Hardware for Heavy Bifold Doors
From contributor B:
Hager has some heavy duty bi-fold kits as does Hafele. I know the Hager comes with a 4x4 standard bearing hinge, which I would think could be swapped out with a ball bearing model if you requested.
From contributor C:
Wow! 4" thick? You don't mean cm? Sounds like old hacienda doors with a twist. Assuming you're doing bastidor (because of the weight limit of 57kg per door), I wouldn't have a problem with the Johnson system. I've done a few sets using them and I find the quality far superior to anything else, including Ducasse.
From Gary Katz, forum technical advisor:
I think you're talking about bi-fold hardware and not butt hinges; or are you talking about using both? I've done that, but it's tricky. And even if you're not, I think you'd be safe to use either the Johnson or Hagar Heavy Duty track and trucks (carriages). I've hung 6/0 x 10/0 doors on that hardware with no problem. The real soft spot when hanging a heavy door on a bi-fold carriage is that your screws are driven into the top of the door, and with a 5" stile, most of them will be into the end grain. I found the risk was in those screws stripping out. In one case I mortised out the top of the door and inlaid a tenon-like block of hardwood set in epoxy, then fastened the screws into that. Just a thought. 4" thick doors are going to be pretty heavy.
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