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WARNING: Carry out the installation in a "workmanlike" manner, strictly following the installation instructions and using
suitable tools. Always consult your local building department for code requirements that must be respected depending
on its destination of use (private, secondary, public...).
Before starting the assembly, unpack all the pieces of the staircase. Spread them out on a spacious surface and
check the number of pieces (TAB. 1: A = Code, B = Quantity. For "B" chose the column with the code which you will
find on the label on the packing case).
Included in the kit, you will find a DVD, which you are advised to watch before beginning.
For customers in the USA there is a customer assistance number 1-888 STAIRKT which you can telephone in case
of problems.
Assembly
1. Carefully measure the height from floor to floor (H) (fig. 2).
2. Calculate the value of the riser: a) subtract 20.5 cm (height of the first riser) from the value you obtained for the
height from floor to floor (H); b) divide this value by the number of risers, less one.
Example: for a height measured from floor to floor of 263 cm and a staircase with 13 risers;
(263 – 20.5 / 13 – 1) = 20.21 cm (fig. 2).
3. Measure the ceiling aperture (C) carefully (fig. 2).
4. Calculate the tread value (P):
for the version with going width (railing included) L = 74 (fig. 2A):
a) subtract from the value found for the ceiling aperture (C) the following fixed dimensions:
1) 29 cm = final tread; 2) 69 cm = corner treads; 3) 1 cm = distance from the wall
b) divide this value by the number of treads remaining
Example: for a ceiling aperture of 231 cm and a staircase as in (fig. 2A);
231 – 29 – 69 – 1 / 6 = 22 cm
for the version with tread width (railing included) L = 89 (fig. 2B):
a) subtract from the value found for the ceiling aperture (C) the following fixed dimensions:
1) 33 cm = final tread; 2) 84 cm = corner treads; 3) 1 cm = distance from the wall.
b) Divide this value by the number of treads remaining.
Example: for a ceiling aperture of 262 cm and a staircase as in (fig. 2B);
262 – 33 – 84 – 1 / 6 = 24 cm
5. To facilitate the determination of the drilling points, you can mount the tread L25 onto the support N20 using
the screws C53, but without fixing it permanently. In this way it will be easy to mark the drilling points which
correspond with the eyelets. Drill the holes with a Ø 18 mm bit (fig. 4) (fig. 5). Fix the final support N20 to the
ceiling aperture with items C48, checking that the staircase is horizontal.
6. Assemble components N24 to supports N21 and N22 (fig. 3). Insert the screws B07, B06 and B23 but without
locking them. Insert the tubes C21 in the inside part of parts N24; the braces C22; the washers C20 with the
knurled part facing the flange and the nuts B99. Set in position the tread (P): For the rectilinear treads, the
value (P) is according to the previous calculation (see point 4). For the corner treads, the value (P) is:
20 cm (fig. 2A) for the version with the tread width (railing included) L=74
24 cm (fig. 2B) for the version with the tread width (railing included) L=89
Permanently lock screws B07, B06 and B23. Proceed with the assembly of all of the supports N21. Screw the
tube with the threaded brace N25 to the second support riser N22 as far as it will go.
7. Insert items C13 and B02 into components F29. Fix items F29 using items C57 (on the side where the railing
will be), level with the front edge of the treads L25, upside down (from the holed part), and at a distance equal
to the value of the tread previously calculated (see point 4), except for tread L25 put in place before the corner
treads. Drill with a Ø 4.5 mm bit to a depth of 30 mm (fig. 1) (fig. 7) (fig. 9).
8. Assemble tread L25 to support N20 with screws C53. Check that the tread is horizontal and permanently fix it
with items C48. Apply item D34, to cover the plate, with items B12 and C62, drilling with an Ø 8 mm bit (fig. 4)
(fig. 5).
9. Insert the intermediate support N21 into the final support N20. Make it safe at the bottom with self-locking
pliers before fixing it permanently. Assemble the tread with screws C53; prop up the supports one by one as
you proceed with the assembly of the structure and of the treads so as to make sure that the weight does not
overload the upper floor. It is essential to insert a prop every 4/5 supports and severely forbidden, for safety
reasons, to climb on the staircase before having fixed it to the pavement (point 13) and made it rigid (point 14).
Place in position the riser as previously calculated (see point 2); check that it is horizontal and aligned with the
previous tread. Permanently fix components B99 working on both sides of the support in order to avoid changing
the trim (horizontal or vertical) of the tread. Warning: check the depth of the tread of tread L25, using a baluster
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