Too Big Bearer Span

Hoping you can provide some guidance - not sure if I have been misled!!

Building a floor for a cubby house, total size 3.0m x 2.2m.

With bearer span being 3.0m and wanting to get away with post at either end only (no post in the middle), I consulted span tables which suggested I needed at least 150x50. All good to this point....

I then headed out to buy timber. I was talked out of 3m x 150x50 and was told instead to go 2 pieces of 3.0m x 90x45 treated pine and screw them together (to effectively create 90x90). These have been bolted to the cyprus posts.

The frame for the floor is now together and I am worried that I am getting too much flex. Am I pushing my luck with 3.0m span with this wood?? It will mostly only be 2 kids in the cubby (plus weight of cubby, of course), but I want to be sure it will be safe.

Comments, thoughts, advice please?

Thanks.


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