No, it doesn't, which is interesting. 95% falls down between the roost bars onto the tray below. Goopy poops sometimes will leave something on the side of a bar. The bars have a non-stick quality/texture to them and are easy to scrape, wipe or clean. If someone poops against or close to a wall those poops will sit on top because there's a bit of shelf. Usually I find one or two like that. Once in a while the top surface will be poopy if someone steps in a poop and then shifts or walks around in there.It is an interesting roost design. A cross between a flat shelf and roosting bars. Does it get very poopy at night?
When they were 6-7-week old chicks I removed the roost bars and moved them in there with a puppy pad and deep wood chips covering tray to bring it up to door height, and the (press 'n seal wrapped) heating pad set on low on one end they could sit on if they needed it (they did love that on cold September nights). Then when they were bigger pullets and big enough to deal with the bars there was a fairly short period where there were poops all over the bars. Their butts not lining up right? Roosting differently, finding where is most comfortable to grip, or finding their favorite spots? Some people have removed the bars and set up regular roost bars over the tray, from their stories I think they haven't waited through that poopy pullet stage to see if it was going to last.
I can't tell yet how the bars are for their keel. Maybe the deepest part of the curve sets in a space? That would distribute weight on two points. I don't see any problems there yet. There is more than one thread on BYC on the ideal roost bar width and shape! I've read through at least two.