Done all the time.
2 piece attic trusses overhang for deck.
Attic joists that are made from 2x8s may be acceptable for building your attic floor but because every room is variable there are no absolutes.
Take 2 6x4 as long as your longest stored lumber and cut 2 inch deep grooves in them as wide as your 2x6 is thick every foot or so.
Bracing for extra support.
The distance between trusses.
A common misconception is that it takes little more than the installation of some decking over the attic joists to ready an attic for move in.
Attic joists for live loads.
In many others.
After setting the second truss in the same manner workers attach a ridge beam to the peak of both trusses.
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These have their top chords dropped 3 5 or 5 5 so that you can run 2x4 s or 2x6 s over those chords to support the overhang.
Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs.
This makes the roof ready for decking or sheetrock.
If the overhang is more than around 2 6 it will require a 2 6 top cord for the tail section to handle that amount.
While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.
In some houses this may be the case.
The standard spacing is 2.
Joist dimensions are only part of the equation.
This length can easily be changed to fit the need of the truss.
The beam extends to the far end of the roof hanging over.
Pieces of 2 by 4 inch lumber are placed between the trusses underneath the decking to keep trusses straight.
2 overhang is usually no problem obvioulsy pending loads involved.
You also need to ensure that the joist spacing is adequate.