How to Guide

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Page 3
Well Opening
Some of our customers choose to install our DIY-friendly spiral staircases
through a hole, or well opening, in the upper floor. If this is the case, you
will need to know the size of your well opening, or the opening for your
round staircase. The size of your finished well opening needs to be at least
two inches larger than the stair’s diameter. This is because your stair
needs to fit comfortably through the hole so that your fingers do not get
pinched as your hand glides along the handrail as you ascend and descend
the stair.
Whether you decide on a square or round well opening, the measurement
will be the same. Please keep in mind that the smallest well opening we
can work with is 44” x 44”; this is because the smallest stair diameter that we offer is 3 feet 6 inches (which
is 42” x 42”). If you have a well opening smaller than 44” x 44” our consultative designers will work with
you to find the best solution for your spiral staircase.
Well Opening Requirements
Stair Diameter
Opening
3’6” (42” x 42”)
44” x 44”
4’0” (48” x 48”)
50” x 50”
4’6” (54” x 54”)
56” x 56”
5’0” (60” x 60”)
62” x 62”
5’6” (66” x 66”)
68” x 68”
6’0” (72” x 72”)
74” x 74”
Floor to Floor Measurements
Tread Count
Height Min
Height Max
9
85"
95"
10
93.5"
104.5"
11
102"
114"
12
110.5"
123.5"
13
119"
133"
14
127.5"
142.5"
15
136"
152"