The question is, would the extra 14" span of the metal frame be able to support the weight of the block and top plate? Or would I need to weld a plate along one side of the header? Not sure what the gauge of the metal frame is.
OK, focus on this one item for a second, I’m going to say it as directly as I can. The door frame has nothing to do with holding what’s above it. They never do. The way your place was built was wrong. There should be a structural header above the door frame supported on the wall on both sides that extends a couple of feet over the block on either side.
Usually, when it is done with block, the top blocks on the walls have something like a piece of sheet metal that is inside between the upper/lower blocks (smaller, inside mortar ring) to hold concrete in the gap. The six or eight blocks across the top are drilled laterally and a couple pieces of rebar are extended across the top and to the first couple of feet of the block on either side, and then the cavities on the top row are filled with mortar. It’s a concrete beam.
The block on top of your door is just sitting there. If the roof wasn’t there you could push them over, and you can see that they’re all cracked. Probably the worst thing you could do is leave some of it in place and do something else for the new section. If you don’t want to do the triple 2 x 8 beam, I can come up with a dozen alternatives, but there has to be a header across the top that sits on top of the walls not the frame. Comprende Amigo?
The reason you use the wraparound door frame and you cement the gap between the frame and the block is only to keep individual blocks from shaking loose as you open and close and slam the doors. Masonry shakes loose if agitated, it’s used because it’s durable as long as you protect it correctly
However tall or wide you make the door opening, itstill should have a header on top. Two 2X12s Glued together will definitely do it over 10 feet, tens would probably be adequate. The reason I’m saying eights with the plywood spacer is because it’s the same dimension as the block. When you put it in, and paint it, it’ll disappear. The whole building would come down before that would crack and fall.
as regards the size of the opening, of course do what you really want to do, but I think I’m hearing between the lines you want to keep the change as minimal as possible for cost and so you don’t modify the building that much. If I had a couple of bucks and I had the building, I’d probably replace the headers over the doors even if I didn’t change the doors. If it were my building, having done it a zillion times, 90% of it is the labor, so I’d make the door as wide and tall as I could before I ran into a lot of extra money. The last thing I drew up where you can actually raise up that part of the roof is a little bit more money, but it’s peanuts in the grand scheme of things.
The metal frame is there to keep the block on the sides from breaking, it does not support anything. It just dissipates the stress is on the block.
Once you cut your opening and reinstall the metal frame, you just have to grout and seal the little cavity between the frame and the block. If the frame is anchored, you could do this with expanding foam.
As regards anchors to hold the frame to the Block, if that’s even necessary, drill a hole through two or three webs of the block. Then punch a little hole in the block from the inside or outside at the end of that. You’re breaking the little hole so that you can put in a wood plate, maybe 4“ x 6“ so the bolt isn’t pulling directly on the block itself. And still seal the gap.
And, from what I’m seeing, the frame has to come out to come out to remove and reset several of the loose blocks on the side. So it’s nothing once you expand the top to turn the frame around so the hinges are on the outside.
an afterthought, I don’t know if you know how that frame comes apart. If you chip loose the bottom of the verticals, and you pulled them inward At the bottom, they are hinged into the top piece. Just make sure you don’t break your brain, when you pull the verticals out there is nothing supporting the top, it may just calm down. Put a couple of 2 x 4 studs on the renAt the bottom, they are hinged into the top piece. Just make sure you don’t break your brain, when you pull the verticals out there is nothing supporting the top, it may just calm down. Put a couple of 2 x 4 studs under it, probably get a helper when you do that one item.
I hope it helps! What else?