I am remodeling a small room 12x12 and want to vault the ceiling by inserting a scissor truss alongside the existing conventional truss. The existing and proposed trusses are both 2x4 members 2'-0" o.c and the span is 12'.
The desired result is to sister the scissors truss onto the existing along the top chord and then remove the vertical web and bottom horizontal chord of the existing truss. This approach is being taken to preserve the existing roof.
What would be the recommended fastener type, size, spacing/pattern and construction adhesive needed to properly attach the two chords. Can you site a code or similar design reference that will satisfy a local building inspector?
The image attached shows the desired result. The blue top chord of the existing truss are to remain and the red new scissors truss is to be sistered along the top blue chord. The image also indicates 2x4 blocking between the trusses (white elements) for drywall. Any code or design guide references for this type of connection are appreciated.