Deck structure help

Hi folks,
this has probably been asked a million times, and I HAVE tried a search, but couldn't find an answer.

My question is... I plan to put a spa on top of a wooden deck. Problem is.. how do I determine the ability of the current deck to support the 2.5 - 3.0 tonne spa, and how do I determine how to strengthen my existing deck to support it if required?

Spa contains 1700 ltrs, (1.7 tonnes) PLUS
Dry Weight 350 kg (0.35 tonnes) PLUS say 6 people @ 80 kg each
People 480 kg (0.48 tonnes)

for a total of 2.53 tonnes.

Of course I have all the relevant measurements available, as in the attached document.
Hope some of you good folk can help me here.

regards
Mike

Attached Files http://www.renovateforum.com/images/attach/xls.gif Deck1.xls (29.5 KB)


Read the full thread at RenovateForum.com...