We want to open up the floor plan of our house by removing the center wall.
The roof is 4:12 pitch with 3x8 timber rafters 4' on center, a 3x10 timber ridge beam, and 2x8 tongue and groove boards above. On one side of the house, there are 3x8 timber rafter ties 8' on center (every other rafter) that connect to the rafter at the exterior wall plate and span 15' to rest on the center wall.
The other side of the house has 2x8 ceiling joists with hung ceilings that also span 15' and rest on the center wall. There are no 3x8 timber rafter ties on the ceiling joist side of the house. The total span is 30' (15' to the middle of the center wall).
We would like to remove all the hung ceilings and ceiling joists from the one side of the house to expose the timber rafters and tongue and groove cathedral ceiling above, and remove the center wall to open the floor plan.
Can we make trusses out of the existing timber roof structure by splicing new 15' rafter ties to the existing rafter ties and adding 'W' support timbers mid-span fastened together using typical 5 finger timber truss base fan plates?