Various metal water system strengths and weaknesses of the material is what? Cailv advantages: low cost, easy to install, easy to maintain, rich color, coating life of up to 20 years. Disadvantages: The price is twice the Color, the intensity is half the color steel or copper, the thickness of the wall thickness of the words may be easily deformed Color advantages: the same thickness, color steel strength Cailv doubled the price is half; in particular, use more and more places in the snow Disadvantages: Color susceptible to corrosion of copper advantages: quality is very good, a long history of building Required; copper metallic luster can match most roofing materials and simple maintenance, no painting, easy life. rust, and environments; gutter material is currently the longest life Disadvantages: costly installation cut connection requires professional skills Why choose semicircle semicircle water system products is the classical style of architecture that can be used.? retro building, or high-grade building in what advantages and disadvantages of the water system is semi advantages:? suitable for Historic Preservation buildings or new construction, modern or classical style, beautiful and durable. Disadvantages: cost of materials and labor costs are generally higher than other forms of gutter sizes are determined based on the roof 1.5 K type catchment area for large building roof gutter. "K-type gutter is generally 5.6 to use the family home.." · semicircle general than K-type gutter gutter to be one inch, in order to ensure equal and K rainwater capacity. The larger the size of the corresponding gutters and eaves of the roof material ruggedness also more demanding, taking into account large slope roof rainwater may come out of the gutter, you can also increase accordingly gutter size. How to determine the size of the downspout? downspouts determined by the caliber of the roof catchment. 2 * 3 downspouts meet 60 square meters of roof catchment D, 3 * 4 of downspouts to meet 120 square roof catchment, downpipes 4 * 5, 200 square feet of roofing meet catchment; 5 inches K type of day Ditch usually equipped with downspouts 2 * 3; 3 * 4 downspouts less prone to clogging inside. Building Materials Co., Ltd. Hangzhou Ruichen