Staircase
Layout
The first thing you need
is the layout of the staircase, this is governed by your sizes and
the rules set out in Building Regulations document K.
Are you going to design
the stair layout yourself ? Do you have drawings prepared by your
Architect? Is the staircase a Replacement Staircase?
Designing the Staircase
Layout
The first thing I do when
sorting out a new staircase is to measure the rise, the rise is
the measurement from finished floor to finished floor level. ( Floor
to Floor)
Once you have established
the rise the next step is to establish the number of risers required
for this particular staircase, for a domestic staircase you need
a rise between 190 and 220mm to stay within building regulations.
The height of a riser on a standard staircase is 200mm you should
be looking to get as close to this as possible.(Eg :- 2600mm Rise
(floor to floor) divided by 13 would equal 200mm, equaling 13Nº
risers.)Or just let Stairplan know the floor to floor measurement
on your enquiry.
Now you have the number
of risers required you now also know the number of treads required,
you require 1Nº less tread than the number of risers. (Eg :-
13Nº risers 12Nº treads.)(The top tread is only a nosing
that attaches to the Trimmer Joist at the top of the staircase.)
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 42º. Use the chart on the
Rise and Go page to help you identify the correct Going size to
suit your riser height. (Eg:- for a riser height of 200mm a going
of 223mm should be chosen.)
Width - there is no restriction with how narrow you can go with
a staircase but the width of a standard flight of stairs is 860mm,
For a main staircase I would suggest trying to maintain a width
between 800mm and 900mm and I would not recommend a width of less
than 600mm for a loft conversion.
Will a Straight flight fit?
Well you have the going size of each tread now and the number of
treads required so you will have a total going length for the staircase,
on top of this total going length you will need to add on the thickness
of the top riser and the depth of the Nosing used in the construction
of the staircase.(Our standard nosing size is 20mm, the standard
riser thickness is 9mm making the add on 29mm, we suggest you use
30mm). The room you need at the top and the bottom need to be at
least the width of the staircase, if you have a door opening in
to the space at the bottom of the staircase you need to be 400mm
away from the door when it is open, at the top you don't want any
doors opening into this space at the top of the staircase, for more
information on this look at the relevant pages in the Building Regulations.
A Straight Flight Wont Fit?
Corners - When it comes to corners you have a number of options
the simplest option is a 90º quarter turn landing for this
you only need to allow the width of the staircase, the next option
is a 3Nº tread kite winder for this you need to allow approximately
900 x 900mm for a standard width staircase (860mm) in the corner,
depending on your going and the width of your staircase the size
of a 3Nº tread winder changes, a good guide for the minimum
size is 750 x 750mm for a 600mm wide staircase, the next option
is a 4º tread winder for this you need to allow approximately
1000 x 1000mm on a standard 860mm wide staircase, again depending
on your going and the width of the staircase this size will change.
Headroom
You need a minimum of 2000mm of clear headroom above the pitch line
on a domestic staircase to comply with building regulations (there
is a slight relaxation on this for loft conversions look at the
appropriate page in the building regulations).A typical size for
your Stairwell is to have it the same size as the staircase layout,
usually you wouldn't get away with a staircase being more than half
a tread under the stairwell on a typical standard rise height staircase.
Take care when your planning on where to put your staircase especially
when your going into your loft and make sure you stair well opening
is big enough.
Don't always rely on your architects drawings sort your stairs out
while it is still possible to alter your stairwell as it could get
expensive to alter it later.
If your staircase is going to go over your exiting set of stairs
think about the headroom on the flight below also.
If you are trying to plan a staircase to go up into your loft a
good place to start is in the loft this is because you are usually
limited to where you can exit the staircase in the loft space due
to the head room in the loft space.
We have a number of staircase layout drawings online you may find
it easier to find the closest one of these to what you require,
these drawings have detailed measurements as well as a 3d view to
help you see what the staircase is going to look like.
Does your staircase need to comply with regulations or not?
If you are replacing your
existing staircase and the current one doesn't conform with current
building regulations then your new staircase can be as existing
or better than the existing staircase.
Now you have got a rough
idea of the layout design of your staircase. |