Raised Bed Construction Lessons Learned
The first raised beds I ever built are now about 8 years old. I had some wood 4X8 foot fence panels that I cut in half and made a few 4X8 foot raised beds, about two feet high. For the most part, they are still in service, but this spring they are really showing their age and starting to fall apart.
When new, the full panels looked something like this...
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I cut them in half lengthwise at two feet high, then made the raised beds 4X8 feet. When brand new built, they looked pretty good, IMHO. But time is hard on wood and here are some lessons I learned after a number of years.
First lesson, I had the 2X4 framing in the inside of the raised bed. As you can see, I have a few corners blowing out from the outward pressure of the soil in the raised beds...
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Here is another angle closeup on that corner. I think I can fix it, but the problem, IMHO, was initially having the 2X4 framing on the inside...
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Another problem I noticed after only a year or two, was the 8 foot long sides started to bow out. I should have add additional support braces at the 4 foot point to prevent that bowing...
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In order to fix that, I would have to basically empty the entire raised bed, install the cross braces, and refill. Too much work for me especially since I am in the process of moving my garden location. I don't have anything planted in them right now, and maybe not at all this year. As long as the bed holds together, I can live with the sidewalls bowing out. But I think I could have made it better from the start and prevented that bowing.
One other problem I have had with this design is that I have had a few sidewall boards blow out and needed to be replaced. Again, I think this is due to the framing on the inside of the bed and the weight of the heavy wet soil pushes out on the boards. Eventually, some of those boards come loose and just blow off the framing. I have already replaced those boards and do not have a picture of sidewall blowout.
Of course, I built those fence panel raised beds long before I got into pallet projects. Now, I have "corrected" those problems I have seen in my first raised beds in the design and build of my pallet wood raised beds v2.0.
Namely, the 2X4 framing is now on the outside of the raised bed which should add more strength to the bed and prevent those corners from blowing out. Additionally, each corner in my pallet wood raised beds also has two 2X4 posts in each corner that the main frame gets screwed into. It's really a solid built that I expect will last much longer.
The sidewall planks are now on the inside of the 2X4 frame, so the weight of the soil pushes the side boards into the 2X4 frame on the outside. I should never see any sidewall planks blowing out.
Also, with the pallet wood raised beds limited to 4X4 foot, I should never have a problem with the long sidewall bowing out like I saw in the 8-foot-long raised beds. It just makes sense to build a pallet wood raised bed at 4 feet because the 2X4 stretchers are 4 feet long. You don't have to cut any boards that way. But I really prefer the 4X4 foot smaller size because I just find it easier to work around.
Picture of my Pallet Wood Raised Bed v2.0 design...
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Well, that pallet wood raised bed v2.0 design addresses the faults I had in my earlier fence panel raised bed projects. All those benefits, plus, the pallet wood raised beds cost me less than $2.00 each to build. The wood is free, of course, but I use new screws and brad nails to complete the project faster.