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MDO plywood is an excellent choice for outdoor sheet goods as long as you seal the edges and paint it. Lots of outdoor signs are made with it. I've used it for porch columns and they have held up great so far, about 9 years now. For the frame and doors, white pine would work well if painted, as would cedar, cypress, white oak, Spanish cedar, and of course mahogany and its relatives. Spanish cedar is a pleasure to work with, but it's not cheap.
John
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I built one that was used indoors at the local Starbucks. It was a very popular option before the pandemic. Much less so since.
I was amazed how much abuse it suffered at the hands of both the customers and the staff (the staff damage was primarily due to sloppy mopping techniques).
You cannot overbuild this. The stronger and more weather resistant it is, the better.
I might even consider plastic decking materials.
You might call a local deck builder and ask if he has off-cuts that you can use for this purpose. It is likely that pieces less than 3 feet long get tossed in the garbage.
I would hope they would donate the off-cuts for free.
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Location: Chesterton Indiana
Cypress, White Oak, Locust would all be good frame material. I'm getting ready to build two outdoor Adirondack chairs and use White Oak.
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I built one for our church about three years ago. It is outside, under a breezeway. I used ceader, board and batton. Recently I noticed one board has checked.
"I tried being reasonable..........I didn't like it." Clint Eastwood
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IPE would be great. It's used for decks and boat docks. It's called iron-wood for a reason. Has an expected life of over 25 years outdoors. You should be able to buy beg borrow some cut offs from a local deck builder.
Telling a man he has too many tools,
is like telling a woman she has too many shoes.
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Thanks, everyone. I am looking for someone who has MDO in stock, and can cut it to fit in my SUV. Menards near me supposedly has a couple of sheets. Some stuff is still pretty scarse though, or really bad imported crap.
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I just wanted to thank all who responded to my question about the outdoor library project. I found MDO plywood at a local hardwood store and they cut it into the four panels that fit into my car. As it turns out, I will be able to get two good sized libraries out of the full plywood sheet. The first one is almost done. I am using white oak for the windowed door, since it does pretty well in weather. I'll post a photo when the library is installed in the spring. Looks like I will be building another one for my daughter's neighborhood.