<a href=showthread.php?s=&postid=11905973#post11905973 target=_blank>Originally posted</a> by msman825
get you a couple twist jacks to go in the callar under the floor joyces. contact your builder tell him too get ur done
I was in your same exact situation in November.
I was going to suggest jacks too. But that's assuming the basement isn't finished and that he can put the jack where he wants it. In my case they weren't an option.
My situation... I have a new house with the engineered I-joists. My 125 is on an interior wall and is parallel to - and stradling - two joists. One end is about 6' from an exterior wall - the other end is about 8' from the main beam of the house.
I contacted a guy who does the structural design (ie. load calculations) for houses - he asked me a bunch of questions about my joists (size, distance apart, span from wall > beam) and he calculated that EACH of the 2 joists my tank is on would hold close to 3,000 pounds. Your builder should be able to hook you up with someone who can run these calculations for you - in my case it was someone at a lumber supply yard where they do actual load design and calculations.
In the end my 125g is extremely stable - and that's with all the water in the tank, 100# of aragonite substrate, 150# of live rock, the stand, canopy, 10g of ATO/kalk water, 25g in a 40L for the sump and all the lighting/pumps/etc to go with it. Don't forget that your rock will take up some of your water space - my 125g is left with probably 90-100g of tank water after the rock/substrate did it's displacement. Yeah you still have the rock/substrate weight - but you don't have 125g in the tank anymore.
I'll give you the same advice people here gave me - ask someone who can do the actual calculations for you based on your just type/size/spacing and span and take their advice. I'm glad I did - or I'd have a smaller tank instead of my 125g - which I'm already thinking is too small.
A builder is gonna say "no" just so there's no way he can be held liable. But he obviously has no clue how much a tank weighs if he says 1.7 tons - so he obviously can't give you the right answer.
