EXAMINE THIS REPORT ON ท่อน้ำฝน

Use wooden stakes and Mason’s line or chalk line to produce a square or rectangular shape across the marked spot. Ensure that the formwork is amount and safe. Although developing the formwork, make allowance for your slope toward the center of the drain.รางน้ำฝนสังกะสี เป็นวัสดุที่ยอดฮ