Specification

1. Opening Size
Measure the rough opening in your ceiling, both the width and length.
Standard openings are 22.5” x 54”, but some homes have wider openings.
Conversely, some homes have smaller openings (or hatches). It’s important to
understand the opening size you have or will create to ensure you select the
correct attic ladder product for your home.
2. Floor to Ceiling Height
Measure and verify the ceiling height, which is the
distance from the nished oor to the nished ceiling.
Most attic ladders cover a range of ceiling heights, so
it’s important to know the exact measurement you’re
working with. For smaller attic ladder openings with a
minimum measurement of 18” x 24” you will need to
measure from the nished oor to the attic oor.
3. Swing Clearance
Measure and verify the amount of space available
to swing out the stair sections of your ladder (this
extends beyond your attic opening). For smaller
attic openings with a minimum measurement of
18” x 24” you will need to measure the swing
clearance inside the attic space. The compact attic
ladder requires a minimum height of 28” and
minimum depth of 44” inside the attic, above and
behind the opening.
4. Landing Space
Having the correct amount of landing space is key
to being able to properly extend the stairs for safe climbing.
Measure the space available where the ladder will land,
from the back of the opening towards the front.
GM6881 ©2011 Werner Co. 12/11
Compact- Measure
from attic oor
Attic Ladders
Know Your Dimensions
Standard- Measure
from nished ceiling
Standard
Compact