1067mm diameter can have 1 extra victoria or plain baluster.
Spiral staircase regulations.
It is important to note that where there is a contradiction between bs 5395 part ii and part b and m of the building regulations part b and m take precedence.
Spiral stairs must meet the vertical clearance requirements in paragraph d 3 of this section.
Spiral stairways shall meet the following requirements.
The document governing spiral staircase building regulations in the uk is british standard 5395 part 2.
All building regulation spirals must comply with the 100mm sphere rule i e there must be no gaps greater than 99mm anywhere on the spiral staircase.
The usable surface of the stair tread must be a minimum of 26 inches in width measuring from the center of the staircase to the outer handrail.
Spiral or helical staircase regulations part k of the building regulations provides the guidelines for ensuring occupants or visitors to a house are protected against falling collision or impact.
Spiral staircase regulations for commercial and public use category c small semi public d semi public or e public stairs tend to be for staircase projects in commercial and public spaces.
The clear walking path on a particular staircase.
This document is summarised in the table below with categories given for each spiral application and the relevant maximum riser heights and minimum widths.
Vertical clearance above any stair tread to any overhead obstruction is at least 6 feet 8 inches 203 cm as measured from the leading edge of the tread.
Spiral staircase code overview.
These specifications show standard stair dimensions for height tread degree rotation degree and many more details for each.
In situations where space is limited the diameter is at the discretion of the building inspector.
The rules within part k don t apply to spiral or helical staircase designs.
So if the client is ordering a scandinavian parisienne or a victoria 1067 or 1194mm it must have riser bars.
1910 25 b 3 stairs have uniform riser heights and tread depths between landings.