The Base material of steel building structure
1 . The waterproof material selected for roofing project shall conform to the following requirements. The drawings shall indicate the type, model and specification of the waterproof material, and its main physical properties shall conform to the provisions of this specification for the quality indexes of the material.
2 . When choosing roof waterproofing materials, coatings and joint sealing materials, the relevant contents of the design points in chapter 5, chapter 6 and chapter 8 of this specification shall be selected.
3. Considering maneuverability of environmental conditions and construction process, in the following cases, the material should be used by compatibility: waterproof material (coil, coating, similarly hereinafter) and primary treatment agent, waterproof materials and adhesives, waterproof materials and sealing materials, waterproofing materials and protective coating, two kinds of compound use waterproof material, first-line treatment and sealing materials.
4 . Choose waterproof material according to the property of the building and the function of the roof. It should meet the following requirements except for the exposed roof. Choose waterproof material with strong adhesion and uv resistance, thermal aging retention rate, acid rain resistance and excellent puncture performance. The roof should be made of waterproof material with good puncture resistance, mildew resistance and tensile strength. Water storage roof and planting roof should be made of waterproof material with excellent resistance to corrosion, mildew and puncture. Thin shell, prefabricated steel structure, steel building structure and other long-span building roof, should be selected light weight and heat resistance, good deformation adaptation waterproof material. Inverted roof, should be selected to adapt to the deformation of good, joint sealing guarantee rate of high waterproof material. Slope roof should be chosen with the base of strong adhesion, small temperature sensitivity waterproof material. Roof joint sealing waterproofing, should be selected with the base of strong adhesion, low temperature resistance, and a certain capacity to adapt to displacement of sealing materials.
5. Roof should be selected low water absorption, small density and thermal conductivity, and certain strength of insulation materials; The moisture content of the closed insulation layer can be determined by calculation according to the relative moisture content corresponding to the local annual average relative humidity and the mass water absorption rate of the material. Roofing project commonly used waterproof, heat insulation materials.