Stairs with sheet-metal sandwich cap built into the ceiling. Cap contains thermal and a flame-resistant insulation. The gap between the cap and frame is sealed with a flame-resistant foam strip. On the frame structure, a folding ladder is fastened to the cap. The whole stair space is closed from above by a thermally insulated cap. From the visible side, the lower cap is painted white and covered with protective film; the wooden parts of the upper cap are protected with a fungicidal solution, and the plywood used is water resistant.