Tree Stairs Back to Handrails The client asked for a staircase which looked like a tree growing out of the living room floor. . . The trunks are made of textured steel plate. The branches are made of textured steel pipe and solid rounds. The stair treads will be covered with wood flooring. The handrails will be formed from laminated wood. The "hollow tree" hole allows access to bolt the staircase in place.