We also bought some of that orange plastic temporary fencing material they use at construction sites along the road. My criss-cross pallets are unstable to move, so I go around the pallet with that material, and apply bungies, move the pallet where I want, and remove and reuse the orange material for the next move.
It is not a good idea to cover the sides of a stack...just the top. Air should free flow through the stack from all sides, and the bottom of the stack should not touch the ground if you can avoid it. Sometimes, I use cedar logs along the bottom to keep the other wood out of the muck, dirt, and moisture. The cedar will last a long time. But any small tree can do it same thing, but just won't last as long.
small trees or cedar look like this
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gap
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then I stack the wood on like this
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My pallet pattern looks like this
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then second layer
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I try to leave about 1/2 inch between all side by side wood, so in the end, wood doesn't touch wood beside it, but does touch would above and below, but only at a point (or patch).
All odd shaped pieces are put on last to form a small dome, and the tarpaper patch will be applied over the dome. In another two weeks or so (since it is starting to heat up here, it will be time to apply my tar paper.
Here is a picture of a conventional stack..it is too close to the house for dirt, but on concrete, the termites will have difficulty finding water. It is 3-4 inches off the retaining wall. The barrel in the background is for burning some punky wood my brother wanted to get rid of. Some of that wood had termites too, and I need to get it burned pretty quick, thus the barrel. I put strips under the treated boards, and angled the strips. This pile will be the first burned this winter, since it is quite old. It also came from my brother, but was on a pallet wrapped with woven wire fence. It sat outdoors uncovered for several years, and was packed quite tightly on the pallet. Now, I do my own wood, so the wood for winter after next will be fresh dry red oak, that me and my buddy cut to 15" lengths and split with our new splitter we share.