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Ellen, Consultant
Category: General
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Experience:  attorney and legal researcher
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I want to install a modern bathroom in a building from 1900

Customer Question

I want to install a modern bathroom in a building from 1900 in which floors are supported by wooden beams, pine or fir. I want a concrete bathroom floor measuring 210 cm x 310 cm placed on beams with cross section h = 16.5cm, w = 14.0 cm, gap between beams = 95 cm, distance between brick walls supporting ends of beams = 520 cm. Thus, the concrete floor will rest on just two of these beams.
Is this possible? Which thickness of the concrete floor is allowed?
With the concrete poured on steel sheets with swallow-tail profile (don't know correct technical term in English), the floor will be 50 mm thick, incl. the 15 mm thickness of the profile which isn't all concrete. Are more old-fashioned construction calls for approxim 10 cm of concrete.
I am also curious about how the calculation is done, the formula or website doing it. I understand fancy math, so lay it on.
Submitted: 2 years ago.
Category: General
Expert:  StructuralEng replied 2 years ago.
It sounds like you have more than one question here. We should keep each question limited to one question. Would you like me to submit an additional service offer to address all of them here or would you rather I answer one here and ask additional questions for the others?

What kind of floor finish will you have on top of the concrete?

Will the beams support anything other than this one floor?
Customer: replied 2 years ago.

Never mind.

I found this:

Expert:  StructuralEng replied 2 years ago.
No problem. Good luck with your project. I do feel obligated to tell you the website is seriously lacking in information. Some of it makes assumptions that are I conservative and there is much more that goes into it than sizing for the bending moment. I'm sure you'll figure it out, though.