First, the roof steel structure engineering design

A general rule, the roof project design should include the following information to determine grade and fortification roofing;

Structural design 2 roofing works;

3 waterproofing material of choice and its main physical properties;

4 thermal insulation material of choice and its main physical properties;

Sealing waterproofing 5 detailed structure of the roof, the choice of materials and their main physical properties;

6 roof drainage system design.

Roofing Waterproofing design should follow the "reasonable fortification, combined with anti-handling, according to local conditions, comprehensive treatment" principle. When Multiple Protective roofing can be web, film, fine stone waterproof concrete, tile and other composite materials, it can also be stacked using the web. When the roofing design using a variety of composite materials, anti-aging, puncture-resistant waterproof layer should be on the top, it should be a compatibility between adjacent materials.

Different heating in residential buildings and the need to meet the requirements of building summer heat, its roof systems should be the existing minimum transmission resistance "civil thermal design specifications" GB 50176, "Energy conservation design standard (heating residential buildings) "JGJ 26 and" hot summer and cold winter region residential building energy efficiency design standard "JGJ 134 OK.

Waterproofing roof construction details, such as gutter, gutters, Yang angle, fall-mouth, and other parts of Deformation additional layer should be set. Waterproof roofing project uses shall comply with environmental requirements.

Second, the material selection

1 roofing projects selected waterproof material shall meet the following requirements, drawings shall indicate varieties of waterproof material, type, size, and its main physical properties of the material shall comply with the specification requirements of quality indicators;

2 in the choice of roofing membranes, coatings and joint sealing materials shall chapter 5 of this specification, the relevant contents of Chapters 6 and 8 of the selected design elements;

3 Consider environmental conditions and construction process operability, in the following cases, the material used should be a Compatibility: waterproof material (referring membrane, paint, the same below) and primary treatment agent, waterproofing materials and adhesives, waterproofing materials and sealing materials, coating waterproof material and the protective layer, two waterproof composite materials used primary treatment agent and the sealing material.

4 Depending on the nature and function selection using the roof of the building waterproof material, shall comply with this Code shall also comply with the following requirements: Master roof exposed not used, should be used with the primary strong bond and resistance to ultraviolet light, heat aging retention , acid rain, excellent puncture resistance of waterproof material. Master roof, should be used puncture resistance, good mildew resistance and tensile strength of high waterproof material. Water roof, green roofs, should be corrosion-resistant, mildew resistance, puncture resistance, superior performance waterproof material. Shell, prefabricated structures, steel structures and other large span roofing, should use light weight and heat resistance, excellent ability to adapt to the deformation of waterproof material. Inverted roof, excellent ability to adapt to the deformation should be used, seal the seams ensure high waterproof material. Slope roof, should be used in strong bond with the grass roots, small temperature waterproof material. Roofing seams sealed waterproof, strong bond with the grass roots should be used, low temperature performance, and have a certain ability to adapt to the displacement of the sealing material.

5 roof should use low water absorption, density and thermal conductivity, and a certain strength of the insulation material; moisture enclosed insulation can water absorption according to the quality of local annual average relative humidity corresponding to the relative water content and the material , is determined by calculation. Common waterproof roofing project, insulation materials.