GETTING MY ระบบระบายน้ำฝน TO WORK

9. Suitable insulation is vital for the flat roof having a concrete drain, because it will help prevent freezing and prospective problems throughout colder months. Ample insulation will also support in selling good drainage by stopping water from freezing around the roof floor.รางน้ำฝนสังกะสี เป็นวัสด�