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Japanese Tie Beam to Plate Joinery #22475 02/01/10 04:14 PM
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timberwrestler Offline OP
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I've been wondering what the most effective joint for joining round tie beams to the plate would be. I'm guessing a cog of some kind. It seems like a dovetail would be putting a lot of dependence on a very small amount of wood. I could drop the ties into the posts, but I would rather not. There's a few options shown in Engel's book.

Thanks,
Brad

Re: Japanese Tie Beam to Plate Joinery [Re: timberwrestler] #22478 02/01/10 08:20 PM
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Chris Hall Offline
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Hi Brad,

thanks for posting up the question. The three versions shown in Engel's book comprise the standard choices. As Engel and many others have noted, the housed dovetail is a weak option. If one goes with the housed dovetail then a reinforcing tie bolt is required to tie the beam horizontally to the plate.

The cogged lap joint is the best option, if you're looking for structural effectiveness. There are a couple of different versions besides the one shown in Engel's book, however what he does show is fine. Engel does however mis-name the cogged lap joint illustrated - it is not, as he calls it, a variation on kyōro gake, it has its own name and is called tsuki-watari ago

~Chris


My blog on carpentry practice, East and West:

https://thecarpentryway.blog

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