Architecture - Laminate Beam

I am having an addition put on my ranch house. The contractor has installed a 28' (3.5x16) LVL beam where the existing outside wall is to connect the existing space to the new space. He has supported the beam with a 4x4 post on each end.

Question is, is a 4x4 post on each end enough? It is just holding up the existing attic joists and the new attic joists. The have also built some supports to support the new roof rafters. 28' and only a 4x4 on each end seems to little. Seems there should be some support towards the middle.

Thoughts!!!!

LVL's are terribly strong. They are designed to hold large loads. If your contractor put in a 16" deep one, I can tell you that it is very strong and the chance of any bending in the middle are very slim. I would say that a 4 x4 on each end would be plenty sufficient as long as they are secured properly.
I would use them.

This may be a little late, but maybe it will help someone else who stumbles across this.

I agree with Jack in that LVL beams are immensely strong (and expensive) and are generally only used when absolutely necessary for that reason. However, 28' is quite a clearspan. I am unsure of what is bearing on this beam as I am having a hard time visualizing your brief description. I will say that (2) 1.75x16 (which is what you have) will exceed deflection limits and possibly fail if placed under uniform load of more than 170 lbs. per linear foot. That is a very light load. That means this beam can only hold trusses spanning 7 to 8 ft. Maybe it is a small addition? Basically what I am getting at is that this beam will carry next to nothing and is more than likely being used in conjunction with other structural elements to distribute the weight.

Maybe the trusses run the other way?