That's a really interesting idea for path blocks.Hmmm... food for thought, I suppose.
I have used office paper from my job (I go thru and remove the staples, clips & paperclips. Have 11 cases of forms from a clean out of paperwork that had already been scanned), phone books (yep, they still print those), junk mail (I remove the plastic) and all other house paperwork, as we've not needed it, for years.
I have a good paper shredder that works well. It will even shred all the Amazon boxes we get at this time of year. I've used the shredded paper & cardboard directly in our compost, in the coops/runs and in my brooders. I haven't used it in the nest boxes - that's next, LOL. The chickens will compost it nicely, when using DLM, it just disappears into the litter. I've not noticed any issues with it. It can get a bit "fly-a-way", but the coops i've used it in are in our pony pastures on sand, so I've never been too worried about it. This winter, I will be using it in combination with leaves, yard debris and pine straw in the coops behind the house and would be happy to let you know how it does...
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A friend brought a bunch she'd already shredded over. It was double shredded - very fine and tiny. it's kind of neat! That, I would think, won't be used for the chicks. Very different from the shred from our shredder.
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Over Christmas, my granddaughters and I are going to try our hand (s) at making concrete blocks. They will be made with 1/2 Quikrete, 1/2 shredded paper and water. They will be set up in the card board boxes I bring home from work (high volume spay/neuter clinic) - different sizes and all boxes I've chosen so far are marked to make the "blocks" 2.5" thick. I have a path from the drive way to the house that's about 4' wide and about 80' long (haven't measured it, might be a bit wider and it could be either longer or slightly shorter). If these work, it will take a lot of boxes and shredded paper to make the whole walk-way. But it will be another use for the cardboard boxes and for the shredded paper. (some references - Papercrete in the garden, Kid friendly stepping stones, Stepping stones. ) I planned on mixing the shredded paper with quickrete instead of Portland cement... A family activity that will get me a not too expensive concrete stepping stone path, I hope!
Who knows - we may build forms and then make papercrete foundations for our hoop coops so that we can do a DLM and not have lumber bottom bases rot away - what a way to use resources we already have access to. I was even thinking of trying to use some round foil pans we'd gotten take-out in. Then putting a hole thru the center and will see if it will work for "stone" wheels for chickie tractors! We shall see...
I would love to hear from you how it turns out once you get the pavers done!