It is not uncommon to see black stains on Roman clay tile roofs. These stains are usually formed due to the roof being exposed to the outside environment for a long time and being affected by a variety of natural factors. The main causes include mold, algae, air pollutants, etc.

● Starting at one end of the eaves, place the first tile on the waterproof membrane. ● Use a nail gun or hammer to secure the tiles to the wooden baseboard, fixing each tile at at least two points. ● Make sure the bottom edge of the tile is flush with the eaves, and use a level to check for straightness.

Assuming the loss rate is 5%: ● Loss number = 734×0.05=36.7 tiles ● Actual total number of tiles = 734+36.7=770.7 tiles Therefore, considering other factors such as loss, a 100 square meter roof will eventually require 771 Roman clay tiles (0.15 square meters per tile).