building under an already finished roof

[mcalko]

Hello, I have an 16x30 roof built over an existing deck.What is the best procedure for enclosing this space ? Build walls then floor over existing deck boards? the roof is being supported by 6x6 posts in the ground with concrete footer.I am planning to frame the walls up to the roof ,wrap,sheath with osb and side.then put in floors over the deck and go from there is this correct? Thank you in advance

[Cole]

I would consult an engineer about what you want done.

But yes, your plan is correct.

You just want to make sure you have enough support so it doesn't collapse.

[mcalko]

The roof is being built by an roofing pro with architech designing it . I am going to do the walls and cover the existing deck. The deck is supported by 2x12 yellow pine and a 4x4 posts sitting on cement footers.do you have a an opinion on sheathing?what should i put directly on the existing deck under the walls treated lumber for a sill plate ?