Open Riser Timber Stairs ~ these are timber stairs constructed to
the same basic principles as standard timber stairs excluding the
use of a riser. They have no real advantage over traditional stairs
except for the generally accepted aesthetic appeal of elegance.
Like the traditional timber stairs they must comply with the
minimum requirements set out in Part K of the Building Regulations.
Typical Requirements for Stairs in a Small Residential Building ~
upper floor landing
wall string hooked over
landing trimmer
minimum going
220 mm
pitch
line
outer string
floor level
rise ... 220 mm max.
treads housed
into strings
minimum
overlap
16 mm
maximum pitch 42ƒ
Recommended clear width for
all stairs is 800mm minimum,
but 900 mm wall to wall or
wall to centre of handrail
is preferable. Clear width is defined in BS 585-1
as "unobstructed width between handrail and
face of newel", but see also page 686. A
reduced clear width of 600mm is acceptable
for access to limited use space such as a loft.
Aggregate of going plus
twice the rise to be 550 mm
minimum and 700mm maximum
no opening which will allow
a 100 mm diameter sphere
to pass through ... see
details on following page
no opening which will
allow a 100 mm diameter
sphere to pass through
handrail
balusters
newel
post
minimum headroom 2.000
900
mm min.
1000
mm max.
Timber Open Riser Stairs