The following shall be observed:

a. Allowing an opening in the SS wall and later erecting the SS door frame and door leaf in this opening, followed by casting concrete around it, is not permitted.

b. When casting the SS wall with SS door frame, a dummy door leaf of adequate design shall be placed to ensure the stability and prevent the bending, warping or displacement of the SS door frame during concreting.

c. The FFL of the floor slab outside the SS shall be done such that the SS door can be opened adequately for the peacetime use of the SS.