Article 3.9.1 of code for design of residential buildings gb50096-1999

3.9.1 when the height of the external window sill from the floor and the ground is less than 0.90M, protective facilities shall be provided. This restriction may not apply if there is a balcony or platform outside the window. The clear height of the windowsill or the height of the protective railing shall be calculated from the tread to ensure a clear height of 0.90M.

Regulations on protective measures and protective height:

Article 10.5.3 and 10.5.4 of national technical measures for civil building engineering design / Architecture

10.5.3 for windowsills lower than the specified requirements (hereinafter referred to as low windowsills), guardrails or fixed windows equivalent to the height of handrails shall be set at the lower part of the windows as protective measures. As a protective measure, the fixed window shall adopt laminated glass, and its thickness shall not be less than 6.38mm (see this note). The glass frame must be embedded with sufficient strength to meet certain impact requirements.

Note: the thickness requirements of this glass are derived from the provisions of articles 5.2.2.1 and 5.2.4.1 of technical specification for application of building glass jgj113-97 on glass for handrails. The glass equivalent to the handrail shall be framed glass, that is, there are window frames around the glass, and the height of the fixed window shall not be greater than 0.9m. At this time, the horizontal load of the railing is borne by the rung of the fixed window, and the glass itself is only used for maintenance. The use of laminated glass can prevent the glass from falling off the frame in case of accidental breakage.

10.5.4 the height of protective measures for low windowsill shall not be less than 0.8m (residential buildings shall not be less than 0.9m).

1 the protective height of low windowsill shall comply with the following provisions:

1) When the height of low windowsill is less than 0.5m, the height of guardrail or fixed window shall be calculated from the window top;

2) When the height of low windowsill is higher than 0.5m, the height of guardrail or fixed window can be calculated from the ground. However, no horizontal fence or any other treadable part shall be set within the height range of 0.5m below the guardrail. If there is a treadable part, its height shall be calculated from the treadable part;

3) When the indoor and outdoor height difference is less than or equal to 0.6m, the low windowsill on the first floor may not be provided with protective measures.

2 the protective height of low sill of bay window (bay window) shall comply with the following provisions:

1) Where a wide windowsill is set within the bay window for people to sit or place flower pots, the protective height of the guardrail or fixed window shall be calculated from the windowsill surface;

2) When there is no wide windowsill within the range of the bay window and the guardrail is set close to the inner wall of the bay window, the provisions of the low windowsill can be implemented.