id=0B9H2ONh2xzLiMWU2NzJmMmQtNjk5Yy00ZjdlLWI3NDMtM2M5MGY2YzlmYTQz
