US
Preparation (Figure A)
-
Choose the required floor plan – see page 5.
-
Alternate the wide dimensions on succesive treads of straight runs and less than 20° angles.
-
If the angle of two successive steps is greater than 20
face outward – see Figure A2 and A3, page 5.
Before installation
IMPORTANT
Before starting installation, calculate the exact rise height of each step of the staircase. This is
done by measuring the distance from the lower floor to the upstairs floor measuring vertically
along the wall and then dividing by the number of rises. The number of rises is the same as the
number stair treads plus 1. The plus 1 is to consider distance of the last step of the staircase to
the upstairs floor.
S =
(page 5)
Example: Top edge of floor to top edge of next floor: 102", 12 rises (11 steps + 1).
102" divided by 12 = 8 ½". This is the rise height per step.
The opening in the ceiling should not be less than 51 ¼" for straight flights of steps.
This is to ensure that walking up the steps is a comfortable experience.
Recommended rise height: 7
Maximum rise height: 7
Installation Guidelines
/
" to 8
/
"
5
1
16
16
/
" to 8
/
"
5
1
16
16
o
, the wider dimension of the treads are to
Y
X
4
