What was the single ASTM specification size previously recommended for aggregates in flood coats?

The single ASTM specification size that has been previously recommended for aggregates in flood coats is Number 7. This size is particularly relevant in built-up roofing systems because it provides an ideal balance of coverage and drainage properties. Number 7 aggregate has a nominal size that allows for adequate distribution across the flood coat, promoting proper adhesion and limiting the risk of ponding water, which can lead to roofing failures.

Using the appropriate aggregate size in flood coats is essential for ensuring the overall durability and performance of the roofing system. It aids in the efficient management of water runoff and helps maintain the integrity of the roof structure over time.