Done all the time.
2 piece attic trusses overhang for deck.
Pieces of 2 by 4 inch lumber are placed between the trusses underneath the decking to keep trusses straight.
You also need to ensure that the joist spacing is adequate.
In many others.
After setting the second truss in the same manner workers attach a ridge beam to the peak of both trusses.
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.
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.
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.
The standard spacing is 2.
Install these over your existing horizontal 2x6s 2 feet from the roof edge inside and paralel to the roof ends crosswise from your existing 2x6.
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.
This makes the roof ready for decking or sheetrock.
The beam extends to the far end of the roof hanging over.
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While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.
This length can easily be changed to fit the need of the truss.
The distance between trusses.
Attic joists for live loads.
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.
At the ends have the truss mfr make some dropped top chord outrigger trusses.
2 overhang is usually no problem obvioulsy pending loads involved.
If the attic is being finished for living space these pieces called scabs can be installed flush with the trusses to provide areas for sheetrock or paneling to be nailed to.
Joist dimensions are only part of the equation.