Steel I-Beam Filler

There has to be more to this story than what you posted. If the beam needed to be reinforced after 40 years, why? Are you trying to sell? That jack post in the photo isn't attached to the beam. Was that a recent addition? Were there any support columns along the beam? That S5 looks like it originally spanned a good 20 feet or so, if that jack post is a temporary. Is that somewhat accurate? Assuming there is living space overhead, my gut reaction is yes, it looks under sized if it spans 20 plus feet. An S5 isn't the best choice there. And why reinforce with wood? Did a contractor put you in touch with the engineer, who put together a wood reinforcement plan that the contractor could handle without welding?

But me second guessing another licensed engineer via a web forum isn't something that will get you any closer to a solution. You asked how to make the attachment. The answer should come from the engineer.

Midicat,

I would suggest to you that a welded reinforcement would be quicker and look less like a Frankenbeam than wood reinforcement. We've done a few beam and bar joist reinforcement jobs, and they go pretty quick. If that post is existing and it has a proper footing, and all I had to worry about was the beam, I'd be in and out of your garage in a day (assuming the calcs worked out).

I would suggest that you speak to your engineer and tell him you want to see an alternate scheme in steel. He's already got the beam loading calcs done. It shouldn't take him too long to find something like a WT section that could get stitched along the bottom of the S5. He'd have to give you a detail on some web stiffeners, especially at the column, and possibly something to restrain the beam. But he could check all of that. As for jacking the joists while temporarily removing the post, that would take my guys maybe an hour to do, but we have the equipment to do that. No doubt you could find someone in your area to do that as well.