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Yup a cold joint is where the two slabs meet. I still stick with digging footers. Heck you can do that yourself.... The only reason I see to do this is from your pictures I can see that there is a gravel base, That base around te edges might end up washing out over time. If that would happen you could end up with the slab breaking off. I doubt that would be the case but would hate to tel you it'll be fine then have it happen.
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