E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
E04F11/02—Stairways; Layouts thereof
E04F11/022—Stairways; Layouts thereof characterised by the supporting structure
E04F11/025—Stairways having stringers
E—FIXED CONSTRUCTIONS
E04—BUILDING
E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
E04F11/02—Stairways; Layouts thereof
E04F11/104—Treads
E04F11/116—Treads of stone, concrete or like material or with an upper layer of stone or stone like material, e.g. ceramics, concrete; of glass or with an upper layer of glass