designing waterfall butcherblock island

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Forum topic by kenzaburo posted 05-15-2013 09:47 AM 2093 views 0 times favorited 1 reply Add to Favorites Watch
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1 post in 2010 days

05-15-2013 09:47 AM

Topic tags/keywords: waterfall island butcherblock

Hi all,

New to the forum and relatively new to woodworking. For about four years I’ve been doing a lot of remodelling from framing, to plumbing, electrical and building some simple furniture. Jack of many trades, master of none.

The goal is to build something like in the attached image: an waterfall island/table. I have two 1.5”x73”x39” oak butcherblocks (of which one will be cut in half) On one side, there will be two back-to-back cabinets (for a total of 36”x36” fooprint) and on the other side there will be bar stools.

My main question concern: will the butcherblock sag over time for that 36”x39” unsupported span where the stools will be?
do I need an angle steel frame to support that? maybe two 1”x1”x1/8” angle metal 12” from the edge along with long side of the island and 3 or 4 that run perpendicular on that (to create a torsion box)? (see 2nd image)

Also, I don’t want to miter the two slab edges. What are my choices for connecting the vertical and horizontal butcherblock pieces on the table side in a sturdy manner? Dowels? Epoxy? Another angle metal piece with pre-drilled holes for countersinking the screws?
(Don’t really like the look of dovetails) The angle metal can be painted black and would be ok since it’s not really visible.

The floors are sealed concrete. What are some options for connecting the wood slab to the floor? Metal dowels?

Thanks a lot and looking forward to learn.


1 reply so far

View AandCstyle's profile


3170 posts in 2429 days

#1 posted 05-16-2013 01:12 AM

Kenzaboro, you can use the Sagulator to determine the amount of sag based on the load.

Regarding connecting the horizontal and vertical pieces there are a number of options. I would probably go with dowels, but you could use the metal angle iron which could be let into the wood and would be totally hidden or pocket screws.

As for attaching the vertical piece to the floor, install 2-3 screws into the concrete with the head sticking up about an inch and drill corresponding holes into the bottom of the wood and set that over the screws. You would need to seal this well so water doesn’t create any issues over time, or leave it 1/8” above the floor. HTH

-- Art

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