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Working out your stair measurements.
Floor To Floor
Height
The first thing to
do when planning out a new staircase is to measure the total
rise, this is the measurement from finished
floor to finished floor level. ( Floor to Floor height)
Floor To
ceiling Height
This
measurement is from the floor the stair starts at to the
under side of your ceiling on the same floor of the property.
Ceiling
Thickness
To get this
measurement take away your floor to floor height. from your
floor to ceiling height
Stair Rise
Once you have
established your rise the next step is to work out the
number of risers required, for a domestic staircase the
individual step rise must be no more than 220mm to stay
within building regulations (Part K). The height of a riser
on a standard staircase is 200mm so ideally you should be
looking to get as close to this as possible. (for example
2600mm Total Rise (floor to floor) divided by 13 would equal
200mm, equalling 13N� risers.)
Treads Required
Now you have
the number of risers required you now also know the number
of treads required, you require 1N� less
tread than the number of risers. Example 13N� risers 12N�
treads. The top tread is usually your floor of the next
level or the landing of a spiral staircase.
Tread Size
The next thing
you have to do is work out the tread size required otherwise
known as the going, the going is the
measurement from the face of one riser to the face of the
next riser. The minimum going for a domestic staircase to
comply with building regulations is 220mm and the pitch of a
domestic staircase must not exceed 42�.
(Example: for a riser height of 200mm a going of 223mm
should be chosen.
Stair Width or Diameter
There is no restriction with how narrow you can go with the
width of a staircase but the width of a standard flight of
stairs is
860mm, For a main staircase we would suggest trying to
maintain a width between 800mm and 900mm and I would not
recommend a width of less than 600mm. For spiral staircases
you will need to know the diameter this is the opening
width, for example if your stair opening is 1400mm x 1800mm
we take the smallest measurement as the maximum stair
diameter you can have, making your diameter 1400mm however
you need to deduct 100 mm from this measurement making the
diameter 1300mm this allows a 50mm gap each side to stop you catching
your knuckles where the handrail passes through the opening.
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