What is the rule regarding reinstallation of aggregate surfacing materials on a flat roof?

Reinstallation of aggregate surfacing materials on a flat roof is not permitted according to specific building codes and standards. When aggregate surfacing is disturbed, it compromises the integrity of the roofing system. The primary concern with reinstallation is that the original layers may not be adequately prepared or sealed, which can lead to issues such as water infiltration, reduced durability, and increased risk of failure of the roofing system.

Permitting reinstallation could lead to situations where layers become unbonded or where moisture is trapped, further exacerbating the potential for leaks and other roofing failures. Therefore, to maintain the integrity, durability, and performance of the roofing system, the prohibition against reinstallation serves to ensure proper installation practices and adherence to regulatory standards.

This emphasis on preventing reinstallation highlights the importance of proper initial application and long-term maintenance of flat roofing systems, ensuring the longevity and effectiveness of roof assemblies.