Influence roof drainage factor roof drainage how to design

With the advancement of science and technology, we need to carry out a thorough drainage design in order to eliminate roof rain quickly. Then what is the relationship between roof drainage? If you do roof drainage ? Let's take a look at it together.

Factors affecting roof slope

1, the relationship between roof waterproof material and drainage slope

If the waterproof material is of a smaller size, the seams are bound to be more and the gap leaks easily. Therefore, the roof should have a large drainage gradient so that the water in the house area can be quickly eliminated. If the waterproof material of the roof covers a large area and the joints are small and tight, the drainage slope of the roof can be smaller.

2. Relationship between rainfall size and slope

In regions with large rainfall, the possibility of roof leakage is greater, and the drainage slope of the roof should be appropriately increased; conversely, the roof drainage gradient should be smaller.

Roof drainage organization design

The main task of the roof drainage organization design is to divide the roof into a number of drainage areas and direct the rainwater to the rainwater pipe, so that the drainage line is simple, the rainwater port load is uniform, the drainage is smooth, and water leakage from the roof is avoided. Generally follow the steps below:

First, determine the number of drainage slopes (slope)

Under normal circumstances, when the width of the flat roof of the street-facing building is less than 12m, a single-slope drainage may be adopted; when the width of the building is more than 12m, double-slope drainage shall be adopted. Sloping roofs should be combined with single-slope, double-slope or quad-slope drainage in accordance with architectural requirements.

Second, divide the drainage area

The purpose of dividing the drainage area is to rationally arrange the downspouts. The area of ​​the drainage area refers to the area of ​​the horizontal projection of the roof, and the maximum area of ​​water collected from the roof of each downfall pipe should not exceed 200 m2. The distance between the gullies is 18~24m.

Third, determine the material used in the gutter and the profile and size of the gutter is the gutter on the roof, which is also called the gutter when it is located in the gutter mouth. The purpose of setting up the gutter is to collect roof rainwater and quickly remove roof rainwater systematically. Gutters vary according to the type of roof. Such as slope roof can be made of reinforced concrete, galvanized iron sheet, asbestos cement and other materials made of groove or triangular gutter. Flat roof gutters are generally made of reinforced concrete. When using a parapet draining scheme, inclined roofs and vertical walls can be used to form triangular gutters. When a guttering drainage scheme is adopted, a special trough is usually used. The board is made into a rectangular gutter

Fourth, determine the downspout specifications and spacing

According to different materials, the downfall pipe is made of cast iron, galvanized iron sheet, plastic, asbestos cement, clay, etc. Currently, cast iron and plastic drop pipes are widely used. Its diameters are 50mm, 75mm, 100mm, 125mm, 150mm, 200mm, and several specifications. General civil construction The most commonly used drop pipe diameter is 100mm, 50mm or 75mm downpipe can be used for small area terrace or balcony. The position of the downspout shall be at the solid wall surface, the distance between them shall be generally within 18m, and the maximum spacing shall not exceed 24m. Because the distance is too large, the longer the longitudinal slope surface of the groove, the thicker the material in the groove of the groove will be thickened. The amount of water in the gutter is reduced, causing rain to leak into the roof or gushing from the outside of the gutter.

Summary: All of the above information was given about roof drainage and I hope everyone can help.

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