D.C. Mun. Regs. tit. 22, r. 22-B3242
Walls and floors shall be designed and maintained to minimize the incidence of accidents.
Walls shall be made of materials that will permit frequent washing.
The finish in areas exposed to water, high humidity, or grease shall be moisture-proof or grease-proof, or both.
Floors shall be easily cleaned, and either carpeted or of non-slip surface.
Floor materials shall be mounted flush with adjacent materials to provide unbroken surfaces facilitating wheelchair use.
Door threshold and expansion joint covers shall be flush with the floor.
The ceiling of each unheated room or of each room where there is high heat generation, such as boiler or laundry room, kitchen, and similar room, shall be insulated to prevent heat loss or transfer when the floor directly above is used by residents.
Floors on grade or above air spaces shall be insulated to prevent heat loss.
Each facility shall use lead-free paint inside the facility and shall remove or cover old paint or plaster containing lead so that it shall not be accessible to residents.
D.C. Mun. Regs. tit. 22, r. 22-B3242