THE BASIC PRINCIPLES OF ท่อน้ำฝน

9. Correct insulation is vital to get a flat roof using a concrete drain, since it may also help avoid freezing and likely harm during colder months. Ample insulation may also help in selling right drainage by stopping drinking water from freezing within the roof floor.เพื่อให้มั่นใจได้ว่าสามารถ�