EXAMINE THIS REPORT ON ท่อน้ำฝน

Use wood stakes and Mason’s line or chalk line to produce a sq. or rectangular shape within the marked place. Ensure the formwork is level and protected. While constructing the formwork, make allowance for your slope towards the middle from the drain.เมื่อน้ำฝนหล่นกระทบกับหลังคา ก็อา