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The Natural Philosopher

The Medway Handyman wrote:
wrote:
The existing joists are 4" by 2" and are at present supported by
sleeper walls at 5 foot centres, the spacing between joists is 10"
with no noggins.
I built a deck for 2000kg hot tub last year. 6 x 2 joists at 12"
centres supported every 4'. Not a millimetre of movement!
Remember the depth cubed factor though - 6" is more than 3 times
stiffer than 4"

I didn't know that - where could I find out more?

Take an engineering degree.?