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27th June 2023, 10:07 PM #1Senior Member
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Joinery for bath stool in wet area
Hello,
I have some especially nice Cypress boards that will be perfect as bath stool. Like this.
azmaya-hinoki-bath-stool-japanese-cypress-wood_top.jpeg
Stopped mortice and tenons or floating tenons with Domino using a bit of Titebond III would probably be totally fine.
Anyone got a better idea, or know a more traditional way that is suitable for this application?
A bit more details
As far as I understand, Japanese Cypress (Hinoki) is typically used for this with no oil/finish, because the species has rot resistant properties and handles wet/humid conditions in bathrooms. These stools gets wet, but not submersed in water or left sitting in puddles.
I'm curious about joinery options.
I've seen knockdown versions that use keyed mortice and tenon joinery for the brace. That seems sensible for possible wood movement, but it looks a bit agricultural and not to my taste. I haven't seen one with a through tenons on the seat pad. Probably because it would be prone to water penetrating the end grain and causing problems. Mostly, I've seen them similar to pictured, and I prefer that.
There is probably a special Japanese joint specifically for this... but I can't find my book!
Cheers, -RW
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27th June 2023 10:07 PM # ADSGoogle Adsense Advertisement
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27th June 2023, 10:36 PM #2
Something like this.
Mortise and Tenon - Fox Wedged (aka Jigoku-kusabi) - YouTube
Should not need glue as far as I can see for your application. Never been brave enough to try them myself as when you bang it home it aint coming out again.
Regards
John
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27th June 2023, 11:06 PM #3Senior Member
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That’s the one!
Very clever joinery.
Looks pretty finicky though. I think I’ll just use the domino!
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28th June 2023, 09:30 AM #4Senior Member
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The foxed wedged tenon is a good solution. Doing them on an angle lends more difficulty on assembly since the sides are inserted at opposing angles. Whether you do it foxed wedged or floating or fixed tenons, the angles mean the stretcher below can't be fully seated when you insert the sides into the top, and all the joints have to be wiggled together bit by bit simultaneously.
I agree that you don't want the side's tenons piercing the top and exposing their end grain to water.
Another Japanese joinery option is to use a sliding hidden dovetail, like this:
Desk 3.0 - Design 3 - Big Sand Woodworking
But doing those dovetails at an angle would certainly be a challenge!
I'm looking forward to seeing what you decide.
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28th June 2023, 02:12 PM #5Senior Member
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Another interesting solution!
I've decided to just go with floating tenons. Good advice about wiggling the joinery home in small increments. That'll be tricky, but less tricky that the other solutions, especially given the angles.
I'm gonna mock it up with some cheap stock before I try it with Cypress.
I'm sure I'll share some pics when it's all done!
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28th June 2023, 03:21 PM #6GOLD MEMBER
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how do you do floating tenons/domino on the angled connections? eg the legs to the top or the bottom rail to the legs?
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28th June 2023, 04:49 PM #7
Been thinking about through tenons for that application and as the wood has natural resistance to moisture in any case getting the end grain wet should not be a big deal. Treenails got used in boat building for hundreds of years. The water would be keeping the joint tight.
Regards
John
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4th July 2023, 08:43 PM #8SENIOR MEMBER
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5th July 2023, 02:42 PM #9
When I was a kid in a rural area, most families still had one or two house cows. My grandmother hand milked her two cows morning and evening 365 days a year using a small wooden milking stool. Every one had almost identical stools.
Milking Stool.jpgGeneric Milking Stool
The stools were almost always made from huon pine, the legs were from branches adzed to approimately round and they were wedged into holes in top - highly polished from 100 years of use!
When I first visited Japan as a student in 1968, I was surprised that almost identical stools were in use in most sento and onsen (public baths and hot springs) except that they were made from hinoki. I was last in Japan just before lockdown and, alas, 90% of onsen stools were plastic - progress?
In both cases, the stools almost always had three legs as they are stable on uneven ground.
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