Folding all seem to attach to the back of the hatch, which will be a pre-made jobby w/50mm insulation, so not suitable I don't think. Concertina could work, but all look a bit crap/flimsy, and most telescopic seem to use the space behind the hatch, which I don't have. Maybe this crap diagram will explain the layout a bit better. Fixing to the wall so it extends above floor level like a normal staircase would be ideal.
Folding all seem to attach to the back of the hatch, which will be a pre-made jobby w/50mm insulation, so not suitable I don't think. Concertina could work, but all look a bit crap/flimsy, and most telescopic seem to use the space behind the hatch, which I don't have. Maybe this crap diagram will explain the layout a bit better. Fixing to the wall so it extends above floor level like a normal staircase would be ideal.