Just finished building my new woodshed out of pallets today.
I work for a solar company and some of the solar panels we get are shipped on super strong pallets. They have 2X4s for the skids and instead of 1X slats going across, they have 2X6s.
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Took a while getting the bases level, but once that was done it went together pretty fast. I had brought home enough of those pallets that I had enough to dismantle the ones that were less than perfect and I used the 2X6s from those ones to make a floor running horizontally because the spacing of the 2X6s on the pallets is wide enough that some of my splits could fall through without horizontal flooring.
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Once I had the floor down, I stood more pallets upright to make 4 bins, then put another pallet on top of each section for the roof to go on.
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I used the 2X4s from the pallets I took apart as cross braces for lateral stability. I also had enough 2X4s and 2X6s from dismantled pallets that I stacked a couple layers on top of the front side on top to give the roof about 10° of pitch toward the back. I still had some of the old metal roofing panels leftover from when I replaced my garage roof a few years ago so I used those old panels for a roof after sealing up the old holes in them.
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Here's the finished product:
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Only thing I had to buy was some screws.