How ระบบระบายน้ำฝน can Save You Time, Stress, and Money.
Use wooden stakes and Mason’s line or chalk line to produce a square or rectangular shape around the marked location. Ensure the formwork is degree and secure. While making the formwork, make allowance for the slope to the middle from the drain.เมื่อน้ำฝนหล่นกระทบกับหลังคา ก็อาจก