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I am in the process of refining an intial design for an adirondack style chair based on a picture I saw in a magazine. I am using 14/16 white oak throughout. The vertical supports attach to the base leg with a lap joint. I'd like to know any best practices out there for securing this type of joint. Obviously, glue and screw is an option but I'd love to find a way to not have any screws showing. Any thoughts?

Thanks,

Tom
 

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That's going to be a nice chair!

First, I think glue and screw is not a good option because you'll have less than 7/16" of meat for the screw to bite, which won't give you much additional strength anyway.

You could cross-pin it with some dowels or square tenons, that might be a nice design touch. Orient them so they don't align on the grain, which might encourage a split.

In my experience lap joints are quite durable in a shear load like this. I have a bench that has survived 3 years of weather, with the entire load of the seat cantilevered off a similar lap joint. Make sure you use waterproof glue!
 
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