|
After some very careful planning and design, we proposed that the Supreme stairway should be used. The top of the special “L” shaped hatchbox would be fitted into the ceiling opening with the remainder sitting under the slab. The depth of the hatchbox needed to be 900 mm to allow both for the slab depth, and the fact that the ladder would itself require at least 600 mm of vertical space when not in use. Fixed additional treads were ready fitted into the hatchbox to cover the distance from the top tread of the ladder up to the floor level in the plant room.
The client then fixed a suspended ceiling at 4100 mm to finish flush with the trapdoor level.
A pleasing answer to a difficult question!
|