Door threshold is used in water return system, which comprises a lower and upper sill, rear wall, and front wall forming a chamber. It provides a weather barrier to sound, air and fire.

Elevator door sills are used in elevator systems that have sliding doors. The door sill comprises a sill plate and a support sill located below the sill plate. It also comprises a first guiding surface that engages that inboard sliding surface and a second guiding surface that engages the outboard sliding surface. It prevents the elevator door from swinging when the door slides opened and closed. It is used in elevator car doors. It is installed from a hallway without the use of a moving elevator platform. An elevator door sill is provided for mounting at the elevator entrance adjacent to the elevator shaft.

Exterior Stairs/Stairways are generally built less steep. The treads need to be deeper and risers shallower outdoors to make the stairs safer when wet or covered with snow or ice. Heavy timber or pressure-treated wood is often chosen for a wood stair out of doors. Ground-supported steps follow the contours of sloping sites to provide easy access to porches or entrances or as connections between terraces and landscape elements. Stairways can be straight, round, or may consist of two or more straight pieces connected at angles. Special stairways include escalators and ladders. Alternatives to stairways are elevators and inclined moving sidewalks.

FRP ladders are ideal for board ships and storm water. It is made of pultruded FRP profiles, which consist of corrosion-resistant, anti-aging and fire-resistant. It is available in different types such as leaning and extendable ladder, trestle ladder, single ladder with cap, extension ladder, straight ladder and household ladder.