ChaosMom
Crowing
Oh thanks, that's very helpful indeed! So basically junctions, of any sort of material. Nestera-type coops' advantage is that the junctions aren't permanent (as they can be quickly disassembled), so you don't have to approach Armageddon-levels of mite-killing after infestations. Good to know.Mites will find their way into a Nestera, like any other coop of course, and typically I find them hiding where sheets meet: between the covers of the circular vents and the side panel they rotate upon (I leave the covers off now, and find no mites there anymore); on the few-millimetre strip on the side wall that is covered by the ends of the 3 sides and bottom of the nest box, where it touches the main body of the coop; in the square holes where the roosts sit; on the back door where it covers the back wall; on a narrow band round the nest box roof where it sits on the side walls of the nest box; and occasionally on the underside of the poop trays. The last four are easily exposed, but where the nestbox meets the main body requires a little disassembly to get at, so whatever you do, when you add on, keep in mind that you will be wanting to take it apart periodically for a thorough wash, and make your fixings accordingly. You will find small round holes already drilled through the plastic walls for attaching a run, so I assume they are well placed for easy disassembly, but I haven't had occasion to try them out. Ditto hardware cloth, so can't advise on that either.
If you have a jet washer, that works well to dislodge mites and eggs even without partial or total disassembly, though my coops are normally located too far from taps and power for that, so I remove the nest boxes to expose their edges and hand wash with hot soapy water and a plastic scourer. Usually that's enough to remove them. And the whole job takes about half and hour once you've learned by heart how to disassemble and reassemble the nest boxAnd no nasty chemicals or dusts needed
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And I hadn't even thought about the underside of poop trays!

So where do red mites (and others) come from, if the run is on land where poultry hasn't been, at least since the 1940's, and the flock is brand new and clean? The top of the run is hardware cloth, and we do have songbirds, crows, and hawks in the area. Are they a source for mites?
I might not be focussing on all this quite so hard if it weren't for the fact that the girls are still determined not to be caught, apparently seeing me with a chainsaw and hockey mask. It's hard inspecting them if you can't catch them.
- and wow, I hadn't thought about the vent covers AT ALL! I'll take them off and park them in the shed for a rainy day.