Update....
The existing PEMB was built in the early 80's. Its an existing church that had classrooms around the perimeter with the sanctuary in the middle portion. Now the sanctuary is expanding to the out-to-out dimensions. There will be (2) existing frames that will be modified. The truss idea...
I've got a project where the existing PEMB has frames at 20' on center. Out-to-out of PEMB frame is 120' with interior columns approximately 20' from the exterior column. The owner wants to remove the interior columns. Has anyone done this?