| 21. | The slate roof is often considered the best type of roofing.
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| 22. | The concrete flat roofing around the domes is covered with asphalt.
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| 23. | The Campus Center also features an energy-efficient roofing structure.
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| 24. | Different shapes and roofing designs created the facade of the building.
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| 25. | The ancient trees roofing them are the survivors of Khandava Forest.
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| 26. | Then as now the predominant building and roofing material was stone.
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| 27. | The slate roofing tiles were recycled as mulch for the grounds.
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| 28. | An important use of Spanish slate is as a roofing material.
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| 29. | Sometimes roofing nails can be used to create unobtrusive spike marks.
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| 30. | The technique of making durable hardwood roofing shingles was also developed.
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