THE BASIC PRINCIPLES OF ROOF DRAIN

หัวระบายน้ำฝน ใช้ท่อขนาดเล็กเพราะระบายน้ำฝนแบบเต็มท่อThe fundamental operate of a roof is to protect the building from The weather. As being the roof collects rain, the h2o have to be transported rapidly and safely and securely away by a drainage