Deck and Veranda Questions

Hi All, and thanks in advance for any information.

Currently I am drawing/designing a deck and veranda as part of our renovation.

The 1930's house is clad with hardwood frame which are 100x50 on the external wall.

My wife and I would like to put a 6.3m x 4.8m deck. It would be approximately 2m off the ground with a butterfly colourbond roof at 5 degrees, which drains back to the original gutter on the house's roof eave (approx. 500mm from the house wall)

I have been looking at span tables and am struggling to design the veranda beams and rafters.

Currently I have a bunch of 140x38 Seasoned Blackbutt that I would like to incorporate to save some dollars.

I was thinking of using:
140x38 Blackbutt for Rafters (4.8m span) at 900mm centres
140x38 Blackbutt for Wall Ledger
240x45 Unseasoned HWD for the V. Beam (with a post in the centre to reduce span to 3.15m)
90x90 HWD posts throughout.

Could someone verify if this is the way to go. I would really love to remove the centre post for the V. Beam. Or is there a cheaper alternative without going to a LVL?
And is the original gutter going to handle the extra water from the additional roof area?

Thanks,
Phil.


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