folding stair

disappearing stair, folding stair, loft ladder

A swinging stair, usually a folding ladder, which enables passage to an attic space or loft. The stair is fixed to a trapdoor which, when closed, hides the stair from viewers below.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Then, while watching rescue crews breaking through attic roofs with axes to look for residents trapped under the roofs of homes that were nearly completely submerged, I couldn't help thinking that if New Orleans were to be rebuilt, an attic hatch, folding stair, and roof window might become mandatory for any home built below sea level.
Its core products include gantry systems, folding stairs and safety cages to access the top of tanks.