17'LVL beam sawmill shed opening

[LarryG]

I was thinking of using 3ply LVL beam for the main opening on my sawmill shed. Is this a good or bad thought to have the middle LVL longer to be the tenon going into a post. 

[DR Buck]

I used two 16" x 2.5"  21 foot LVLs for the opening under my over hang where the sawmill sets.   The only caution I would make is the cover the exposed side/ends of the LVL to protect them from weather.    They are not designed for prolonged exposure to the outside (rain/snow/etc) .  I'm covering mine with metal to match my building.

[Lostinmn]

I'm using LVLs on my mill shed loading side, but each end full has a full jack post supporting it. If you do as you described, I'd also have each end fully sitting on jack posts too.