how much weight to fall through floor

The tank stand is wood? Take the square inches of surface area of the stand and divide the number of pounds by that number to find the pounds per square inch. I think you will be surprised to find that it is only around 3.5 per sq inch(still not light). So the answer is you should be just fine but the better you can spread the weight (1/2 plywood under the stand) the better. Floors are now made with particle/pressed floor I beams every 16" with 3/8 underlayment.They also run normally across the narrow width of the building. In a apartment building the load walls will run across the floor joists. I would check the lease and insurance just to make sure. Good luck........now if I ran 33 miles a day for 13.7 years how far........yah definitely 311 toothpicks defiantly.....

 

I have a 110g+sump+110lbLR+sand+me when im next to it on the 3rd floor of a 4 floor apt for 2 years now. landlord was not thrilled about it when i just put one in, i told her if the tank goes i go
Some things to look at:
Put tank against a load bearing wall if possible. most interior walls dont count. check to see which way your floor beams are place and place tank perpendicular to these (use a good stud finder $40). Last, have a stand that evenly spreads the weight, using a stand that displaces wight onto legs is a bad idea.
the plywood technique laf-n-gas talks about does not work that great and plywood will bend accordingly. the thought that a bathtub can hold lots of wight so my aquarium can too is not something to measure with as most structures are planed for these heavy load areas and will place more beams down in these areas to strengthen floor.
Do some google searches for something like "floor holding aquarium" and youll find some good reads.
heres a link to get you started: ----> http://badmanstropicalfish.com/articles/article28.html
P.S. im not an engineer or anything related so read what i wrote with some caution.

 

also if/when you fill your tank you'll notice the water surface will ripple when you walk next to your tank more then say a glass of water would... this is fine. it does not mean your floor is weakening. little creepy at first but its ok your rly not making your tank bounce/shake that much its just that larger volumes of water magnify vibrations more then smaller ones. e.g. put a drop of water in a cup and place on floor, see if you can get it to ripple when you walk past it..

 

oh sry, one last thing. i just read your UPGRADING from a 90 to a 125 so your adding about 325 lb with water+rock+sand but your widening and lengthening stand as well which will displace a larger ratio of wight so i think your in a good shape as long as you read above remarks ^^^^.

 

I had a 125 gallon in my 2nd floor apt and the building was build in 1967. I did get permission from my landlord and I also got renters insurance before even asking. Renters insurance was only 100 bucks for an entire year. $500,000 coverage. I would highly suggest that even if you can't add a tank, its well worth it for only 100/year.

And yes, your tank will appear to bounce. I used to have to tell people to chill out when playing guitar hero standing up next to the tank. Sometimes the water would wave a lot, especially when someone was bouncing right next to it. Very scary.

 

As a fireman, I would be worried about going into the apparment below yours not knowing there was a tank that large up there. If that was known, I can assure you no firefighters would be allowed anywhere near that appartment.

 

in a fire dont most tanks break? or atleast the stand..

 

It depends. If there is a fire on the floor below the appartment with the tank, I would be way more concerned with a collapse occurring.

As for a fire in the room of the tank, depending on the amount of heat made in what ammount of time generally determines whether or not the glass breaks, or the stand fails. If you have a smaller, smoldering type of fire that gradually raises heat, the stand would be more prone to failing, since the wood would actually ignite and burn even though the glass is still holding. Now if you were to have a room with lots of fire load, and some air getting to it (basically a free burning fire, or a fire that has vented through a window or door) the glass would be more prone to shatter due to the difference in temp from inside the tank to outside.

Does that make any sense?

 

Makes perfect sense.. Thanks for the explanation K+

 

As a fire man, you would probably be happy to hear there is an extra 125g of help in the house.;D

Anyway, were you able to tell if the wall is lad bearing? Also, find out how old the building is, usually they were built better ack in the day then they are now.

I guess, the main thing is making sure the condo rules allow it.