Hello,
The difference in levels between the bathroom floor and the room outside is becoming too large now that we are renovating our house from 1945. The bathroom will be approximately 230x190.
There is no bathroom yet. The span between the foundation wall (concrete hollow block) and the heart wall (concrete hollow block) where we want to build the bathroom is exactly 330cm.
Currently, there are floor joists measuring 70x195. These are notched 5cm at the bottom where they rest on the sill.
I would like to lower it by 5cm. If I were to continue with wood, I would like to use 145mm joists and notch them at the bottom so the top level comes down 5cm. But that would become very weak.
Questions:
I plan to fill EPS concrete between the joists or beams.
It will have tiles, ceramic tiles, and a mini bathtub.
Under the side walls (long sides), I can glue together 4 pieces of 45x145 with each other, then frame up with walls on a 120mm stud.
The difference in levels between the bathroom floor and the room outside is becoming too large now that we are renovating our house from 1945. The bathroom will be approximately 230x190.
There is no bathroom yet. The span between the foundation wall (concrete hollow block) and the heart wall (concrete hollow block) where we want to build the bathroom is exactly 330cm.
Currently, there are floor joists measuring 70x195. These are notched 5cm at the bottom where they rest on the sill.
I would like to lower it by 5cm. If I were to continue with wood, I would like to use 145mm joists and notch them at the bottom so the top level comes down 5cm. But that would become very weak.
Questions:
- Could I use 145mm joists if I place them at cc20?
- Could I use some form of steel beam instead?
I plan to fill EPS concrete between the joists or beams.
It will have tiles, ceramic tiles, and a mini bathtub.
Under the side walls (long sides), I can glue together 4 pieces of 45x145 with each other, then frame up with walls on a 120mm stud.
45x145 c24 s300 holds from a structural failure standpoint but may experience somewhat large deflection.
Why eps-cement?
I would have chosen a more notched 45x170 c24 s300 with mineral wool in between, then chipboard with underfloor heating on top, laid in 30mm reinforced self-leveling compound.
Why eps-cement?
I would have chosen a more notched 45x170 c24 s300 with mineral wool in between, then chipboard with underfloor heating on top, laid in 30mm reinforced self-leveling compound.
Last edited:
Hi,larsbj said:
EPS is included as an option from the GVK rules. And then I don't have to use chipboard that adds extra height.
45x145mm would be best height-wise. Is there any difference if you were to use more beams, it doesn't cost much extra.
Can you check in any table and calculate what a steel beam corresponds to a wooden beam?
This is something I would like to over-dimension and not worry about.
What value should I calculate for, kN/m2, when it comes to a bathroom, 5 square meters, wet room plywood, gypsum, tiles, ceramics, small bathtub of 150 liters. I have googled but haven't found anything that I've found valuable.
Then, how much deflection (mm) and bounce (mm) is acceptable in a bathroom?
Then, how much deflection (mm) and bounce (mm) is acceptable in a bathroom?
Normally, flooring in residential buildings is designed for 200kg/m2 (plus its own weight). If you calculate with 500kg/m2 in your bathroom, you should have both belt and braces. The practice regarding allowable deflection is span/400, i.e., 330cm / 400 = 8mm in your case. There should be no bounce at all, which is why the compartments are filled with EPS or usually self-leveling compound is used on floor boards.
Thank you!
Can the waterproofing layer, tiles, and clinkers withstand a deflection of 8mm?
So when calculating the load, should you specify column load 2 kN/m2 + self-weight in kN/m2?
If I use this guide (floor decking indoors), it wants to use 0.6 kN/m2 for a room with double gypsum and tiles.
http://www.byggbeskrivningar.se/dimensionering?Cid=931
Can the waterproofing layer, tiles, and clinkers withstand a deflection of 8mm?
So when calculating the load, should you specify column load 2 kN/m2 + self-weight in kN/m2?
If I use this guide (floor decking indoors), it wants to use 0.6 kN/m2 for a room with double gypsum and tiles.
http://www.byggbeskrivningar.se/dimensionering?Cid=931
140mm glulam should work if the maximum stud height is 145mm.
If the maximum stud height is 195, regular C24 works.
Gluing to the side of an existing stud adds almost nothing compared to just placing it next to it.
The function of gluing is when you increase the height of the beam.
If the maximum stud height is 195, regular C24 works.
Gluing to the side of an existing stud adds almost nothing compared to just placing it next to it.
The function of gluing is when you increase the height of the beam.