Everything about ระบบระบายน้ำฝน
Use wood stakes and Mason’s line or chalk line to create a sq. or rectangular shape round the marked spot. Make certain the formwork is stage and secure. Though making the formwork, make allowance for your slope in direction of the middle from the drain.เพื่อให้มั่นใจได้ว่าสามารถใช้งา