ABOUT ROOF DRAIN

หัวระบายน้ำฝน ใช้ท่อขนาดเล็กเพราะระบายน้ำฝนแบบเต็มท่อone. The first thing you need to look at when building a concrete drain with a flat roof would be the slope from the roof. A flat roof may not be totally flat, mainly because it normally featur