Hi, Kenton. I think you may want to re-consider this regarding radiant barrier installation. It needs to be on the bottom of the truss top chords as its purpose is to reflect the UV rays back up through the roof so they do not heat up the attic space.
It can be done either way. for new construction, it gets put on before the decking, and there is a sag left in between the trusses for ventilation.
If you install it after the decking is on, it gets stapled to the bottoms of the trusses and the air from the soffit vents goes between the foil and the decking.
Ideally you add a ridge vent and all the air escapes through the peak of the roof.
Here is where I got mine: Attic Foil