How can balloons be used to lift a house?

[Numeriprimi]

I have one interesting question :-)

How many balloons would be needed for lifting house? Which variables need to know? How can I calculate it for a particular case? (my house :-D)

Thanks very much and sorry for my bad English.

 

[A.T.]

https://www.youtube.com/watch?v=7xVix2BM4gk

http://phys.org/news/2011-03-house-balloons-flies-world-video.html

http://en.wikipedia.org/wiki/Buoyancy