A twin door goes to a different production line than your stock singles, staffed by the most experienced builders in the shop. The tolerance stack is the reason. Quote it as a built unit, not as two slabs, and confirm the lead time before you promise a date.
Four lines, four kinds of work
At the counter, a twin reads like a bigger single. Two panels, one opening, one line on the quote. On the exterior floor in Monroe, it goes to a different line and a different group of builders.
The exterior door department runs four production lines. These are the 1-3/4 thick doors that go on the outside of a house. Front doors, back doors, the door from the garage in.
One line runs single doors: molded, steel, and fiberglass.
One is the custom line. That's where doors get trimmed down in height or ripped in width. Dutch doors run here. So do the short doors cut down for attic and crawl space access.
The Commander line runs all wood singles and builds all wood twins.
The fourth line, at the far end, builds fiberglass and steel twins. Center hinge units. Patio doors with a screen. Singles with sidelites, twins with sidelites, twins with transoms on top.
The split isn't arbitrary. It follows who's standing at the table.
The skill sits at the end of the floor
Jason Gert has been with Tucker Door for 28 years. He puts it plainly. The twin builders are the most experienced people in the shop.
These units take a lot more making sure your tolerances are correct, so it takes an increased skill set. Most people cannot just walk in off the street and start building these units.
Jason Gert, Production Manager
New hires don't start there. The path runs the other way. Someone new starts in the interior door department, learns the work, and moves across into exterior over time. The builders on the twin line are mostly 10- to 20-year people. The ones who aren't came in from other door shops.
Tolerance is the whole job on a twin
A single has one panel in one frame. One gap on the hinge side, one on the strike side, and the head.
A twin doubles the panels and adds the meeting point between them. The astragal has to be right. Both panels have to be true to each other and to the frame. The sill has to sit flat under both.
Put a transom on top, and the assembly has to stay square as it gets taller. Add sidelites and it gets wider before it ever leaves the table.
Every one of those is a place a small error can hide. On a single, a small error is often a small adjustment. On a twin with a transom, it stacks.
That's why the experienced builders are down there.
It's also why performance testing on exterior assemblies is done on the whole unit rather than the door alone. The Window & Door Manufacturers Association runs its certification program that way for the same reason. The assembly is the product.
What this means when you're quoting
Ask what's around the opening. Sidelites, a transom, center hinge. Those change what gets built, not just what gets priced.
Don't assume the same lead time as a single. Twins run on different lines than your stock singles. That changes by plant and by week, so check with your rep before you promise a date.
Treat a field mistake as a remake, not a swap. On a stock single, you might pull another slab. A twin with sidelites and a transom is a built unit. Getting it wrong means building it again.
Get the rough opening confirmed before it goes in, not after the framing is up.
One roof, one truck
The reason twins, radius tops, and cut-downs all live in the same building is that we build them. The machining and the prehanging happen here, not at a third mill down the road. If something needs sorting out on a twin, the person who built it is down the hall from your rep.
Slab, frame, sill, glass, and finish go out as one unit, on our trucks and our routes.
If you have a twin coming up with a transom or sidelites on it, send the opening over before you quote it. You can configure it in the Tucker Design Portal or call your rep. We'd rather talk it through once than build it twice.
Questions on this one
Can you build a twin with sidelites and a transom as one unit?
Yes. That's what the twin line builds. Singles with sidelites, twins with sidelites, twins with transoms on top, and center hinge units all run there. Send the full opening, not just the door size.
Do twins run on the same lead time as stock singles?
Usually not, but it depends on the week. Twins run on different lines than your stock singles, and the mix on those lines changes. Your rep can check the floor before you commit to a date.
What do you need to quote a twin?
Rough opening confirmed on site. Slab material: fiberglass, steel, or wood. What's around it, meaning sidelites, transom, or center hinge. Hardware prep, including any multi-point lock. Sill type and finish. Missing any of those means a follow-up call before a number comes back.
Can a twin be cut down in height?
Sometimes. Cut-downs run on the custom line, and what's possible depends on the slab and the construction. We would need to confirm that on the specific unit rather than answer it in general.
Quote it in the Design Portal, or call and talk it through with someone who has built it before.
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