Can LVL beams be used with spacer blocks in the center to flush the LVL material up on each exterior side? For example when using two 1-3/4" thick LVL's with 2x6 trimmer material it only comes out to 3.5", so can you use 2" spacer blocks between each LVL to flush them up? Or must they be glued & nailed together with an artificial spacer material on one side?
As backstory, there was no specification on whether the LVL needed to be sistered & nailed per typical LVL nail schematics from the engineer. They didn't even ask the floor joist length which was bothersome. Both lumber yard and building department seemed okay with having the space in middle be hollow, but I was curious in terms of support if the LVL in a box header format functions differently. I don't see how because it's bearing equally on trimmer studs, and now has a larger footprint in terms of load point. Wanted to know if builders or engineers had third opinion.
Edit to add: Engineer okayed this. Said that technically one LVL was enough for the load. When I asked if this would work for two when needed he said "I don't see why not, as long as they can not separate from one another and touch at same points" which is what the structural lags and top plate above the LVL do.