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Really tall door rules9/6
I have a project coming that the customer has requested a pair of carriage doors for 14' tall 12' wide opening. They will be an x braced frame and panel door possibly with glass at the top. Does anyone have input on ways to keep these straight? I have built ladder core doors at 10' tall that are 1.5" thick for the ladder frame with 1/2" shiplap faces that have stayed very true but these are a bit taller. How thick should I make them? I'm worried about weight so my initial thought are to build them from solid wood at 2.25" thick and use a very thick astragal to help hold the one side true and then a 3 point latch or multiple slide bolts to help it seal? I welcome any input even just to tell me I'm crazy if necessary! Thanks
I think your construction sounds legitimate. 1-3/4" core and 1/2" to 3/4" faces will be adequate. We have seen that to be extremely stable.
As for hinges, I think pivot hinges may be your best bet. Offset pivots from Rixson or similar maker. Calculate your weight and talk to the tech people to be sure.
You will not find the multipoint off the shelf. You can have a metal fabricator make the extensions. Some kinds of multipoints will be easier than others to extend. You will not get much of a backset on MP's, so think about that. If you make the doors 4" thick, I think the bevel will get in the way. But I think 3-1/4" to 3-3/4" should be fine.
Thanks for the reply David and all of your willingness to share your hard won expertise. Is there an online application or do I just show up at your shop door for my apprenticeship? There are a few others on these forums that I know I could learn so much fromas well. Back to the door question though, is there a guideline about how tall of a door can be safely made from just solid wood without lamination? I have, perhaps foolishly, built customer specced doors at 1 3/4" thickness at 8' tall with no issues in 3 west facing doors that are 3 years old. Those were white oak and mahogany. I don't feel comfortable with 12/4 material for these 14' tall doors but I don't have the experience to back up my gut feeling, can anyone offer an rules of thumb for the future? Thanks everyone!