The blades cut open the metal wall of the barracks, the roof sagged.

The porch was badly damaged by the blast, and the roof sagged toward the middle.

The roof is sagging badly, and scarred from fire.

The roof sagged in the middle, then the whole building shifted to the left.

The plank walls of the house were water-stained, and the roof sagged.

The roof sagged in the center; the front door was off its hinges.

When next she awoke, the light had dimmed, and the roof sagged, heavy with snow.

The roof had given under the blow, and sagged in.

As the workers were pulled back, the roof was already sagging in the center.

The roof sagged, the air white with rock dust.