| 11. | They were made of stone, usually without mortar, with flat roof slabs resting on corbelled, or layered, walls.
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| 12. | Its roof slab is about thick.
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| 13. | The first of Costello's reusable designs is the pillbox with double-cantilevered roof slab, or " park " type shelter.
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| 14. | The thick roof slab is designed bear the load of both the station box, and the soil above it.
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| 15. | The collapse of the ceiling structure began with the simultaneous anchors embedded in epoxy in the tunnel's roof slab.
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| 16. | Floors are lined with linoleum and a system of suspended ceiling panels conceals the underside of the concrete roof slab.
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| 17. | The earliest preserved ancient Egyptian temples, from the Old Kingdom, consist of single enclosed halls with columns supporting the roof slabs.
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| 18. | They had four central piers supporting the roof slab, which allowed for the removal of the four blast walls after the war.
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| 19. | The earliest preserved ancient Egyptian temples, such as those at Giza, consist of single, enclosed halls with roof slabs supported by columns.
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| 20. | At the middle of the corridor, another trapezoidal roof slab, smaller than the first covers only the middle part of the corridor.
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