Minimum tread depth

[Arthur 51]

Hi all. What is the minimum tread depth for stairs in domestic environment?

Thanks.

Arthur

[Arthur 51]

Sorry gents...half a sleep. Just googled and found it...9" nost to nose and rise is 8"

[The Natural Philosopher]

But only in the tread center..check on spiral type staircases if you want to cram a staircase into a small area.

[John Rumm]

Its not quite that simple since the allowable values are interrelated with the rise as well, have a look at approved document K (page 6)

[Dave]

content. :-)

Dave