Spiral staircase size

I would like to install a (metal) spiral staircase inside my cabin. The stair will be between the main room (16' x 24') and the mezzanine (16' x 12') I did find a company that has many spiral staircase kits sizes to sell (www.theironshop.com). I would like to know which size is better to choose to be acceptable for adults and my dog (cocker spaniel) I would choose the 4'6" diameter (clear walk space between pole and rail is 2'0"). Is that OK? What is most important: the clear walk space between pole and rail or the ramp angle? Any suggestions?
Thank you, Chris
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none are very comfortable to walk on, unless your inside diameter gets up to a couple feet. your dog may not like it at all
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Sporal staircases are very pretty but if you'd like a bed up there, you will have to hoist it over the wall. They do not move easily up them nor do backboards move down them carrying a patient. Just considerations you need to be aware of.
Betsy
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Any spiral stair that's less than 5' across is going to be a pain in the ass to use on a regular basis. The important dimension is actually the distance from the outside edge of the tread to wherever the tread narrows to less than 7". Because a tread less than 7" deep is more dangerous than no tread at all.
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My dog loved the spiral staircase we had in a condo. He found that if he got about 1/2 way up, he could see all sorts of good things (Lhasa Apso/Shih Tzu mix -- serious watchdog). I did find that it was useful to invest in TWO vacuum cleaners - one up, one down, to avoid carrying junk up and down the spiral staircase. As to beds, furniture, etc., there was a railing that I could remove to lift the beds, furniture to the second floor. A great space saver, and looked nice. I had about 1-2" clearance between the rail of the staircase and the wall, so painting behind the rail was a bit of a PITA. Some dogs don't like to see open space under their feet. I never had trouble with my dogs (also a Golden), but my son's dog didn't care for the spiral staircase, or stairs in general. Your milage will vary..
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