Why do all flights of stairs have 13 steps

Wall height is 8 feet.
When cutting the stringers for a staircase, there are codes that must be followed.
Here, it is a rise of no more than 7.75 per step.

The variable between the rise of the first step and the last can be no more than 3/8 inch.
Usually the general rule is 7.5 rise by 10 inch run.
Depends on the floor finish.

Do the math.

Damn beat me to it...Nothing to see here move along

It are gees planes .. But eh its terrible.

Specialy when they cant let go to have it like that for ever.

For bad luck so as many people fall down them. It's a conspiracy I tells ya.

Coincidence.

Its the illuminati!!!!

......erm sorry i couldnt resist.

...ok move along.

That means that the overview owner is sick and must be disposed.

There are exceptions..
Such as the builder excavating and pouring slab for a half-basement to 11 feet instead of 10.
Then demanding a landing and a turn in the wrong place...

Grrr.

13, is a sacred number, we have been lied into beleiving it is an evil bad number.

What the hell is wrong with you? This is GLP, you are not suppose to post logical factual answers! jeez. Panic killer!

Mine has 17. But I don't have 8 ft ceiling, it's higher but I don't know the height.

coincidence

my OCD can confirm this coincidence, since it doesn't happen to me.

11 to basement
15 to second floor
13 to attic

It averages at 13, though.

They all don't have thirteen steps.
Fail

you count stairs too and find they are not built in sets of 13? I dont believe you. the below poster proves they are in sets of 13.




There is the esoteric and the exoteric and the freemasons are the master builders who use stairways as an important part of their traditions and rituals. rather than saying there was a conspiracy I was merely highlighting the link.
I have no issue with the number 13 either.

so why is the wall 8ft and the rise no more than 7.75? why not 8.5ft and 7.5 rise?

Gotta have a standard to build with.
You could use any size of anything but the different materials must match dimensions, ultimately.

The rise and run have to do with ease of climbing and balance.
The 1.5 inch overhang on treads is also for balance.

13 is merely a number.
One more than twelve.. one less than 14.

The 7/10 rise/run standard for humans is uncomfortable for reptilians...

If you get chased by one, find and run up a flight of stairs and you will lose him in the dust.

Kind the opposite of running from a bear.
Run downhill from a bear.. he has no brakes going downhill. At the last moment.. dodge sideways and the bear will keep going till he hits the bottom..

By then you can distance yourself from the bear
or from your slower friends, at least.

Hope this helps..

Dude, get over it, it all depends on the distance from one floor to the next. 8' is average height, with a standard set for treadway. Because it works out to average of 13 steps is not a fucking conspiracy. Goddamn!

>implying all stairs have 13 steps

what about ladders?

yes, well, what happens with 10 foot ceilings? they are common in the old buildings in my city.

my own house has 15 steps to the upstairs and ten to the basement.

so, don't believe me if you want to. that just proves that you have trouble getting past your own OCD to see much logic. i'm sorry for that. i hope it works out for you.