If your apartment building is all concrete then you have nothing to worry about. What is that 180g sump sitting under anyways????
Hello; I researched this issue some time back. I found some references that stated a concrete floor may be built to a number of standards. While many are built to quite high load capacities, some are no stronger than an equivalent wood floor. It seems to depend on the thickness of the cement and the way the other support structures are put together. Apparently a coat of cement can be put down as a durable cosmetic finish and not necessarily be stronger than other type of floor.
One thing to bear in mind is that nearly every time such a floor capacity question is posted on the forum, someone will post saying something along the line to go ahead and not to worry. I responded to a thread in the last few days in which a member posted pictures of structural floor damage from the weight of an aquarium. The debate has gone on for some time on the forum with several contending that there has been little evidence of any structural damage from the weight of aquariums. The pictures in this thread should be sufficient evidence to prove that false. Here is a link to that post for your consideration.
http://www.monsterfishkeepers.com/f...-out-there-Question-about-reinforcing-a-floor
Hello; here is a good general link
http://badmanstropicalfish.com/articles/article28.html
Hello; I believe one of the following links discusses the issue of concrete floors.
(OLD RECYCLEDPOST some words may run together, this happens when I copy and paste to the forum)) Here are some web addresses about floor capacity. The first address is a new one from a post by another Monster Fish forum member a while back. Here are the addresses again with the first being new to the list. Floor capacity depends on a lot of criteria; there is not a simple answer to the question.
This web address is added to the list
http://www.cichlid-forum.com/articles/aquarium_weight.php It is perhaps the easiest to follow.
http://www.ehow.com/how_7485788_calculate-floor-load-capacity.html
The web address above is a site about calculating load capacities of floor joists. They use a formula for the strength of a beam:
I looked at some other sites (Addresses listed below) and found a discussion of static loads and live loads. Two sites describe how to measure the deflection of flooring due to weight loads.
http://www.johnbridge.com/vbulletin/deflecto.pl
http://www.awc.org/calculators/span...d=10&submit=Calculate+Maximum+Horizontal+Span
I found these sites interesting but hard to pin down for a general rule of thumb. Too many variables involved; Type of wood, condition of wood, dimensional lumber or engineered truss, age of wood and on and on.
http://www.eng-tips.com/viewthread.cfm?qid=62845&page=10
http://badmanstropicalfish.com/articles/article28.html
To answer your specific question. I found an engineer a few years back by asking a realitor. The realitor I was working with knew someone who would look at houses.
Good luck