Fascination About ท่อน้ำฝน
Use wood stakes and Mason’s line or chalk line to create a square or rectangular condition across the marked area. Ensure that the formwork is amount and safe. Although building the formwork, make allowance to the slope toward the middle of your drain.รางน้ำฝนสังกะสี เป็นวัสดุที่ยอดฮ