Jonathan- A little more info about the situation... I have some minor woodworking and construction experience, so I think I can handle most bench structures given the proper planning. Budget is not a big concern, only because I just need one or two benches. I would really like to use some reclaimed wood, but that can be tough to find. Cypress is common around here, as well as cedar and of course pine. Teak and mahogany are too nice to use for entire structure. I could maybe use a more expensive/exotic wood for the facade? I have about two dozen small trees. I do grow mostly from seed so I will probably have a different area for propagation, separate from this project.
Definitely no concrete cinder blocks or super modern looking designs. I have some old bricks I may try to incorporate.
I would definitely like to integrate an irrigation system. There is one obstacle, I would like the benches to be portable so I can bring them with me when I move.
3 things will kill your benches...sun, water then termites.
Ed's right: Engineered products are the longest lasting, not necessarily the prettiest. I've used it on decks (including my own) for over 15 years.
I'd use pressure treated for the structure.
Anything in the Mahogany family: Ipe, Mangaris etc. for the finish.
Use stainless steel deck screws. For the big stuff try "timberlock" lags. Long and strong.
Jeremy has some nice looking benches (moveable) and Brian (Van Fleet) also has some good points on design.
Railroad ties are long lasting but too big, heavy and difficult to cut in this type of application.
If you"re worried about termites, spray with orange oil once a year.
If you use cedar or cypress (local stuff)...make sure it's over 1" thick...longer lasting.
Here are some pics of a couple of my designs.
Note the base on the dining table as an idea for a base on portable benches. Easy to do with 4x6 material...sturdy.
The bench on the deck is moveable.
I came up with an idea to attach a "shelves" to an existing fence...
Monkey posts are great...I made one I can move around
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I'm showing you these, as many have, merely for ideas...the more pictures you see the better!
Again,
Good luck